Manual de Instalación y Operación del Modulo LS-6 L-12

7/29/2019 Manual de Instalacin y Operacin del Modulo LS-6 L-12

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LS-6N, LS-126/12-Channel Low Speed Data Modules

Megaplex-2100/2104 Version 11, Megaplex-4100 Version 1.2

INSTALLATION

AND

OPERATIONMANUAL

The Access Company


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LS-6N, LS-126/12-Channel Low Speed Data Modules

Megaplex-2100/2104 Version 11, Megaplex-4100 Version 1.2

Installation and Operation Manual

Notice

This manual contains information that is proprietary to RAD Data Communications Ltd. ("RAD").No part of this publication may be reproduced in any form whatsoever without prior writtenapproval by RAD Data Communications.

Right, title and interest, all information, copyrights, patents, know-how, trade secrets and otherintellectual property or other proprietary rights relating to this manual and to the LS-6N, LS-12and any software components contained therein are proprietary products of RAD protectedunder international copyright law and shall be and remain solely with RAD.

LS-6N, LS-12 is a registered trademark of RAD. No right, license, or interest to such trademark isgranted hereunder, and you agree that no such right, license, or interest shall be asserted byyou with respect to such trademark.

You shall not copy, reverse compile or reverse assemble all or any portion of the Manual or theLS-6N, LS-12. You are prohibited from, and shall not, directly or indirectly, develop, market,distribute, license, or sell any product that supports substantially similar functionality as theLS-6N, LS-12, based on or derived in any way from the LS-6N, LS-12. Your undertaking in thisparagraph shall survive the termination of this Agreement.

This Agreement is effective upon your opening of the LS-6N, LS-12 package and shall continueuntil terminated. RAD may terminate this Agreement upon the breach by you of any term hereof.Upon such termination by RAD, you agree to return to RAD the LS-6N, LS-12 and all copies andportions thereof.

For further information contact RAD at the address below or contact your local distributor.

24 Raoul Wallenberg StreetTel Aviv 69719, Israel

Tel: 972-3-6458181Fax: 972-3-6498250, 6474436E-mail: [email protected]

900 Corporate DriveMahwah, NJ 07430, USA

Tel: (201) 5291100, Toll free: 1-800-4447234Fax: (201) 5295777E-mail: [email protected]

19882007 RAD Data Communications Ltd. Publication No. 764-229-11/07
mailto:[email protected]:[email protected]:[email protected]:[email protected]


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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Preliminary Preparation 1

Quick Start Guide

If you are familiar with the LS-6N, LS-12 modules, use this guide to prepare it for

operation.

1. Preliminary Preparation

Choose the interface mode of each external user channel: DTE or DCE by setting

the interface module switches, as shown in the figure below for LS-12.

SW1 SW13

SW2 SW14

SW3 SW15

SW4 SW16

SW5 SW17

SW6 SW18

SW7 SW19

SW8 SW20

SW9 SW21

Interface Mode

Selection

DCE

DTE

DTE

DCE

Channel 1

Channel 2

Channel 12

.

.

.

.

.

.

.

.

.

.

.

.

.SW12 SW24

SW10 SW22

SW11 SW23


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Quick Start Guide Installation and Operation Manual

2 Configuring the LS-6N, LS-12 Modules LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

2. Installing the LS-6N, LS-12 Modules

1. Insert the module in the assigned I/O slot of the Megaplex enclosure.

2. Connect the user equipment to the module interface SCSI connectors.

3. Configuring the LS-6N, LS-12 Modules

MP-2100/2104 Chassis

Enter the command DEF CH SS * < >. The configuration parameters and

the allowed range of values are listed below.

Internal Port Parameters

Connect YES

Rate 32, 56, , 128, 192, 256, 384, 512

768 kbps (LS-12 only)

Operation Mode

UNI-BRD TX

UNI-BRD RX

Tandem Mode Future option, the only available value is .

ML Slot up to the maximum supported by the chassis

ML Channel* up to the maximum supported by the selected main

link module

External Port Parameters

Connect YES

Format ASYNC

Rate : 2.4, 4.8, , 19.2, 38.4

: 7.2, 14.4, 28.8, 57.6

: 8.0, 16.0, 24.0, 32.0, 48.0, 56.0, 64.0

Clock Mode

EXTERNAL

DTE


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Installation and Operation Manual Quick Start Guide

LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Configuring the LS-6N, LS-12 Modules 3

Control Sig

RTS

DTR&RTS

CTS

RTS

Data Bits

9

8

7

6

Total number of data and parity bits

Int

IN2 (for LS-12 only)

MP-4100 chassis

Configure the LS-6N, LS-12 internal port parameters, using the

screen.

The configuration parameters and the allowed range of values are listed below.

Internal Port Parameters

Admin Status Up

Rate 32, 56, , 128, 192, 256, 384, 512

768 kbps (LS-12 only)

Operation Mode

UNI-BRD TX

UNI-BRD RX

Tandem Mode Future option, the only available value is .

Destination Slot to IO-10

Destination Port 1 to 8 for external ports

1 to 63 (1 to 84) for internal (virtual) PDH ports

Configure the LS-6N, LS-12 external port parameters using the

screen.


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Quick Start Guide Installation and Operation Manual

4 Assigning Timeslots LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

External Port Parameters

Admin Status Up

Format ASYNC

Rate : 2.4, 4.8, , 19.2, 38.4

: 7.2, 14.4, 28.8, 57.6

: 8.0, 16.0, 24.0, 32.0, 48.0, 56.0, 64.0

Clock Mode

EXTERNAL

DTE

Control Sig

RTSDTR&RTS

CTS

RTS

Data Bits

9

8

7

6


In Port

IN2 (for LS-12 only)

4. Assigning Timeslots

Assign the required timeslot to each connected internal port.

When using the or mode in the module installed in the

MP-2100/2104 chassis, use the command to assign timeslots, and

the to assign a fraction of a timeslot if needed.

When using the mode in the module installed in the

MP-2100/2104 chassis, timeslot assignment for the receive direction is made

using the dedicated routing fields of the command.

For the module installed in the MP-4100 chassis, always use the

screen.


