DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-248ATM-SYNC (ATM Synchronization)
9
Figure 9-12. Stratum 4 synchronization with simplex ATM PNC
NOTE:
The TN722 DS1 Interface circuit pack d oes not provide a synchronization
reference as reliably as the TN767 or TN464C circuit p acks. Therefore,
administer the TN767 or TN464C circuit pac ks as the primary or second ary
sources.
Stratum 3 Synchronization
Stratum 3 synchronization is not supported in DEFINITY with ATM PNC.
Synchronization troubleshooting
A significant part of the Synchronization Recovery Strategy for a DEFINITY with
ATM PNC resides in the ATM switch’s clock hardware, firmware, and software.
DEFINITY monitors synchronization performance and alarms faulty c omponents
within DEFINITY. Refer to ‘‘SYNC (Synchronization)’’.
Clock
ExternalT 1/E1
ExternalT 1/E1
secondary
primary
ATMswitch fabric
ATMtiming distribution
Interface
module Interface
module Interface
module
ATM PN C
DEFINITY
PPN
DEFINITY
EPN
OC3 OC3
ATM-EI ATM-EI
Toneclock Toneclock
DS1 DS1DS1 DS1
T1-splitter
T1-primary T1-secondary
iodfst4LJK 011998