DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1575SYNC (Synchronization)
9
Figure 9-99. Synchronization Troubleshooting, Page 6 of 6
Notes for Sheet 1 through Sheet 6 flowcharts (when checking for slip errors, use
the table above,
Error Log Entries for Slip Errors
):
1. Use the
status synchronization
command to determine whether
synchronization is enabled and to determine the on-line reference. If the
on-line reference is a tone-clock board, the switch is operating in free run
mode. If the Stratum 3 is displayed, and no DS1s are connected to the
Stratum 3 clock or no DS1 connection existed to the Stratum 3 clock for
over 24 hours, then the Stratum 3 clock is in free run mode.
2. Check for slip errors against DS1-BD and UDS1-BD.
3. If Stratum 3 is administered (
display synchronization
) and on-line
(
status synchronization
), check for DS1-BD or UDS1-BD slip errors for
the DS1(s) or UDS1(s) used as input to the Stratum 3 clock. Check the
LED indications on the Stratum 3 clock to determine which DS1 is
providing input to the Stratum 3 and examine the cross connect
information for that DS1.
4. Check for slips errors against EXP-INTF, SNI-BD, and TDM-CLK.
Yes
13
GOOD REFERENCE
BUT SN NOT
IN SYNC
REPLACE ONE AT A
TIME: EI, SNI, AND
TONE-CLOCK
ASSOCIATED WITH
REFERENCE PN.
IF SLIPS REMAIN,
REPLACE SNC.
SLIPS ON MANY
EIs, TONE-CLOCKs,
OR SNIs ASSOCIATED
WITH AN SN
CARRIER
REPLACE SNI, EI,
TONE-CLOCK FOR
PN WITH SLIPS
CSS SYSTEM NOT
TOTALLY IN SYNC
E
ESCALATE
DONE
Yes
Yes
14
No
No
SLIPS
ISOLATED
TO A PN?
SLIPS
REMAIN?
No
