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FIBER-LK (Fiber Link)
Issue 1 June 2005 1259
SNI Off-Board Destructive Facility Test (#756)
This test is destructive.
The SNI runs a destructive loop around of the on- and off-board looparounds. This test returns
the result of the off-board loop around, while Test 757 returns the result of the on-board loop
around. For SNI-to-SNI fiber links, this test is run on both SNI circuit pack endpoints of the fiber
link.
FAIL EI circuit pack can’t frame up to incoming signal. Several fail codes may be
returned depending on which endpoint can’t frame up. Error codes 2326,
2327, and 2328 denote Endpoint 1, Endpoint 2, and both endpoints,
respectively.
1. Clear any SYNC and TDM-CLK errors listed in the error log.
2. Run test board location for each EI board on this fiber link and
follow the appropriate repair sequence for any failing tests.
3. If the EI circuit pack fails Test #238 and is in the PN, and the red LEDs
are ON for a large number of circuit packs, then reseat any Tone-Clock
circuit packs in the PN. See the “How to replace Tone-Clock circuit
packs” section of TDM-CLK (TDM Bus Clock)
on page 2252
Maintenance documentation.
4. Enter display errors and follow the associated repair procedures
for any SNC-BD (if applicable to this fiber link configuration) or
TDM-BUS errors.
5. Perform the Fiber link fault isolation
in Chapter 4: General
troubleshooting in Maintenance Procedures (03-300192)”, described in
Chapter 5.
6. If the test continues to abort, follow normal escalation procedures.
PASS The EI circuit pack(s) have detected the valid framing signal on the fiber.
1. Refer to errors from other EI circuit packs, SNI (SNI) tests, or DS1
Converter tests (if present) if the link is still not functioning.
Table 437: Test #238 Expansion Interface Fiber Out-of-Frame Query Test (continued)
Error
Code
Test
Result
Description / Recommendation
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