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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 i

Contents

1.1 Overview....................................................................................................................1-1

Applications............................................................................................................1-11.2 Physical Description ...................................................................................................1-21.3 Functional Description................................................................................................1-3

Purpose and Main Features.....................................................................................1-3Data Channel Characteristics...................................................................................1-4

Channel Rates....................................................................................................1-4Synchronous Data Channel Timing Modes...........................................................1-5Asynchronous Channel Characteristics ................................................................1-6Support of Interface Control Signals ...................................................................1-6

Diagnostics.............................................................................................................1-7Composite Data Stream Test and Loopback Functions ........................................1-7Data Channel Test and Loopback Functions ........................................................1-7

1.4 System Application Considerations.............................................................................1-8Routing to the Composite Channels ........................................................................1-8Bandwidth Allocation..............................................................................................1-9

Numerical Example ...........................................................................................1-111.5 Technical Specifications............................................................................................1-12

2.1 Introduction...............................................................................................................2-12.2 Setting the Internal Jumpers and Switches..................................................................2-12.3 Installing the Module in the Chassis............................................................................2-22.4 Connecting the Cables................................................................................................2-2

3.1 Overview....................................................................................................................3-13.2 Configuration Sequence for the MP-2100/2104 Chassis..............................................3-13.3 Configuration Sequence for the MP-4100 Chassis.......................................................3-23.4 Configuration Parameters...........................................................................................3-23.5 Assigning Timeslots....................................................................................................3-63.6 Displaying Status and Configuration Information ........................................................3-7


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Table of Contents Installation and Operation Manual

ii LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

4.1 Test and Diagnostic Functions....................................................................................4-1

Composite Data Stream Loopback Functions ...........................................................4-1Composite Data Stream Remote Digital Loopback...............................................4-2

Data Channel Stream Loopback Functions ...............................................................4-4Data Channel Local Digital Loopback...................................................................4-4

Data Channel Remote Digital Loopback...............................................................4-5BER Testing on Data Channels ............................................................................4-5

Recommended Test Sequence.................................................................................4-64.2 Frequently Asked Questions.......................................................................................4-64.3 Technical Support ......................................................................................................4-7


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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Overview 1-1

Chapter 1

Introduction

1.1 Overview

The LS-6N and LS-12 are data sub-multiplexer modules for use in Megaplex-2100,

Megaplex-2104, and Megaplex-4100 integrated access multiplexers. The modules

occupy one enclosure slot and provide six/twelve synchronous or asynchronous

data channels with ITU-T Rec. V.24/EIA RS-232 interfaces that can operate at

user-selectable data rates in the range of 2.4 to 64 kbps.

In this manual, the generic term is used when the information isapplicable all multiplexer versions. The complete designation is used only for

information applicable to a specific version.

Applications

Figure 1-1 shows a typical point-to-point application for a Megaplex system

equipped with LS-6N modules. In this application, the LS-6N modules connect a

group of remotely-located terminals to the central corporate computing

resources (a minicomputer or mainframe with communication front end).

E1/T1Network

MP-2100MP-2100

Minicomputeror

Mainframe

14.4 to512 kbps

14.4 to512 kbps

6 data channels(2.4 to 64 kbps)

6 data channels(2.4 to 64 kbps)

CBL-LS12octopus

cable

ML-T1ML-T1LS-6N LS-6N

Figure 1-1. Typical LS-6N Point-to-Point Application

Figure 1-2shows an application where LS-6N is used by Megaplex-2100 toconnect low speed data traffic such as data terminals, surveillance cameras, and

train track signaling equipment, over T1 TDM lines. In this combined TDM/IP

application, LS-6N is employed, together with HS-6N modules, for high speed

data channels, ML-IP modules for analog voice channels, and ML-2T1 modules for

digital voice channels. All data traffic is over a T1 line, while analog telephone and

digital PBX voice traffic is over IP. This is achieved using a single device,

Megaplex-2100.

Note


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Chapter 1 Introduction Installation and Operation Manual

1-2 Physical Description LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

IP Network

T1 Network

T1

MP-2100

PBX

VC-8ML-IP

ML-2T1

HS-QN

ML-2T1

A.T.O.system

(Automatic TrainOperation)

Lowspeeddata

Surveillancecamera

TerminalWork Clock

Server

Scheduleinformation

High speed data

Analog voiceVo

ice Vo

ice

Data D

ata

Digital voice

LS-6N

12:45

64 kbps

2.4 kbps

n x 56, 64 kbps

9.6 kbps

4.8 kbps

NetworkManagementSystem

T1

MP-2100

PBX

VC-8

ML-IP

ML-2T1

HS-QN

ML-2T1

A.T.O.system

(Automatic TrainOperation)

Lowspeeddata

Surveillancecamera

TerminalWork Clock

Server

Scheduleinformation

High speed data

Analog voice

Digital voice

LS-6N

12:45

64 kbps

2.4 kbps

n x 56, 64 kbps

9.6 kbps

4.8 kbps

Figure 1-2. Connecting Low Speed Data Traffic over T1 TDM Lines with Line

Protection over IP Network

The module data channels have standard EIA RS-232/ ITU-T Rec. V.24 interfaces.

The interface type, DCE or DTE, is user-selectable by means of internal switches,

separately for each channel.

1.2 Physical Description

Typical panel of the LS-6N and LS-12 modules is shown in Figure 1-3and

Figure 1-4, respectively. The LS-6N panel includes one 68-pin female SCSI

connectors designated CH.1-6, for connection to the data channels. The LS-12

panel includes two such connectors designated CH.1-6 and CH.7-12. Connector

pin assignments and functions are given in Appendix A.


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Installation and Operation Manual Chapter 1 Introduction

LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Functional Description 1-3

LS-6N

CH.1-6

S. LOSS

Sync LossIndicator

ChannelConnector

LS-12

CH.

1-6

CH.7-12

S. LOSS

A B

S. LOSS B

Indicator

S. LOSS A

Indicator

CH.1-6

Connector

CH.7-12

Connector

Figure 1-3. LS-6N Panel Figure 1-4. LS-12 Panel

In addition, the module panels include alarm indicators. LS-12 has two alarm

indicators, designated S.LOSS A and B. Each indicator lights in case the

synchronization machine serving the corresponding composite channel, loses

synchronization to the incoming signal. LS-6N has only one indicator, designated

S.LOSS. During normal operation, the indicators are off.

1.3 Functional Description

Purpose and Main Features

The LS-6N and LS-12 modules are used to achieve highly efficient utilization of

the uplink bandwidth for low-speed transfer applications, by dividing the uplink

bandwidth into smaller units with very little overhead.

The uplink bandwidth required by one LS-6N or LS-12 module depends on thetotal channel data payload: the available selections are 14.4 kbps (quarter

timeslot), 32 kbps (half timeslot), 56 or 64 kbps (one timeslot), 128 kbps (two

timeslots), 192 kbps (three timeslots), 256 kbps (four timeslots), 384 kbps (six

timeslots), and 512 kbps (eight timeslots) and 768 kbps (twelve timeslots). The

uplink timeslots used by the LS-6N, LS-12 modules are user-selectable.

For flexibility, the LS-6N module is equipped with a single internal port, which is

used to form a composite data stream. All six external (user) ports are routed to

this internal port. The internal port can be routed to either of the Megaplex uplink

ports.


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1-4 Functional Description LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

The LS-12 module is equipped with two internal ports, which can be used to form

two composite data streams. Each internal port can be routed to either of the

Megaplex uplink ports. External (user) ports can be routed to either of the two

internal ports (see details in the section below).

Data Channel Characteristics

The data channels have standard EIA RS-232/ ITU-T Rec. V.24 interfaces. The

interface type, DCE or DTE, is user-selectable by means of the interface module

internal switches, separately for each channel.

Each module channel can be configured for either synchronous or asynchronous

operation, with the asynchronous-to-synchronous conversion being made in

accordance with ITU-T Rec. V.14. The timing mode of channels configured for

operation in the synchronous mode is selectable.

