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SYNC (Port-Network Synchronization)
Issue 1 June 2005 2145
S8700 IP
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. 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 124: S8700 Media Server
IP-Connected Sync Operation on page 2145.
Figure 124: S8700 Media Server IP-Connected Sync Operation
This figure also shows the far-right S8700 IP Connect system’s PN without public-network
digital interface. A PN without public-network connectivity runs off of its local IPSI circuit pack’s
Tone-Clock circuit.
PN PN PN
Public Switched Network
Primary
Primary
Secondary
Secondary
IP Network