DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-651DS1-FAC (DS1 Facility)
9
the network. See the above sections, “Line Coding” and “Framing
Mode” for details on how these options apply to the TN574 and
TN1654 DS1 CONV boards.
3. 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
.
4. 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.
5. If the problem still persists, replace this DS1 CONV circuit pack.
6. If the problem still persists, replace the DS1 CONV circuit pack at
the other end of the DS1 CONV Complex.
k. Facility Packet Channel Loopback Error. This error indicates that the DS1
CONV primary facility which carries the packet timeslots and DS1 control
channel is looped to itself. This error applies only to facilities A and B on
TN1654 DS1 CONV boards. If both facilities A and B are being used and
firmware detects a loopback condition an attempt will be made to switch
the primary facility to the other facility. If the other facility is looped, down
or not being used, the EPN will be down until this loopback is removed.
1. Check the loopback LEDs on both CSU A and CSU B as shown in
Figure 9-28
to see if a CSU is in a loopback mode. Also check to
see if the CSUs have been manually hard-wired into a loopback
mode. Remove detected loopbacks.
2. If the CSUs are not in loopback mode, reset both DS1 CONV
boards via the
reset board
command.
l. Facility Jitter Alarm. This alarm indicates excessive receive jitter on the
DS1 facility. This error only applies to TN1654 DS1 CONV boards. The
problem is external to the DS1 CONV board. It could be caused by bad
wiring, a bad device (CSU or repeater) or a bad signal coming in at the
Network Interface.