Within the LS-6N module, channels are processed in three pairs: 1 and 2, 3 and 4,

5 and 6. Within the LS-12 module, channels are processed in six pairs: 1 and 2, 3

and 4, 5 and 6, 7 and 8, 9 and 10, 11 and 12.

Each pair of the external user channel must be routed to the same internal

composite channel, the user channels must also operate at the data rates

belonging to the same rate group and support the end-to-end transmission of

the matching control signals as explained in the following sections.

Each group of six data channels terminates on a single SCSI 68-pin female

connector, which enables connection of the LS-6N, LS-12 data channels to a

distribution frame. RAD also offers a special octopus cable, which ends in six

25-pin D-type male or female connectors, which enables the connection of each

channel directly to the users equipment.

The data rates and other operating parameters of the LS-6N, LS-12 data

channels are configured by means of the system management.

Channel Rates

Each channel supports three groups of data rates:

all the standard rates in the range of 2.4 to 38.4 kbps (except the

rates defined as belonging to Group 2 and Group 3), in either the

synchronous or asynchronous mode.

: 7.2, 14.4, 28.8 and 57.6 kbps, in either the synchronous or

asynchronous mode.

8, 16, 24, 32, 48, 56, and 64 kbps in the synchronous mode only.Channel rates can be freely selected, as long as both channels of a given pair operate

at rates taken from the same group. Channel data rates as well as all the channel

operating parameters are controlled by means of the system management.

Note


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Synchronous Data Channel Timing Modes

LS-6N, LS-12 channels configured for operation in the synchronous mode have

user-selectable timing modes, which can be independently selected for each

channel. Together with a set of internal channel buffers, these timing modes

permit connection to various types of digital lines, including digital data services,

and ensure data integrity.

The timing modes are as follows:

: when this timing mode is selected, the LS-6N/12 channel provides the

timing (transmit and receive clock signals) to the users equipment connected

to it. These clock signals are derived from the Megaplex nodal clock.

The DCE timing mode is intended for use when equipment with a DTE

interface is connected to the LS-6N/12 channel. To use this mode, the

interface of the LS-12 channel must be set to DCE (via the SW switch of the

relative channel).

the LS-6N/12 channel provides the receive timing signal

(derived from the Megaplex nodal clock) to the equipment connected to the

channel, and accepts the transmit timing from the connected equipment. In

this case, the LS-6N/12 channel internally buffers and retimes the transmit

data in accordance with the Megaplex nodal clock. Note that in order to avoid

clock slips, the transmit timing should be locked to the receive timing.

The external DCE timing mode is intended for use when the LS-6N/12 channel

is connected to equipment with DCE interface in a tail-end circuit. To use this

timing mode, the interface of the LS-6N/12 channel must be set to DTE (via

the SW switch of the relative channel).

the LS-6N/12 channel requires receive and transmit timing signals from

the equipment connected to the channel. To use this timing mode, the

interface of the LS-6N/12 channel must be set to DTE (via the SW switch of

the relative channel).

One of the LS-6N/12 channels operating in the DTE timing mode can be

selected as the reference timing source for the Megaplex nodal timing,

provided the channel data rate is a multiple of 8 kbps (8, 16, 24, 32, 48, 56,

or 64 kbps). In this case, the Megaplex system will actually use the transmit

clock of the selected LS-12 channel as long as the channel RTS line is active.

The DTE mode is mainly intended for use when the LS-6N/12 channel is

connected to equipment with DCE interface, which is used to provide the

timing reference for the Megaplex system (e.g., when the LS-6N/12 channel

is connected to a data network, or to a channel of a higher-level multiplexer).

The DTE mode can be also used when the equipment connected to thechannel uses timing derived from the same source used to provide the

Megaplex nodal clock reference.


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1-6 Functional Description LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

Asynchronous Channel CharacteristicsThe timing mode of asynchronous channels is always DCE, i.e., the channel data

rates are derived from the Megaplex nodal timing.

For channels operating in the asynchronous mode, the number of data bits in the

word is user-programmable: 6, 7, 8, or 9. When parity is used, the total number

of bits to be taken into account includes the parity bit, because the parity bit is

transparently transferred.

In addition to the selected number of data bits, the word format includes one

start bit and one stop bit.

Support of Interface Control SignalsThe LS-6N, LS-12 modules provide two user-selectable modes of support for the

V.24/RS-232 interface control signals of its data channels:

This mode can be independently selected for

each channel. When local support is enabled, the channel locally supports five

interface control signals, that is, the state of the control signals is not

transmitted to the remote channel. The locally-supported control signals areas follows:

DTR: this is an input signal for channels with DCE interface, and an output

signal, always ON, for channels with DTE interface.

RTS: this is an input signal for channels with DCE interface, and an output

signal for channels with DTE interface.

CTS: this is an output signal for channels with DCE interface, and an input


For channels with DCE interface, the user can select between

permanently asserting the CTS line (CTS line always ON), and making the

CTS line follow the state of the RTS line.

DSR: this is an output signal for channels with DCE interface, and an input


For channels with DCE interface, the DSR line is constantly ON, except

when the link serving the internal port to which the channel is connected,

is down because of loss of frame synchronization.

DCD: this is an output signal for channels with DCE interface, and an

input signal for channels with DTE interface.

For channels with DCE interface, the DCD line is constantly ON, except

when the link serving the internal port to which the channel is connected,

is down because of loss of frame synchronization.

This capability is used when it is

necessary to transmit the state of the interface control signals, which control

the channel data flow through the Megaplex link, e.g., for applications which

require hardware flow control. To minimize bandwidth requirements, two

selections are available:

End-to-end transmission of local RTS line state to the remote DCD line,

and vice versa. Note that this mode is relevant only when the two

channels are configured with DCE interfaces.


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End-to-end transmission of local RTS line state to the remote DCD line,

and local DTR line to the remote DSR line, and vice versa. Note that this

mode is relevant only when a channel configured with DCE interface is

connected to a remote channel with DTE interface.

The end-to-end transmission mode can be independently selected for each

channel. However, when both channels of a given pair are configured for

end-to-end transmission, both must be configured to transmit the samenumber of control signals, i.e., you cannot configure one channel to transmit

one control signal (i.e., RTS to DCD) end-to-end, and the other channel - two

control signals (RTS and DTR). Typical end-to-end delay is 2.5 msec.

Diagnostics

The LS-6N, LS-12 modules automatically perform self-diagnostics upon power-up.

In addition, the modules include powerful testing capabilities which help reduce

downtime to a minimum.

The test and loopback functions are available at two levels:

Composite data streams generated by the module (the data streams sent tothe uplink).

Individual data channels.

These functions are controlled by means of the Megaplex system management.

Composite Data Stream Test and Loopback Functions

The module supports the following test and loopback functions on each

composite data stream:

Local digital loopback.

Remote digital loopback.

Data Channel Test and Loopback Functions

The module supports the following test and loopback functions on the individual

user data channels:

Local digital loopback.

Remote digital loopback.

Bit error rate testing (BERT) on the selected channel.


