Procedure; Performing Ds3 Switching Tests - Nortel SONET AccessNode Manual

Procedure 3-4

Performing DS3 switching tests

Use this procedure to test DS3 protection switching capability (both manual
and automatic) on a new network element (NE) before performing the
end-to-end test.
Requirements
In this procedure, the user is doing loopbacks on optical channels and there are
minor limitations on the system in these conditions. Those limitations are: data
communication not operational, and removal of optical circuit packs could
cause momentary extra alarms for optics and tributaries (DS1, DS3, or both).
To establish traffic continuity, a network element user interface (NEUI) tool is
used to set up simple STS-1 connections between the feeder (OC-3/OC-12)
optical circuit packs and the DS1/DS3/OC-3 tributaries. See page 3-2 for a
description of useful commands of the Connection Services Command
Interpreter (CSCI) tool.
Before starting this procedure, you must
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Tools and materials
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be logged in to the NEUI and be at the main menu level
make sure the procedure "Performing DS1 switching tests" on page 3-20
is completed if your system has a DS1/DS3 mix
one DS3 digital transmission test set (Tx) (for example, Tau-Tron S5200)
one DS3 digital transmission test set (Rx) (for example, Tau-Tron S5200)
one variable optical attenuator with single-mode optical patch cords
one optical meter (for 1310 nm and 1550 nm optics)
two DS3 coaxial test cords with proper connectors (WECO-BNC)
one VT100 compatible CRT with user interface cable
three DS3 coaxial cords (BNC-to-BNC connectors)
CAUTION
Risk of traffic loss
Make sure the system being tested is not carrying
live traffic.
CAUTION
Risk of damaging circuit packs
Avoid touching any components on the printed
circuit board. Electrostatic-sensitive devices can be
damaged by electrostatic discharge. Always ground
yourself before handling the circuit pack.
AccessNode Site Testing Procedures 323-3001-221 Issue 2.0
Tributary and optical tests for VTBM rings 3-27
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