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LX TestingGlobal Product Learning Development, Denmark

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After this session you will be able to use the

following tools for test & diagnosis:

>Trail Trace Identifiers

> Loopback Connections

> Test Access Connections

ObjectivesObjectives

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Station B Station A

Received

Station A

Transmitted

Station A

SDH transport network

Trail Trace IdentifierTrail Trace Identifier

TTIs:

> Can be setup in RS, VC4, VC3 & VC12

> Can be up to 15 characters long

> If the Received TTI { Expected TTI then AIS is inserted

> Unreliable TTI means that TTI cannot be understood

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Setting up TTIsSetting up TTIs

Expected TTI:

A user-defined text string

that is the same as the

Transmitted TTI from the

other end of the trail

Transmitted TTI:

A user-defined text string to

be sent (and hopefully

received at the other end of

the trail!)

Detect Mismatch:

Should a check be made to see whether the Expected and Received TTI are

the same?

If they are not, a Path Trace Mismatch alarm is generated, and AIS

inserted

Received TTI:

The TTI actually received from the other end of the trail

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Loop Back ConnectionsLoop Back Connections

On 2, 34 and 45 Mbit/s signals you can make two kinds of loopback

connection:

Line Loopback

Terminal Loopback

On 1 GbE signals you can only make a terminal loopback connection

Line Loop back

PDH 2M, 34M, 45M

Terminal Loop back

PDH 2M, 34M, 45M, GbE

Normal Operation

Switching

Matrix

PDH 2M, 34M, 45M, GbE

Switching

Matrix

Switching

Matrix

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Creating a Loopback ConnectionCreating a Loopback Connection

Loopback on GbE port:

Off

Terminal

On GbE Interfaces PDH Interfaces

Loopback on 2, 34 and 45Mbit/s ports:

Off

Line

Terminal

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2 Mbit/s PMP Connector2 Mbit/s PMP Connector

> It is possible to monitor the outgoing signal from one2 Mbit/s port of each TEX1P module.

> Output and input traffic on the selected port is not affected

> It is the outgoing signal which is tested.The input signal to the port is not monitored.

PMP Connector:

Output signal from one port of each

TEX1P module can be monitored

Output via

PMP Connector

2 Mbit/s

port

To / from

CXC Module

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Test AccessTest Access

> For test and diagnostic purposes it is possible, on selectedPDH and SDH ports, to create

Test Access Points (TAP)

Test Access Connections (TAC)

A Remote Test Unit (RTU) (a Test-set) can be connected to

the TAP and via a TAC this can be connected to a signal

> Test Access Connections can be used for:

y Monitoring

y Split Access

y Loopback (not VC4)

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Converting a Termination Point to aTAPConverting a Termination Point to aTAP

Right-click on a termination point and select Convert to Test Access Point (TAP).

Note:

No cross connections

can be made on TAP

(symbolized by ).

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Test Access Set-upsTest Access Set-ups

LX A

LX C

LX D

With AIS

?

Monitor

Access

Create Test Access Point

in a TCP (Terminating

Connection point)

TAP

RTU

(Test set)

Terminal

Loopback

Near-end MonitoringLoopbackTest Access

Split

Access

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Creating a Test Access Connection 1Creating a Test Access Connection 1

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Creating a Test Access Connection 2Creating a Test Access Connection 2

.

Monitor alone

Split Access alone

Loopback alone

Loopback with monitor

Split Access w. AIS

Loopback alone with AIS insertion

Loopback with monitor and AIS insertion

Green lines indicate normal connections Purple lines indicate Test Access Connections

AIS

The boxes onthe right side

are used if AIS

should be

inserted

downstream

The boxes onthe left side

show the four

different

configuration

types

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Test Access Connection (TAC)Test Access Connection (TAC)

Types of Test Access Connection:

Loopback alone

Monitor

Split Access

Loopback with Monitor (not shown)

Test Access Point (TAP)

(symbolized by ).

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Test Access Set-upsTest Access Set-ups

LX A LX C

LX D

Monitor

Access

TAP

RTU

(Test set)

Create Test

Access Point

in a CP

(Connection Point)

TAP

Create Test

Access Point

in a TCP

(Terminated

Connection Point)

Far-end Monitoring via dedicated monitor trail

Configure a

dedicated

monitor trail

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