Nortel Networks NN43001-314 User Manual
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Appendix B Branch Office engineering example
LAN/WAN kbps = TCON (erlangs) x 37 kbps
—End—
Procedure 52
Calculating known conference traffic
Step
Action
When a Branch Office is known or expected to make a significant number of
conference calls, traffic statistics should be collected or estimated. Use the
statistics to calculate LAN/WAN bandwidth requirements.
conference calls, traffic statistics should be collected or estimated. Use the
statistics to calculate LAN/WAN bandwidth requirements.
1
Calculate conference traffic:
Cc = conference calls/busy hour (a 6- or 3-way conference call is
counted as 6 or 3 calls, respectively)
counted as 6 or 3 calls, respectively)
Ht = Average talk time (holding time) of conference in seconds (if you
have no data, use 900 seconds as a default)
have no data, use 900 seconds as a default)
TCON = (3 x # 3-way conference calls + 6 x # 6-way conference
calls + ...) x Ht/100 CCS = Total Cc x Ht/3600 erlangs
calls + ...) x Ht/100 CCS = Total Cc x Ht/3600 erlangs
2
Calculate LAN/WAN bandwidth:
For a G.729A/30 ms codec:
LAN/WAN kbps = TCON (erlangs) x 9 kbps
For a G.711/30 ms codec:
LAN/WAN kbps = TCON (erlangs) x 37 kbps
Use other bandwidth data from
if the codec and payload differ
from those listed above.
—End—
With local conference Integrated Conference Bridge card
When a Branch Office conference is provided locally, there is no need to
route conference traffic to the main office for service. A local conference
generates no LAN/WAN traffic and does not require a LAN/WAN bandwidth
calculation.
route conference traffic to the main office for service. A local conference
generates no LAN/WAN traffic and does not require a LAN/WAN bandwidth
calculation.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314
01.02
Standard
Release 5.0
20 June 2007
Copyright © 2007, Nortel Networks
.