Nortel Networks NN43001-121 - Manual (Page 50)

50 Planning and engineering
For example, MCM works as a software load balancer in addition to a router.
MCM uses a round-robin algorithm for load balancing. When the current
Mediation Server does not answer, MCM jumps to the next Mediation
Server. You can use load balancing for direct mode and with SPS or SRS.
For Release 5.0, 1 GB of memory is required for a standard Signaling
Server. All signaling servers must run the latest software version. For
information on geographic redundancy, see
"Geographic redundancy" (page
78) .
Call Server requirements
The CS 1000 must run Release 5.0 with the Product Enhancement Package
or later.
For different CPUs, the number of supported users are:
• CP PII: 7000 users
• CP PIV: 13 000 users
• CP PM: 13 000 users
OCS Proxy and MCM capacity requirements
The MCM is required to reside on a separate OCS Proxy server and the
capacity of the OCS Proxy server with MCM depends on the hardware
platform and the usage. For example, VoIP calls only, SIP CTI calls only
or a combination of both. Because capacity characterization cannot be
conducted on all server platforms, Nortel recommends using standardized
sets of relevant benchmarks available from the Standard Performance
Evaluation Corporation (SPEC). SPEC is a non-profit corporation formed
to establish, maintain, and endorse benchmarks that can be applied to the
newest generation of high-performance computers. A compressive list of
benchmarks is available at
www.spec.org .
The server used for capacity characterization had a SPECint_rate2000
value of 18.6. See
Table 4 "Maximum call rate" (page 50) for the maximum
call rate of this server for the three different configurations.
Table 4
Maximum call rate
Usage Maximum call rate
VoIP calls 15 000
SIP CTI (TR/87) calls 10 000
Combined 12 500*
* Depends on the ratio of either call scenarios assumed 50% of each.
For example: Worst case–all SIP CTI calls, Best case–all VoIP calls.
Nortel Communication Server 1000
Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007
NN43001-121 01.03 Standard
Release 5.0 30 April 2008
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