Nortel Networks NN43001-314 - Manual (Page 372)

372 Appendix B Branch Office engineering example
Assumptions
Equipment characteristics
Assume the Branch Office has the equipment characteristics provided in
Table 39 "Equipment characteristics" (page 372) .
Table 39
Equipment characteristics
Number Type
120 IP Phones
36 Analog (500/2500-type) telephones
Traffic characteristics
Assume the Branch Office has the traffic characteristics provided in Table
40 "Traffic characteristics" (page 372) .
Table 40
Traffic characteristics
Number Comments
6 CCS For each IP Phone, 50% of calls go to other IP Phones,
and 50% of calls go to analog (500/2500-type) telephones
and PRI trunks.
5 CCS For each analog (500/2500-type) telephone, 40% of calls go
to PRI trunks, and 60% of calls go to IP Phones.
120 seconds The average holding time for each call.
Conference traffic is generally not singled out for calculation in traffic
engineering. When a Branch Office does not have conference capability,
conference call participants must use the LAN/WAN to reach the main
office to join conferences. However, if the traffic is significant (a rough
guide is more than 10% of IP Phone traffic), traffic should be included in
the LAN/WAN bandwidth calculation.
Required calculations
The following is a summary of the required calculations:
• number of Virtual Trunks to the main office
• number of Media Cards
• real-time load for the Call Server
• bandwidth for WAN
• bandwidth for LAN
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.