Instruction manual

Circuit switched
Issue 4 May 2003 123555-233-767
WAN Spare Processor (WSP)
An ATM WAN Spare Processor (WSP) provides a disaster recovery option for a
media gateway G3r expansion port networks deployed over an ATM WAN.
An ATM WSP acts as a PPN in the event of a catastrophic failure in the network.
The ATM WSP continually monitors a path to the PPN to determine if it is on-line
and reachable. The WSP functions as a PPN if the main PPN is not functional or is
not communicating to one or more of the other EPNs. From one to 15 ATM WSPs
can be placed in a Communication Manager ATM port network configuration to
provide a backup arrangement of PPNs, thus maintaining the availability of the
Communication Manager features and functions.
NOTE:
ATM WSPs cannot be used with a conventional CSS.
Circuit switched
Center Stage Switch (CSS)
Communication Manager supports CSS as a method to interface between the PPN
and EPNs using circuit switched technology to carry the voice traffic.
Center Stage Switch (CSS) separation
S8700 Media Servers in an Avaya MCC1 or SCC1 Media Gateway configuration,
with four or more Port Networks (PN), use a Center Stage Switch (CSS) to
interconnect the PNs.
The Center Stage Switch (CSS) separation feature allows for the physical
separation of redundant S8700 Media Servers, and their corresponding CSS, to
improve their survivability. Media Servers and the CSS can be separated up to 6.2
miles (10 km), providing backup and survivability for a communications network
in one or more remote locations.
Internet Protocol (IP)
H.248 media gateway control
Communication Manager uses standards based H.248 to perform call control to
Avaya media gateways such as the G700. H.248 defines a framework of call
control signaling between the intelligent media servers and multiple
“unintelligent” media gateways.