Procedure; Testing Ds3 Or Sts-1 Protection Switching - Nortel SONET AccessNode Manual

2-32 DS3 tests, STS-1 tests, and optical in-bay tests

Procedure 2-4

Testing DS3 or STS-1 protection switching

Use this procedure to test protection switching of DS3 or STS-1 facilities on a
circuit pack basis at one site. The test sequence demonstrates that you can:
•
•
•
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High priority DS3s/STS-1s can override protection of low priority
DS3s/STS-1s.
Requirements
Do the following before starting this procedure:
•
To establish traffic continuity on a point-to-point or ring system, a network
element user interface (NEUI) tool is used to set up simple synchronous
transport signal (STS-1) connections between the feeder (OC-3/OC-12)
optical circuit packs and the DS1, DS3, STS-1, or OC-3 tributaries. See
page 3-2 for a description of the Connection Services Command Interpreter
(CSCI) tool.
AccessNode Vol 3B 323-3001-221 Issue 2.0
manually switch the DS3 or STS-1 traffic to the protection circuit pack
lockout a circuit pack and prevent it from switching to protection
simulate an equipment failure and cause automatic switching to occur
force a protection switch and override automatic switching
Note: Do not perform this procedure if DS1, DS3, or STS-1 protection
circuit packs are not installed. If the network element (NE) under test is not
equipped with DS1s, DS3s, or STS-1 then a protection circuit pack will not
be present; therefore this procedure can be omitted.
Alarms When a protection switch occurs, a minor alarm is
generated. Alarms are also generated whenever a circuit
pack is removed from its backplane connector. These
alarms should automatically clear when the circuit pack is
re-engaged.
You can review these alarms to verify the effectiveness of
your actions during the test procedures.
Make sure the system is not in service.
Note: STS-1 tributaries are supported only on a TN_BLSR shelf.
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