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1-8 System Application Considerations LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

1.4 System Application Considerations

Routing to the Composite Channels

The LS-6N module has a single internal port, which connects the composite data

stream of the module to the TDM buses. The LS-12 module has two internalports, which connect the composite data stream(s) of the module to the TDM

buses. The functionality of the two ports can be independently controlled:

External (user) ports can be routed to either of the two internal ports. The

only restriction is that the two ports of a pair are always routed together, to

the same internal port. Therefore, all the twelve user ports can be routed to

the same internal port.

Each internal port can routed to either of the Megaplex uplink ports.

The LS-6N module has a single internal port, which connects the composite data

stream of the module to the TDM buses. The internal port can be routed to any

Megaplex TDM bus or uplink.

Each internal port can use the following uplink bandwidths:

14.4 kbps, requires the allocation of quarter E1/T1 timeslot.

32 kbps, requires the allocation of half E1/T1 timeslot.

56 kbps, requires the allocation of one E1/T1 timeslot.

64 kbps, requires the allocation of one E1/T1 timeslot.

128 kbps, requires the allocation of two E1/T1 timeslots.

192 kbps, requires the allocation of three E1/T1 timeslots.

256 kbps, requires the allocation of four E1/T1 timeslots.

384 kbps, requires the allocation of six E1/T1 timeslots.

512 kbps, requires the allocation of eight E1/T1 timeslots.

768 kbps, requires the allocation of twelve E1/T1 timeslots.

The selection of the optimal E1/T1 bandwidth depends on the total users

payload rate, as is explained in the following section.

Timeslots can be freely allocated to each internal port, in accordance with the

standard timeslot allocation rules (e.g., timeslots allocated to one internal port

must not overlap timeslots allocated to the other port, or any other module in

the Megaplex unit).

The timeslots allocated to each internal port must always be handled as a bundle(a single block of timeslots) with respect to the routing within the transmission

network. Splitting the bundle may affect the order of reception of the individual

bits at the remote location, and therefore may prevent the operation of the

LS-6N/12 link by disrupting the exchange of housekeeping and synchronization

information contained in the composite data stream.


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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 System Application Considerations 1-9

Bandwidth Allocation

The Megaplex uplink bandwidth assigned to an LS-6N, LS-12 composite data

stream (internal port) must be internally allocated to the individual user channels

routed to that port, and to the housekeeping information required for proper

transmission and reception of each composite data stream.

Each composite channel data stream carries two basic types of information: Users data, consisting of:

External channels payload data.

External channels end-to-end signaling.

Composite channel housekeeping data, consisting of:

Frame synchronization data for the link between the two module ports.

Inband management channel.

The technique used to manage the composite channel bandwidth is permanent

on-demand allocation. This means that within the module, bandwidth is

permanently allocated to the external channels connected to a compositechannel, in accordance with each external channel data rate and the end-to-end

signaling requirements. The internal bandwidth is automatically reallocated when

a change occurs in the number of users channels connected to a composite

channel.

The bandwidth that must be assigned to a composite channel on the

corresponding Megaplex TDM bus (i.e., E1/T1 card) must be equal to, or greater

than, the total bandwidth needed for carrying the various types of information

listed above.

Bandwidth allocation is performed by organizing the composite data stream in

frames. Each bit in a frame can be independently allocated, and therefore it

serves as the bandwidth allocation unit. Therefore, the total number ofbandwidth allocation units equals the frame length, in bits.

As a result, the frame length and the information-carrying capacity (in kbps) of

an allocation unit vary with the uplink bandwidth assigned to an LS-6N, LS-12

composite channel, as listed in Table 1-1.


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1-10 System Application Considerations LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

Table 1-1. Composite Channel Multiplexing Data

Assigned Bandwidth Composite

Frame Length

Bandwidth

Allocation Unit

Bandwidth Available to

Users Payload

14.4 kbps 40 bits 0.4 kbps 12.8 kbps (36 units)

32 kbps 80 bits 0.4 kbps 31.2 kbps (78 units)








768 kbps (LS-12 only) 240 bits 3.2 kbps 761.6 kbps (238 units)

Table 1-2provides detailed bandwidth allocation information for each supported

channel data rate, as a function of assigned bandwidth. Note that the supported

channel rates depend on the assigned bandwidth.


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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 System Application Considerations 1-11

Table 1-2. Bandwidth Allocations

Use Allocation Units Allocation Rule

Synchroniza-

tion

1

Inband

management

1

Data

Channels

Channel

Rate

(kbps)

Composite Channel Rate (kbps) In accordance with channel data

rate.

14.4 32 56, 64,

128, 192

256,

384

512, 768 Theoretical minimum is one

allocation unit per active

channel, however for low data

2.4

4.8

7.2

8

9.6

14.4

16

19.2

24

28.8

32

38.4

48

56

57.6

64

6

12

18

20

24

6

12

18

20

24

36

40

48

60

72

3

6

9

10

12

18

20

24

30

36

40

48

60

70

72

80

3

3

N/A

5

6

9

10

12

15

18

20

24

30

35

36

40

3

3

N/A

N/A

3

N/A

5

6

N/A

9

10

12

15

N/A

18

20

rate (i.e., for data rates lower

than the bandwidth allocation

unit), oversampling is used to

achieve an integer number of bitsamples: e.g., when the

bandwidth allocation unit is

3.2 kbps and the channel data

rate is 2.4 kbps, the effective

bandwidth being used is 3 times

higher, 9.6 kbps. 9.6 kbps

translate to 3 allocation units.

Therefore, the effect of

oversampling is to increase the

bandwidth used to transfer

low-rate channels.

64 kbps rate is available only for

uplink rates of 128 kbps and

higher

Channel

end-to-end

control

signals

1 allocation unit for each pair of channels (1 allocation

unit can carry up to four control signals, e.g., two

signals for each channel)

For each data channel that

requires end-to-end signaling

Numerical Example

The following two numerical examples illustrate how to use the above table

information from to calculate the internal channel bandwidth required for variousoperating configurations.

In the first example (see Table 1-3), all the six channels of an LS-6N module are

used, and are connected to the composite channel. In the second example (see

Table 1-4), all the 12 channels of an LS-12 module are used, and are connected

to one composite channel. In both cases, the Megaplex uplink bandwidth

assigned to the composite channel is 256 kbps (160 bits).


