DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1562SYNC (Synchronization)
9
SYNC (Synchronization)
This section discusses synchronization problems local to the switch. For further
information about synchronization including network synchronization, see the
AT&T Network and Data Connectivity
.
Synchronization Maintenance is composed of both hardware and software
components and its purpose is to provide a common reference frequency for
reliable digital communication between the G3r system and other PBXs, Central
Offices(COs) or Customer-Premises Equipment (CPE). Synchronization is
implemented using several system components including:
■ TN768 or TN780 Tone-Clock
■ TN722, TN767 and TN 464 DS1 Interfaces (all suffixes)
■ TN572 Switch Node Clock
■ TN573 Switch Node Interface
■ TN570 Expansion Interface
Synchronization is achieved between the Processor Port Network (PPN) and the
Expansion Port Networks (EPNs) via the port network connectivity (PNC)
between the networks. Depending on the network synchronization plan and the
status of synchronization sources, the system timing reference may be a
Tone-Clock circuit pack, DS1 interface or UDS1 circuit packs, or an external
Stratum 3 clock. Stratum 4 synchronization extracts timing information directly
from a DS1 reference, UDS1 reference, or a Tone-Clock. Stratum 3
synchronization requires the use of a Stratum 3 clock that provides a timing
signal derived from DS1 references to the Tone-Clock circuit pack. The external
Stratum 3 clock is a more stable timing source than the Stratum 4 clock and
provides 24-hour holdover in case of reference failures and redundant
components.
If both a primary and a secondary reference are administered for Stratum 4
synchronization, both references must reside in the same port network.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run Full Name of MO
SYNC MINOR display errors Synchronization
SYNC WARNING test synchronization Synchronization
