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DS1-FAC (DS1 Facility)
Issue 1 June 2005 1067
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 converter circuit pack.
6. If the problem still persists, replace the DS1 converter circuit pack at the other end of the
DS1 converter complex.
l. Error Type 2305: Facility Packet Channel Loopback Error. This error indicates that the DS1
converter primary facility that carries the packet time slots and DS1 control channel is
looped to itself. This error applies only to facilities A and B on TN1654 DS1 converter
boards. If both facilities A and B are being used and firmware detects a loop-back 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 PN will be down until this loop back is removed.
1. Check the loop-back LEDs on both CSU A and CSU B as shown in Figure 51: DS1
Facility Connections on page 1068 to see if a CSU is in a loop-back mode. Also check to
see if the CSUs have been manually hard-wired into a loop-back mode. Remove
detected loop backs.
2. If the CSUs are not in loop-back mode, reset both DS1 converter boards via reset
board.
m. Error Type 2561: Facility Jitter Alarm. This alarm indicates excessive receive jitter on the
DS1 facility. This error only applies to TN1654 DS1 converter boards. The problem is
external to the DS1 converter board. It could be caused by bad wiring, a bad device (CSU
or repeater) or a bad signal coming in at the Network Interface.