22/54


1-12 Technical Specifications LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

Table 1-3. Bandwidth Allocations Example, LS-6N

Utilization Allocation Units

4 data channels with 14.4 kbps per channel; these

channels (distributed among two channel pairs) require

end-to-end signaling

36 units

2 units signaling

2 data channels with 32 kbps per channel, no end-to-end

signaling

40 units

Total user allocation 78 units

Frame synchronization and management channel 2 units

Total capacity used 80 units

Reserve capacity

[composite channelassigned bandwidth of 256 kbps less

total capacity used]

80 units (128 kbps)

[160 units - 80 units =

80 units]

Table 1-4. Bandwidth Allocations Example, LS-12

Utilization Allocation Units

10 data channels with 14.4 kbps per channel; seven of

these channels (distributed among four channel pairs)

require end-to-end signaling

90 units

4 units signaling

2 data channels with 32 kbps per channel, no end-to-end

signaling

40 units

Total user allocation 134 units

Frame synchronization and management channel 2 units

Total capacity used 136 units

Reserve capacity 24 units (38.4 kbps)

1.5 Technical Specifications

Number of User

Channels (ExternalPorts)

6/12 channels, processed as 6/12 pairs (1 and 2, 3 and

4, 5 and 6, 7 and 8, 9 and 10, 11 and 12)

Number of

Composite Channels

(Internal Ports)

LS-6N: One, routable to either of the Megaplex uplink

ports

LS-12: Two, each independently routable to either of

the Megaplex uplink ports

Uplink Bandwidth 14.4 kbps (quarter timeslot)


23/54


LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Technical Specifications 1-13

Requirements 32 kbps (half timeslot)

56 kbps (one timeslot)


128 kbps (two timeslots)

192 kbps (three timeslots)

256 kbps (four timeslots)

384 kbps (six timeslots)

512 kbps (eight timeslots)

768 kbps (twelve timeslots)

Channel Multiplexing

Technique

Each pair of external channels can be independently

connected to each internal port

Configuration Programmable via system management

Data ChannelInterface Type

ITU-T Rec. V.24/EIA RS-232, user-selectable DCE or DTEinterface

Operation Mode Synchronous or asynchronous, user-selectable

Async-to-Sync

Conversion Method

Compatible with ITU-T Rec. V.14

Synchronous

Operation Timing

Modes

DCE (for direct connection to DTE)

External DCE (for direct connection to DCE in the

tail-end mode)

DTE (for direct connection to DCE)

Asynchronous Word

Parameters

Number of Data

and Parity Bits

Total of 6, 7, 8 or 9, user-selectable

Parity Bit Transparently transferred

Stop Bits 1

Data ChannelConnectors One SCSI 68-pin female connector for each group of sixchannels

Data Rates Independently selectable for each channel, except that

the two channels of one pair must use rates from the

same group

Group 1 2400, 4800, 9600, 19200 and 38400 bps in either

synchronous or asynchronous mode


24/54


1-14 Technical Specifications LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

Group 2 7.2, 14.4, 28.8, and 57.6 kbps in either synchronous or

asynchronous mode

Group 3 8, 16, 24, 32, 48, 56, and 64 kbps in synchronous mode

only

Control Signals Support mode is user-selectable for each channel

Local Support RTS, CTS, DSR, DCD, DTR

End-to-End

Transfer

Selectable:

RTS-to-DCD (2.5 msec typical delay)

RTS-to-DCD and DTR-to-DSR (2.5 msec typical delay)

Composite Data

Streams

Local digital loopback on the selected composite data

stream

Remote digital loopback on the selected composite

data stream

Data Channels Local digital loopback

Remote digital loopback

Bit error rate testing (BERT) on the selected channel


25/54

LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Setting the Internal Jumpers and Switches 2-1

Chapter 2

Installation and Operation

2.1 Introduction

This chapter provides installation, configuration and operation instructions for

the LS-6N and LS-12 modules. The information presented in this chapter

supplements the general installation, configuration and operation instructions

contained in the corresponding Megaplex Installation and Operation Manual.

Before performing any internal settings, adjustment, maintenance, or repairs,

first disconnect all the cables from the module, and then remove the modulefrom the Megaplex enclosure.

No internal settings, adjustment, maintenance, and repairs may be performed by

either the operator or the user; such activities may be performed only by a skilled

technician who is aware of the hazards involved.

Always observe standard safety precautions during installation, operation, and

maintenance of this product.

The modules contain components sensitive to electrostatic discharge (ESD). To

prevent ESD damage, always hold the module by its sides, and do not touch the

module components or connectors.

2.2 Setting the Internal Jumpers and Switches

The operating mode of the LS-6N, LS-12 modules is controlled by software.

In addition, the modules have switches that select the interface mode of each

channel: DTE or DCE. Default setting is DCE.

When selecting the data channel timing reference, observe the following DTE/DCE

switch settings:

DCE clock mode: the DTE/DCE switch is set to DCE. DTE or External DCE clock mode: the DTE/DCE switch is set to DTE.

Refer toTable 3-2for details on the external port configuration parameters.

Figure 2-1 shows the construction of the LS-12 modules, and identifies the

location of these switches (12 switches, one for each channel). The LS-6N

module differs only in that it contains 6 channels.

Before installing a module in the Megaplex enclosure, check the settings of these

switches. If the current settings of these switches meet your system

requirements, skip this section and proceed with the module installation in the

Warning

Caution

Note


26/54

Chapter 2 Installation and Operation Installation and Operation Manual

2-2 Connecting the Cables LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

Megaplex enclosure, as explained below; otherwise, change the switch settings as

required.

SW1 SW13

SW2 SW14

SW3 SW15

SW4 SW16

SW5 SW17

SW6 SW18

SW7 SW19

SW8 SW20

SW9 SW21

Interface Mode

Selection

DCE

DTE

DTE

DCE

Channel 1

Channel 2

Channel 12

.

.

.

.

.

.

.

.

.

.

.

.

.SW12 SW24

SW10 SW22

SW11 SW23

Figure 2-1. Module LS-12, Internal Settings

2.3 Installing the Module in the Chassis

Refer to the system installation plan, and insert the module in the assigned I/O

slot of the Megaplex enclosure.

2.4 Connecting the Cables

For direct connection to users data equipment, RAD offers ready-made octopus

cables, CBL-LS12, having a length of 2m. These cables end in six 25-pin D-type

male connectors that can be directly connected to DTE's.

Connect one cable end to the module connectors, designated

CH.1-6 and CH.7-12, respectively, and the other end straight to the DTE

equipment.

Appendix A lists the pin assignment both of the module connector and the

CBL-LS12 cable.


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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2Configuration Sequence for the MP-2100/2104

Chassis 3-1

Chapter 3

Configuration

3.1 Overview

This chapter describes configuration parameters specific for LS-6N, LS-12

modules installed in the Megaplex-2100 or Megaplex-4100 chassis. For general

instructions and additional configuration procedures, refer to

Megaplex-2100/2104 Installation and Operation Manualand Megaplex-4100

Installation and Operation Manual, respectively.

The module is configured by the management system used to control the

Megaplex unit:

Supervision terminal or Telnet refer to the Megaplex-2100/2104or

Megaplex-4100 Installation and Operation Manualfor instructions.

Web browser refer to the Megaplex-4100 Installation and Operation Manual

for instructions.

RADview network management system refer to the RADview User's Manual

for instructions.

3.2 Configuration Sequence for the MP-2100/2104Chassis

Add an LS-6N, LS-12 module not yet installed in the Megaplex-2100/2104

chassis to the database. This allows preconfiguring the module parameters,

so that the module will immediately start operating in the desired mode as

soon as it is installed in the enclosure. For the supervision terminal, use the

DEF SYS command

Configure the LS-6N, LS-12 internal and external port parameters:

To define the parameters of all the module ports for the supervision

terminal, type the command:

DEF CH SS *

To define the parameters of an internal port, type the command:

DEF CH SS IN1 or DEF CH SS IN2

For the parameter description, see Table 3-1.


