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 Co ding” and “Framing
Mode” for details on how thes e options apply to the TN574 and
TN1654 DS1 CONV boards.
3. For TN574 boards and TN1654 boards in T1 mode, c heck line
equalization settings as d escribed in the ab ove section
DS1 CONV-1 and DS1 CONV-2 Line Compensation
.
4. 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.
5. If the problem still persists, rep lace this DS1 CONV circuit pac k.
6. If the problem still persists, rep lace the DS1 CONV circuit pac k at
the other end of the DS1 CONV Complex.
k. Facility Packet Channel Loopbac k Error. This error indicates that the DS1
CONV primary facility which c arries the packet timeslots and DS1 control
channel is looped to itsel f. This error applies only to facilities A and B on
TN1654 DS1 CONV boards. If both facilities A and B are b eing used and
firmware detects a loopb ack condition an attempt will be made to switch
the primary facility to the other fac ility. If the other facility is looped, d own
or not being used, the EPN will be d own until this loopbac k is removed.
1. Check the loopbac k LEDs on both CSU A and CSU B as shown in
Figur e 9-2 8 to see if a CSU is in a loopbac k mode. Also check t o
see if the CSUs have been manually hard-wired into a loopback
mode. Remove detected loop backs.
2. If the CSUs are not in loopback mode, reset b oth DS1 CONV
boards via the reset board command.
l. Facility Jitter Alarm. This alarm indicates exc essive 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 c ould be caused by bad
wiring, a bad d evice (CSU or repeater) or a bad signal coming in at the
Network Interface.