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Table 62: Inter-Site Traffic Availability improved with Redundant WAN
Connections (continued)
Full Solution Availability Projected
% of traffic between Boston and Cleveland
Annual downtime minutes due to failure in
Boston, WAN and in Cleveland
Aggregated Downtime
System Availability = 99.98%
Case Study IV (99.999% availability in Atlanta,
99.99% full system availability)
With Avaya Communication Manager 2.0, the Avaya G650 Media Gateway can provide the
optimum 99.999% availability using redundant IPSI connections. The G650 configuration
supports two IPSI circuit packs in active/standby mode.
The call control link to the media gateways is fully redundant. Upon any link or device failure,
there will be a failover to the standby path.
When engineered with duplicated IPSI-2 and N+1 C-LAN and MedPro circuit packs, the G650
Media Gateway reliability assessment projects 99.9995% availability. The following
recommendations based upon our example case environment ensure the objective availability
value is attainable.
G650 with redundant IPSIs in Atlanta and Boston Offices.
LSP as the alternate gatekeeper and call controller in Cleveland.
A fully redundant data network. In order to fully take advantage of the duplicated link
connection between the media servers and media gateways, the WAN path (when
calculated using redundant circuits) should be 99.995% to 99.999% available. It is
expected that every link has sufficient bandwidth to handle the full load of converged
traffic.
Note:
For these calculations, the LAN between the servers and the IPSIs is assumed to
Note:
have been engineered to meet 99.999% availability.
Design for High Availability
Weighted Downtime
minutes.
(0.9% + 0.9%)
563 = 13
112.25 minutes
(15 + 9.5 + 27 + 0.75 + 47 +
13)
Issue 3.4.1 June 2005
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