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

For information on port network connectivity, see Administration for Network Connectivity for
Avaya Communication Manager, 555-233-504.
Reliability when sending voice bearer over direct-connect, ATM, or CSS
The S8720/S8710 Media Server supports the following reliability configurations with
direct-connect, CSS, or ATM port network configurations:
● 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.
● High reliability
High reliability includes duplicated control networks and duplicated servers. The servers are
each connected to two Ethernet switches. These Ethernet switches are normally each
connected to the IPSI-connected port networks. Two separateTN2312BP IPSI circuit packs
in each IPSI-connected PN is connected to one of the Ethernet switches. 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.
● Critical reliability
Critical reliability includes duplicated servers, duplicated control networks, and duplicated
bearer networks. In addition to the control duplication of the high reliability option, fiber
connections between port networks are duplicated. For direct-connect configurations,
TN570 Expansion Interface connections are duplicated. For CSS configurations, each CSS
node has two switch node carriers, such that switch node interfaces are duplicated. For
ATM configurations, the ATM switches are duplicated.
Multiple reliabilities among PNs
The port networks that are connected together with fiber in direct-connect, CSS, and ATM
configurations must all share the same reliability level. However, when IP-PNC port networks
are added to a configuration that includes fiber-PNC port networks, the IP-PNC port networks
may have a different reliability level. Additionally, IP-PNC port networks in the same
Communication Manager configuration can have different reliability levels.
Survivability
In addition to the high reliability of the duplicated S8720 or S8710 Media Servers, recovery
capability is embedded in the Communication Manager software that resides on the S8720 or
S8710 Media Server. Thus, the S8720 or S8710 Media Server can use the following recovery
options:
● S8700-series Media Server as an Enterprise Survivable Server on page 85
● S8300 Media Server in an LSP mode on page 86
84 Hardware Description and Reference for Avaya Communication Manager