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Table 64: Inter-site call Traffic Availability is Enhanced by Highly Available Data
Network. Percentage of traffic usage is listed in
Communities of Interest (COI) Matrix presented in Section 2.1
Full Solution Availability Projected
% of traffic generated in Atlanta
downtime minutes in Atlanta
% of traffic generated in Boston
downtime minutes in Boston
% of traffic between Atlanta and Boston
Annual downtime minutes due to failure
between Atlanta and Boston
% of traffic generated in Cleveland
downtime minutes in Cleveland
% of traffic between Atlanta and Cleveland
Annual downtime minutes due to failure
between Atlanta and Cleveland
% of traffic between Boston and Cleveland
Annual downtime minutes due to failure
between Boston and Cleveland
Aggregated Downtime
System Availability = 99.997%
As reflected in the case studies presented in this section, an IP Telephony solution can be
configured to meet an enterprise's desired level of availability. As shown by the examples,
Avaya IP Telephony solutions offer flexibility for designing a highly available system. The
optimum 99.999% availability within a site must include redundancy and optimized data network
design. For a geographically distributed system, the WAN is a major impediment to high
availability. For those enterprises with high inter-site call traffic, redundant WAN links
significantly enhance the full system availability. Such redundancy should provide sufficient
bandwidth to support the extra traffic in the event of a failure. In order to take full advantage of
link redundancy, the network should be designed with failure detection, multiple paths, and
failover capabilities. For more details on network design and configuration, see
network ready for
telephony.
Table 55
Weighted Downtime min.
Annual
(43.3% + 14.2%)
Annual
(16% + 2%)
(5.2% + 5.2%)
(5.2% + 5.2%)
Annual
(7% + 0.4%)
(2.7% + 2.2%)
(2.7% + 2.2%)
(0.9% + 0.9%)
(0.9% + 0.9%)
16.58
(3 + 4.7 + 2.7 + 4.4+ 1.3 +0.48)
13.02
(3 + 4.7 + 0.56 + 4.4 + 0.26+ 0.1)
Design for High Availability
and is according to the
5.3 = 3
26 = 4.7
26.3 = 2.7
5.3 = 0.56
59 = 4.4
26.3 = 1.3
5.3 = 0.26
26.3 = 0.48
5.3 = 0.1
Getting the IP
Issue 3.4.1 June 2005
273
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