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DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-220ATM-SYNC (ATM Synchronization)
3
ATM-SYNC (ATM Synchronization)
This section discusses intra-switch synchronization maintenance and the
hardware and software components that provide a common reference frequency
for reliable digital communication among the G3r system, the ATM switch, and
other PBXs, Central Offices (COs) or Customer-Premises Equipment (CPE).
Circuit packs involved in synchronization include:
■ TN768, TN780, or TN2182 Tone/Clock
■ TN722, TN767, and TN464 DS1 Interfaces (all suffixes)
■ TN2305/6 ATM Expansion Interface (multimode fiber)
Synchronization is achieved between the Processor Port Network (PPN) and the
Expansion Port Networks (EPNs) through the ATM port network connectivity (ATM
PNC) between the networks. Depending on the network synchronization plan
and the status of synchronization sources, the system timing reference may be:
■ The clock circuit pack on the ATM switch
■ A DS1 or UDS1 interface circuit pack-tapped T1 input signal connected to
the ATM switch clock circuit
■ An OC-3 interface circuit pack on the ATM switch
Stratum 4 synchronization extracts timing information directly from
■ A DS1 or UDS1 reference
■ An OC3 reference
■ The ATM switch clock
For further information about synchronization including network synchronization,
see
AT&T Network and Data Connectivity
.
Stratum 4 Synchronization
Systems may have primary and secondary synchronization references
(DS1/UDS1 interface circuit packs or ATM-Switch) when using Stratum 4
synchronization.
If the primary synchronization reference in Figure 3-10
is providing a valid timing
signal, then the flow of system synchronization would travel from the DS1
interface circuit pack in the EPN to the ATM switch. The primary DS1 interface
circuit pack provides a timing signal for the ATM switch clock circuitry.
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run Full Name of MO
ATM-SYNC MINOR display errors ATM Synchronization
ATM-SYNC WARNING test synchronization ATM Synchronization