Avaya Application Solutions Deployment Manual page 264

Reliability and Recovery
The following two tables show the result of the projected availability analysis for this
configuration.
Table 56: Case Study I: Standard Configuration Availability
and Impact of WAN Outages on Each Site
Site
Atlanta
Boston
Cleveland
The site availability values listed in the second column of
Configuration Availability and Impact of WAN Outages on Each Site
Avaya Communication Manager solution availability values. The site availability values listed in
column 4 include the impact of the enterprises' data network availability value on each site's
solution.
This combined value is assessed by considering the components involved to complete a call
from point A to point B. For example, for the calls generated in Boston the following components
are involved: Servers in Atlanta, Control signaling link over Atlanta LAN connection, WAN link
between Boston and Atlanta, Boston LAN connection, and the Media Gateway in Boston.
Table 57: Example Site Availability Calculation.
:
Table 57: Example Site Availability Calculation.
Component
S8700 Servers in
Atlanta
Data network between
Atlanta and Boston
Boston Media Gateway
Aggregated
264 Avaya Application Solutions IP Telephony Deployment Guide
Avaya Product
Availability Annual
Downtime
Minutes
99.95% 263
99.95% 263
99.95% 263
1. The duplex S8700 hardware calculation projects higher availability. The listed
number is a projected number for both hardware and Avaya CM software
application supported by the servers.
Enterprise's Solutions including
LAN and WAN Link Availability
Availability
99.95%
99%
99%
Table 56: Case Study I: Standard
shows the resulting calculation.
Availability Downtime minutes per year
1
99.9995% 2.6
99% -- 99.5% 2630 to 5260
99.95% 262.98
98%--99.4% 3155.76 (2.6 + 2630 +
262.98) to 7863 (2.6 + 5260
+262.98)
Per Site Annual
Downtime
Minutes
263
5260 (88 hr)
5260 (88 hr)
on page 264 represent