Maintenance Object Repair Procedure
555-233-142
8-1034 Issue 1 May 2002
SYNC (Port-Network Synchronization)
This section discusses synchronization problems local to the switch. For further
information about synchronization including network synchronization, refer to
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 communications between an S8700 Media Server system and
other PBXs, central offices (COs), or customer-premises equipment (CPE).
Synchronization is implemented using several system components including:
■ TN2312 IPSI
■ TN722, TN767, and TN464 DS1 Interfaces (all suffixes)
NOTE:
If both a primary and secondary references are administered for Stratum-4
synchronization, both references must reside in the same port network (PN).
IP-Connected S8700 Media Server
Sync Operation
For an S8700 IP Connect system, its port networks (PNs) are connected via the
customer’s IP network. This network cannot be used to transmit timing
information between the PNs. The complete set of PNs need not be synchronized
with each other. Inter-PN bearer traffic is carried as VOIP, while the Media
Processors’ internal jitter buffers deal with differences in transmission rates.
Synchronization is needed for a PN with a public-network digital interface. Each
PN with a DS1 or trunk-side BRI interface must be synchronized with an external
timing source to prevent slips between that PN and the external circuit-switched
network. (In effect, each S8700 Media Server IP-connected PN needs to operate
like a Definity system.) Each S8700 IP Connect PN:
■ Potentially needs its own external synchronization reference
■ Is always locked to an external public-network interface
or is running locally. A typical S8700 IP Connect configuration is shown in
Figure 8-39.
MO’s Name (in
Alarm Log) Alarm Level Initial Command to Run Full Name of MO
SYNC MINOR display errors Port Network Synchronization
SYNC WARNING test synchronization Port Network Synchronization
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