Hardware Description and Reference for Avaya ... - Avaya Support

Avaya S8700-series Media Servers
The Avaya UPS units send SNMP traps to the S8720/S8710 Media Server when power fails.
The server’s Global Maintenance Manager can then send an alarm to the services organization
or send a trap to a network management system. When a separate 48V-DC battery string is
used, it might be possible to send an alarm when voltage is below a threshold. However,
shutdown will not be mechanized.
USB modem
Each S8700-series media server in a server pair requires a Universal Serial Bus (USB) modem
for maintenance access and to call out an alarm. The modems can share a common phone line
if the media servers are colocated. When the media servers are separated an additional phone
line is required. The online server answers incoming calls. The callers can access the offline
server by means of a telnet session. Each modem connects to a USB port on the media server.
The USB modems used must conform to the Communication Device Class (CDC) specification,
and usually to the Abstract Control Model (ACM) subclass. A modem will not work with the
media server driver if the modem does not comply with the specifications.
Reliability
Reliability for IP-PNC
The S8720/S8710 Media Server supports the following reliability configurations with IP-PNC
configurations:
Note: Duplicated
● Standard reliability
Standard reliability includes duplicated S8700-series servers. When the active server fails,
an automatic interchange occurs, and standby server assumes call processing control.
During the interchange, most IP phone calls continue. All other calls are dropped.
● Duplicated control
High reliability includes duplicated control networks and duplicated servers. The servers are
each connected to two Ethernet switches, which are in turn connected to the customer LAN.
In each IP-PNC port network, two separateTN2312BP IPSI circuit packs are also connected
to the customer LAN. If the control connection through one Ethernet switch fails or the
connection to one IPSI fails, the other Ethernet switch and IPSI complete the connection to
the server.
● Duplicated control and duplicated bearer
In addition to the standard duplicated servers, duplicated IPSIs for control reside in each PN
and duplicated TN2602AP circuit packs reside in each PN to provide duplicated bearer.
Note:
bearer can be implemented without duplicated control.
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