28/54

Chapter 3 Configuration Installation and Operation Manual

3-2 LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

To define the parameters of an external port, type the command:

DEF CH SS CC

where SS is the slot number, and CC is the channel number (1 to 6 for LS-6N

and 1 to 12 for LS-12). For the parameter description, see Table 3-2.

3.3 Configuration Sequence for the MP-4100

Chassis

1. Add an LS-6N, LS-12 module not yet installed in the Megaplex-4100 chassis

to the database. This allows preconfiguring the module parameters, so that

the module will immediately start operating in the desired mode as soon as it

is installed in the enclosure.

For the supervision terminal, use the

screen.

Configure the CL.1 or M8E1/M8T1/M8SL module port parameters (depending

on the LS-6N, LS-12 module application). For the configuration procedure,

refer to the appropriate Installation and Operation Manual.

Configure the LS-6N, LS-12 internal port parameters. For the supervision

terminal, use the screen.

Configure the LS-6N, LS-12 external port parameters. For the supervision

terminal, use the screen.

When necessary, modify the system timing reference to use the receive clock

of a LS-6N, LS-12 port as timing reference. For the supervision terminal, use

the screen (for instructions, refer to theMegaplex-4100 Installation and Operation Manual).

Configure the rate of each module port, using the

screen.

Make sure to plan ahead the configuration sequence, because Megaplex-4100

databases can be updated only after correctly completing the configuration

activities: any sanity error will prevent saving the changes to the database being

modified.

3.4 Configuration Parameters

The LS-6N, LS-12 modules have two groups of configuration parameters:

Internal port parameters, used to define the characteristics of composite

channels. These parameters are listed in Table 3-1.

External port parameters, used to define the data channel parameters. These

parameters are listed in Table 3-2.

Note


29/54

Installation and Operation Manual Chapter 3 Configuration

LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 3-3

For system application considerations and background information regarding the

selection of configuration parameters, refer to Chapter 1.Table 3-1 explains the internal port parameters and their range of values.

Table 3-2explains the external port parameters and their range of values.

Table 3-1. Internal Port Parameters

Parameter Description

(MP-2100/2104 only)

Determines whether the corresponding composite channel is connected to the

main link:

Composite channel is connected to the main link selected by means of

the field.Composite channel is disconnected. You can still program the desired

parameters, so the composite channel will be ready to operate when

needed

(MP-4100 only)

Used to enable/disable the flow of traffic through the selected port

The flow of traffic is enabled.

The flow of traffic is disabled. This state should be selected as long as

the port configuration has not yet been completed, or when it is

necessary to stop traffic flow through the port.

Specifies the bandwidth allocated to the corresponding composite channel on the

Megaplex uplink selected by means of the field:

14.4 kbps (quarter timeslot)

32 kbps (half timeslot)


64 kbps (one timeslot) 128 kbps (two timeslots)

192 kbps (three timeslots)

256 kbps (four timeslots)

384 kbps (six timeslots)

512 kbps (eight timeslots)

768 kbps (twelve timeslots)

Future option, the only available value is .

Selects the operation mode:

Bidirectional (regular) mode Unidirectional broadcast transmit mode

Unidirectional broadcast receive mode


30/54




(MP-2100/2104 only)

Selects the I/O slot number of the destination main link module:

When using the or modes, you can select the desired I/O

slot.

When using the mode, this field automatically changes to , to

remind you that the destination port must be selected using the DEF TS

command.

(MP-2100/2104 only)

Selects the number of the main link port on the selected destination main link

module:

When using the or mode, you can select the desired

external port number. The supported range depends on the number of external

ports available on the main link module installed in the slot selected by the

parameter.

When using the mode, this field automatically changes to , to

remind you that the destination port must be selected using the DEF TS

command.

(MP-4100 only)

Specifies the module (I/O slot) to which the data stream handled by the port is

routed. The available selections are the CL.1 modules installed in the chassis, and

I/O modules IO-1 to IO-10.

When using the mode in MP-2100/2104, this field automatically

changes to , to remind you that the destination port must be selected using

the command. In MP-4100, the destination slot and port are not defined

for this mode.

(MP-4100 only)Specifies the port to which the data stream handled by the port is routed.The available selections are 1 to 8 for external ports, or 1 to 63 (1 to 84) for

internal (virtual) ports (actual range depends on the destination module).

Default: None

When using the mode in MP-2100, this field automatically changes to

, to remind you that the destination port must be selected using the

command. In MP-4100, the destination slot and port are not defined for this

mode.

Selects the timeslot mapping method when the destination is a E1/T1 port using

the legacy service mode ( ):

When using the or mode for a module installed in a

MP-2100 chassis, this field automatically changes to , to remind you that

the destination must be selected using the DEF TS command. When the

module is installed In a MP-4100 chassis, this field does not appear.

When using the mode, you can select the desired mode:

You can select the desired uplink timeslots on the timeslot map.

The external port is assigned consecutive timeslots, starting with

the timeslot specified by means of the parameter.


31/54




Selects the starting timeslot in the frame of the destination E1/T1 port.

This parameter can be selected only when using the mapping mode; when

using any other mode, this field automatically changes to .

The allowed range is 1 to 31 for E1 ports, and 1 to 24 for T1 ports.

Table 3-2. External Port Parameters


(MP-2100/2104

only)

Determines whether the corresponding port will be connected to a composite channel:

Channel is connected to the composite channel selected by means of the field

Channel is disconnected. You can still program the desired parameters, so the

channel will be ready to operate when needed

Used to enable/disable the flow of traffic through the selected port:

The flow of traffic is enabled.

The flow of traffic is disabled. This state should be selected as long as the port

configuration has not yet been completed, or when it is necessary to stop

traffic flow through the port.

Selects the protocol used by the data channel being configured:

Asynchronous operation

Synchronous operation

Rate Determines the channel data rate, in kbps.

Group 1: 2.4, 4.8, 9.6, 19.2, 38.4

Group 2: 7.2, 14.4, 28.8, 57.6

Group 3: 8.0, 16.0, 24.0, 32.0, 48.0, 56.0, 64.0

: Both channels of a given pair must operate at rates belonging to the same group. Group 3 rates can be

selected only on channels using the synchronous protocol.

Selects the data channel timing mode. Applicable only if the SYNC protocol has been

selected. For a description of channel timing modes, refer to the MP-2100/2104Installation and Operation Manual.

The channel interface operates as a DCE, and provides transmit and receive

clocks to the synchronous user DTE.

The channel interface supplies the receive clock to the users equipment

and accepts the user transmit clock.

The channel interface requires transmit and receive clock signals from

the users equipment.


32/54




: When selecting the data channel timing reference, set the interface module DTE/DCE switches as follows:

DCE clock mode: the DTE/DCE switch is set to DCE

DTE or External DCE clock mode: the DTE/DCE switch is set to DTE.

For details on the interface module internal switches settings, refer toSection 2.2.

(MP-2100/2104)

(MP-4100)

Determines the handling of control signals by the data channel:

End-to-end transmission of control signals is disabled. Only local support is

enabled

The state of the local RTS line is transmitted to the remote DCD line.

