Procedure; Performing Ds1 Switching Tests - Nortel SONET AccessNode Manual

3-20 Tributary and optical tests for VTBM rings

Procedure 3-3

Performing DS1 switching tests

Use this procedure to test DS1 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 is not operational, only bidirectional optical switching mode
is supported, and removal of optical circuit packs could cause momentary extra
alarms for optics and tributaries (DS1, DS3, or both).
Before starting this procedure, you must
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Tools and materials
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AccessNode Vol 3B 323-3001-221 Issue 2.0
be logged in to the NEUI at the main menu level
make sure that the initial commissioning is completed
make sure the procedure "Performing optical interface receiver sensitivity
tests" on page 3-7 is completed
one (1) DS1 digital transmission test set (Tx, Rx)
(for example, Tau-Tron S5104)
one (1) variable optical attenuator (VOA) (for example, HP 8156A) with
single-mode optical patch cords
one (1) optical meter (for 1310 nm and 1550 nm optics)
one (1) VT100-compatible CRT with user interface cable
two (2 ) DS1 patch cords (bantam-to-NE 310 connectors)
fourteen (14) DS1 patch cords (bantam-to-bantam 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.
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