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Table 50: S8300 hardware availability in two reliability configurations
Subsystem
S8300 Media Server
G700 Media Gateway
G350 Media Gateway
1. September 30, 2002 data. These are conservative engineering estimates. As field data are collected, the
numbers will be updated.
2. Standard Reliability:
S8300 — Single Internal Call Controller (ICC) equipped Media Gateway per site.
G700/G350 — Media Gateway interface to the call controller is supported by a non-redundant data
network.
3. High Reliability:
S8300 — Can failover to an LSP; N+1 media gateways at each site; each site has duplicate interfaces to
the data network: each IP endpoint is homed to at least 2 systems that are run by Communication Manager
(S8300, or otherwise). Avaya IP Telephones have multi-homing abilities, and can be configured to re-home
to any Communication Manager-run system. For example, in a configuration with @8700 at a main site
and S8300-ICC or G700 at remote site, the telephones at the remote site could re-home to main S8700
through separate Ethernet switches. This configuration could be said to provide 99.99% availability as well.
G700/G350 — Can failover to LSP upon a link failure; N+1 Media Gateways at each site with duplicate
interfaces to the data network. IP phones can home to an alternate gatekeeper (S8300, S8500, S8700, or
LSP).
4. The lower number is the equivalent availability for MTTR of 2 hours, which is attainable with technicians
and spares on site. See also
2
Standard reliability
Failures/
MTBO
Availability
year
(years)
(%)
1.314
0.65
99.91 /
99.95
1.314
0.65
99.91 /
99.95
1.314
0.65
99.91 /
99.95
Reliability and
availability.
1
3
High reliability
4
Failures/
MTBO
year
(years)
0.219
4.6
0.219
4.6
0.219
4.6
Issue 3.4.1 June 2005
Reliability
4
Availability
(%)
99.99 /
99.995
99.99 /
99.995
99.99 /
99.995
243
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