The state of the local RTS line is transmitted to the remote DCD line, and

the state of the local DTR - to the remote DSR line.

: Both channels of a given pair must be assigned to support the matching control signals.

Selects the state of the local CTS line:

CTS line is constantly ON.CTS line follows the state of RTS line.

Selects the number of data bits. Applicable only if the ASYNC protocol has beenselected.

9

8

7

6


(MP-2100)

(MP-4100)

Selects the composite channel to which the corresponding external port will be

connected:

The corresponding channel is connected to internal port 1.

The corresponding channel is connected to internal port 2 (LS-12 only).

: Both channels of a given pair must be connected to the same internal composite channel.

3.5 Assigning Timeslots

After performing the configuration of the individual module channels, it is

necessary to assign uplink bandwidth to each connected channel.

When using the or mode in the module installed in the

MP-2100/2104 chassis, use the command to assign timeslots, and

the to assign a fraction of a timeslot, as explained in the

Megaplex-2100/2104 Installation and Operation Manual.


33/54



When using the mode in the module installed in the

MP-2100/2104 chassis, timeslot assignment for the receive direction is made

using the dedicated routing fields of the command.

For the module installed in the MP-4100 chassis, always use the

screen, as explained in the

Megaplex-4100 Installation and Operation Manual.

3.6 Displaying Status and Configuration

Information

The Megaplex-2100/2104user can read the LS-6N, LS-12 status and

configuration information using the command. For a general

description of this command, refer to Appendix Fof the Megaplex-2100/2104

Installation and Operation Manual.

The command includes two sections:

: displays the timing mode of each channel at the

time the command has been received by the module.

: displays a data form similar to that displayed by the

command, showing the current configuration of each external and

internal port. For a description of the displayed parameters, refer to

Table 3-1 and Table 3-2.

The Megaplex-4100user can read the LS-6N, LS-12 status and configuration

information using the screen, for every slot

and link of the I/O or CL.1 module to which the LS-6N, LS-12 timeslots have been

assigned. A typical subscreen is

. For a general description of this menu, referto Chapter 4of the Megaplex-4100 Installation and Operation Manual.


34/54




35/54

LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Test and Diagnostic Functions 4-1

Chapter 4

Troubleshooting and

Diagnostics

This chapter explains the specific tests and diagnostic functions of the LS-6N and

LS-12 modules and provides troubleshooting instructions.

For a description of the alarm and configuration (sanity) error messages

generated by LS-6N, LS-12 modules, refer to Appendix Bof the

Megaplex-2100/2104 Installation and Operation Manualor Chapter 5of the


The diagnostic information presented in this chapter supplements the generaldiagnostics and troubleshooting information instructions contained in the

corresponding Megaplex Installation and Operation Manual.

4.1 Test and Diagnostic Functions

In addition to the two front panel alarm indicators, the LS-6N, LS-12 modules

have a complete set of test and loopback functions that includes two levels:

Composite data streams generated by the module (the data streams sent to

the main link)

Individual data channels.

When a test or loopback is activated, the user can also specify the time it remains

active: the range is 1 through 30 minutes, in 1-minute steps. After the specified

time, the test or loopback is automatically deactivated by the module, thereby

reducing the management workload during system troubleshooting. The default

selection is continuous connection, that is, the test or loopback remains active

until canceled by a user's command. The following sections describe the available

diagnostic activities.

Composite Data Stream Loopback Functions

The LS-6N, LS-12 modules support the local digital and remote digital loopbacks

on the composite data stream.

To activate a test on a composite data stream in a LS-6N, LS-12 module

installed in a MP-2100/2104 chassis, use the or

command (where SS is the slot number and X is the internal port number

(1 or 2), and then select the local/remote loopback, as described in the

Megaplex-2100/2104 Installation and Operation Manual.


36/54

Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual

4-2 Test and Diagnostic Functions LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

To activate a test on a composite data stream in a LS-6N, LS-12 module

installed in a MP-4100 chassis, use the

menu, and then select the local or remote loopback, as described in the


Composite Data Stream Local Digital Loopback

When a local loop is activated on the LS-6N, LS-12 composite data stream, the

module composite transmit signal is returned to its receive path. As a result, eachindividual channel receives its own signal.

The composite transmit signal is still connected to the transmit path and reaches

the LS-12 module installed in the remote Megaplex unit, therefore the remote

equipment does not lose synchronization.

While the loop is connected, all the local users connected to the module must

receive their own signals, and the S.LOSS indicators of the local module must be

off. This loopback provides a quick operational check of the local module. The

loopback signal path is shown in Figure 4-1.

Composite Data Stream Remote Digital Loopback

When a remote composite data stream loopback is activated, the LS-12 module

loops back the receive signal toward the remote equipment. The received signal

remains connected as usual to the receive path of the local module, and

therefore the local S.LOSS indicates must be off. The loopback signal path is

shown in

Figure 4-2.

While the loop is connected, and the link to the remote equipment operates

normally, all the users connected to the remote module must receive their own

signals, and the S.LOSS indicators of the modules must be off.

This loop allows the user to perform a quick operational check of the end-to-end

transmission via this module.


37/54

Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics


LS-12

I/OM

ODULES

LS-12

I/OMODULES

Local Unit

SystemManagement

Remote Unit

User or

Test

Equipment

User or

Test

Equipment

Channel 1

Channel 2...

.

.

.

....

Channel 12

Figure 4-1. Composite Local Loopback, Signal Path

LS-12

I/OM

ODULES

LS-12

I/OMODULES

Local Unit

System

Management

Remote Unit

User or

TestEquipment

User orTest

Equipment

Channel 1

Channel 2...

.

.

.

....

Channel 12

Figure 4-2. Composite Remote Loopback, Signal Path


38/54


4-4 Test and Diagnostic Functions LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

Data Channel Stream Loopback Functions

The LS-6N, LS-12 modules support the following test and loopback functions on

the individual data channels:

Local digital loopback

Remote digital loopback

Bit error rate testing (BERT) on a selected data channel.

The tests are activated as follows:

To activate a test in a LS-6N, LS-12 module installed in a MP-2100/2104

chassis, use the or command (where SS is

the slot number and X is the internal port number (1 or 2), and then select

the local/remote loopback or BERT, as described in the Megaplex-2100/2104

Installation and Operation Manual.

To activate a test in a LS-6N, LS-12 module installed in a MP-4100 chassis,

use the menu, and then select the

local or remote loopback, as described in the Megaplex-4100 Installation andOperation Manual.

Data Channel Local Digital Loopback

The local channel loop is performed within the channel user interface, by

returning the transmit signal arriving from the user on the receive path. The

transmit signal remains connected to the transmit path and reaches the remote

user.

The loop signal path is shown in Figure 4-3. This loopback provides a quick

operational check of the connections between the user equipment and the LS-

6N, LS-12 channel.

LS-12

I/OM

ODULES

LS-12

I/OMODULES

Local Unit

System

Management

Remote Unit

User or

Test

Equipment

User or

Test

Equipment

Channel 1

Channel 2...

.

.

.

....

