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 steps 2 and 3 for the other end-point.
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 which 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 cables,
connectors and the CSU at the other end of the DS1 CONV
Complex.
5. If the problem could not be isolated by the near-end external
loopback tests, then the fault should 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 procedures for any SYNC, TDM-CLK, or SNC-BD
errors. For TN574 boards and TN1654 boards in T1 mode, check
line equalization settings as described in the above section,
DS1
CONV-1 and DS1 CONV-2 Line Compensation
.
7. Enter
display errors
and follow the associated repair procedures
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, replace this DS1 CONV circuit pack.
9. If the problem still persists, replace the DS1 CONV circuit pack 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 transmit data on this facility.
g.
Aux Data None
This entry in the DS1 Facility Error Log will only occur prior
to release V5. The DS1 CONV circuit pack’s neighbor (the DS1 CONV
circuit pack at the other end of the DS1 CONV complex) is unable to frame
up on the signal being sent to it by this DS1 CONV circuit pack on this DS1
facility. The far-end facility will be in LFA state. To isolate faults for this
case, follow the repair procedure 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 neighbor 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 is 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 be corrupted in addition to transmitted data.
