Maintenance-Object Repair Procedures
555-233-143
8-264 Issue 1 May 2002
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 communications among the G3r system, the ATM switch, and
other PBXs, Central Offices (COs) or customer-premises equipment (CPE).
Circuit packs involved in synchronization include:
NOTE:
TN768 or TN780 Tone-Clock circuit packs are not compatible with ATM EIs.
■ TN2312 IPSI circuit pack’s Tone-Clock circuit
■ TN2182 Tone-Clock
■ TN722, TN464, and TN767 DS1 Interfaces (all suffixes)
■ TN2305/6 ATM Expansion Interface (multimode fiber)
Synchronization is achieved between the
S8700 Media Server Multi-Connect IPSI
and the Expansion Port Networks (EPNs) through the ATM port-network
connectivity (ATM PNC) between the networks. Depending on the network’s
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,
refer to AT&T Network and Data Connectivity.
MO’s 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
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