Figure 4-3. Data Channel Local Digital Loopback, Signal Path


39/54



Data Channel Remote Digital Loopback

The remote channel loopback is performed by returning the signal received from

the remote user on the transmit path. The received signal remains connected as

usual to the receive path of the local channel.

The loopback signal path is shown in Figure 4-4. This loopback allows the user to

perform a quick operational check of the end-to-end transmission via this channel.

LS-12

I/OM

ODULES

LS-12

I/OMODULES

Local Unit

System

Management

Remote Unit

User or

Test

Equipment

User or

Test

Equipment

Channel 1

Channel 2

.

.

...

.

....

Figure 4-4. Data Channel Remote Digital Loopback, Signal Path

BER Testing on Data Channels

The BER test checks proper data transmission through the path serving theselected LS-6N, LS-12 channel, to obtain a qualitative evaluation of data

transmission without using external test equipment.

The bit error rate is measured by applying a 511-bit pseudo-random test

sequence, generated by an on-board generator, to the input of the channel

transmit path. The transmitted data is returned by means of a loop somewhere

along the data path (e.g., by connecting a local or remote loopback) to the

receive path of the channel, and routed to a test sequence evaluator. Instead of

using a loopback, it is also possible to activate the BERT at both ends of the link,

because the same data patterns are used at both ends. The evaluator compares

the received data, bit by bit, to the original data and detects any difference (bit

error). The output of the evaluator is sampled during module polling, to checkwhether errors were detected in the interval between consecutive pollings. The

total number of intervals during which errors were detected are counted and can

be displayed to the operator. Only one BER test can be performed on the module

at any time.

The BER test is not supported by the MP-4100 chassis.Note


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4-6 Frequently Asked Questions LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

Recommended Test Sequence

The tests and loops available on the LS-6N, LS-12 modules provide a rapid and

efficient way to identify the general location of a fault at either the module, or in

the external equipment serving the module channels. The following instructions

refer to local and remote units on the assumption that the system includes

one system management, which is connected to the local unit.

Use the following sequence of tests:

Step Action Interpretation of Results

1 Activate local composite data stream loops at

both the remote and local LS-6N, LS-12

modules

A fault indication at either side means that the

corresponding LS-6N, LS-12 module is faulty

2 Deactivate the local composite data stream

loops

Not applicable

3 Activate a local channel loop on the side that

reports a channel problem

The equipment connected to the channel should

receive its own signal correctly. If not, the

problem is with the equipment and/or its

connections to the LS-6N/12 module

4 Deactivate the channel loop Not applicable

4.2 Frequently Asked Questions

The delay through the MP-2100/2104 is:

2.4 kbps = 35 msec

4.8 kbps = 17 msec

9.6 kbps = 10 msec

The LS-12 module must work opposite another LS-12 module or LS-6N

module (which is basically the same module, but with only 6 data

channels).

No. LS-6N can work only in point-to-point mode. Configuration data for

external ports must be sent as a bundle to a single main link port and

opened at the remote side. To enable point-to-multipoint configuration,

you can use an LS-12 module. This 12-port module allows sending data to

two different sites.


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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Technical Support 4-7

Yes, they do. All the differences between the two module locations are

purely chassis/common logic related (command line vs menu interface,

main link vs CL or I/O ports as timeslot destinations, etc.) The only module-

level difference is that the BER Test is currently not supported in the

Megaplex-4100 chassis.

4.3 Technical Support

Technical support for this product can be obtained from the local distributor from

whom it was purchased.

For further information, please contact the RAD distributor nearest you or one of

RAD's offices worldwide. This information can be found at www.rad.com (offices

About RAD > Worldwide Offices; distributors Where to Buy > End Users).
http://www.rad.com/http://www.rad.com/


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4-8 Technical Support LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2


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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Data Channel Connectors A-1

Appendix A

Pinouts

A.1 Data Channel Connectors

The LS-12 user data channels terminate in two 68-pin female SCSI connectors

designated CH.1-6 and CH.7-12. LS-6N includes only one connector designated

CH.1-6. Table A-1 lists theconnectors pin allocations. Note that the direction of

control signals depends on the channel interface mode.

Table A-1. CH.1-6 and CH.7-12 Connectors, Pin Assignment

1 - - Frame Ground, all channels

2 1 7 Transmit data, channel 1 (7) In Out

3 1 7 External transmit clock, channel 1 (7) In Out

4 1 7 Data carrier detect, channel 1 (7) Out In

5 1 7 Data set ready, channel 1 (7) Out In

6 1 7 Clear to send, channel 1 (7) Out In






12 3 9 External receive clock, channel 3 (9) In Out










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Appendix A Pinouts Installation and Operation Manual

A-2 Data Channel Connectors LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2



23 5 11 External receive clock, channel 5 (11) In Out24 5 11 Transmit data, channel 5 (11) In Out











35 1 7 Receive clock, channel 1 (7) Out In

36 1 7 Request to send, channel 1 (7) In Out

37 1 7 Receive data, channel 1 (7) Out In

38 1 7 Transmit clock, channel 1 (7) Out In

39 1 7 Data terminal ready, channel 1 (7) In Out















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Installation and Operation Manual Appendix A Pinouts

LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Octopus Cable A-3



55 4 10 Transmit clock, channel 4 (10) Out In56 4 10 Data terminal ready, channel 4 (10) In Out












68 Signal ground, all channels

A.2 Octopus Cable

RAD offers special octopus cables that end in six 25-pin D-type male connectors,

and can be used to connect directly the LS-6N, LS-12 data channels to DTE

equipment. Table A-2lists the connections between the pins of the 68-pin SCSI

connector, which connect to the CH.1-6 or CH.7-12 connector of the

LS-6N, LS-12 module, and the pins in the six user-side connectors of the cable.

Table A-2. CBL-LS12 Octopus Cable Wiring

1 Frame Ground, all channels All connectors, pin 1

2 Transmit data, channel 1 (7) Connector 1 (7), pin 2

3 External transmit clock, channel 1 (7) Connector 1 (7), pin 24

4 Data carrier detect, channel 1 (7) Connector 1 (7), pin 8

5 Data set ready, channel 1 (7) Connector 1 (7), pin 6


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A-4 Octopus Cable LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2

6 Clear to send, channel 1 (7) Connector 1 (7), pin 5






12 External receive clock, channel 3 (9) Connector 3 (9), pin 11























35 Receive clock, channel 1 (7) Connector 1 (7), pin 17

36 Request to send, channel 1 (7) Connector 1 (7), pin 4

37 Receive data, channel 1 (7) Connector 1 (7), pin 3


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Installation and Operation Manual Appendix A Pinouts

LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Octopus Cable A-5

38 Transmit clock, channel 1 (7) Connector 1 (7), pin 15

39 Data terminal ready, channel 1 (7) Connector 1 (7), pin 20





























68 Signal ground, all channels All connectors, pin 7


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A-6 Octopus Cable LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2


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Tel: +972-3-6458181, Fax +972-3-6483331, +972-3-6498250

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764-229-11/07

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Manual de Instalación y Operación del Modulo LS-6 L-12

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Transcript of Manual de Instalación y Operación del Modulo LS-6 L-12