DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-648DS1-FAC (DS1 Facility)
9
External Loopback test #799 via the test ds1-facility UUCSSf
external-loopback command at the other end of the DS1 CONV
Complex, and repeat step s 2 and 3 for the other end-p oint.
If the system is not configured as a Critical Reliability System and if
there is only one DS1 facility, then the test #799 can only be
executed at the end whic h is closer to the SPE relative to the DS1
CONV circuit pack at the end of the DS1 CONV Complex. If the test
cannot be executed for this reason, then replace the c ables,
connectors and the CSU at the other end of the DS1 CONV
Complex.
5. If the problem could not be isolated by the ne ar-end external
loopback tests, then the fault s hould be between CSU A and CSU
B. Contact T1 Network Service to resolve the problem(*) .
6. If the problem still persists, check for excessive slips and
synchronization problems. Enter display errors and follow the
associated repair p rocedures for any SYNC, TDM-CLK, or SNC-BD
errors. For TN574 boards and TN1654 boards in T1 mode, c heck
line equalization settings as d escribed in the above section,
DS1 CONV-1 and DS1 CONV-2 Line Compensation
.
7. Enter display errors and follow the associated repair p rocedures
for any EXP-INTF, and SNI-BD errors for the Fiber Endpoints. Enter
display errors and follow the associated repair procedures for any
FIBER-LK errors for this fiber link.
8. If the problem still persists, rep lace this DS1 CONV circuit pac k.
9. If the problem still persists, rep lace the DS1 CONV circuit pac k at
the other end of the DS1 CONV Complex.
If D4 framing mode is used, an in-band alarm signal (RFA) will be
transmitted that will corrupt the transmi t data on this facility.
g.
Aux Data None
This entry in the DS1 Facility Error Log will only occur p rior
to release V5. The DS1 CONV circuit pack’s neighbor (the DS1 CONV
circuit pack at the ot her end of the DS1 CONV complex) is unable to frame
up on the signal being sent to it by this DS1 CONV circuit pac k on this DS1
facility. The far-end facility will be in LFA state. To isolate faults for this
case, follow the repair proc edure for error type 1025 for the other end of
the DS1 facility. Note that references to the near-end and far-end are
reversed, for example, the neighb or is now the near-end. If D4 framing is
used, received data will be corrupted as well as transmitted data.
Aux Data 1
indicates that the facility i s detecting a Remote Frame Alarm
(RFA), also known as the YELLOW alarm, being sent by the remote DS1
endpoint. This Yellow alarm corresponds to the yellow F2 state
documented in CCITT Recommendation I.431. If D4 framing is used,
received data will b e corrupted in ad dition to transmitted data.