HP Survivable Branch Communication zl Module powered by Microsoft Lync Planning and Design Guide 2011-02

2-15
Design Considerations
Planning Call Capacity
Table 2-12. Estimate Concurrent Remote Peer-to-Peer Calls (Example)
Table 2-13. Estimate Concurrent Remote PSTN Calls (Example)
You decide to use the maximum bandwidth required for RTAudio encoding
without FEC for your peer-to-peer estimates. Therefore, you estimate that the
calls to Lync users at other sites will require about 3.6 Mbps. In this example,
you are not using Media Bypass for the remote PSTN calls, but you do estimate
that some calls will require G.711 encoding. You decide to use 60 Kbps, which
is the typical bandwidth for G.711, for your estimates. The estimated 30 remote
PSTN calls would require about 1.8 Mbps.
Usage Level Number of Users at
That Level
Estimated
Concurrent Calls
Total Estimated
Concurrent Calls
Light
One remote peer-to-
peer call per user per
hour
X = 0 X/15 = A = 0 A + B + C = D = E = 90
Medium
Two remote peer-to-
peer calls per user
per hour
Y = 900 Y/10 = B = 90
Heavy
Three remote peer-
to-peer calls per user
per hour
Z = 0 Z/5 = C = 0
Usage Level Number of Users at
That Level
Estimated
Concurrent Calls
Total Estimated
Concurrent Calls
Light
One remote PSTN
call per user per hour
X = 450 X/15 = A = 30 A + B + C = D = F = 30
Medium
Two remote PSTN
calls per user per
hour
Y = 0 Y/10 = B = 0
Heavy
Three remote PSTN
calls per user per
hour
Z = 0 Z/5 = C = 0