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 does not provide a synchronization
reference as reliably as the TN767 or TN464C circuit packs. Therefore,
administer the TN767 or TN464C circuit packs as the primary or secondary
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 components
within DEFINITY. Refer to ‘‘SYNC (Synchronization)’’
.
Clock
External T1/E1
External T1/E1
secondary
primary
ATM switch fabric
ATM timing distribution
Interface
module
Interface
module
Interface
module
ATM PNC
DEFINITY
PPN
DEFINITY
EPN
OC3 OC3
ATM-EI ATM-EI
Tone clock Tone clock
DS1 DS1DS1 DS1
T1-splitter
T1-primary
T1-secondary
iodfst4 LJK011998
