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Bandwidth Requirements
The bandwidth required for IP calls is determined by three factors. The first factor is the vocoder
selection. The most popular vocoder is G.729 with a compression ratio of 8:1. This vocoder
takes a traditional 64 kbps call and compresses it to 8 kbps. The second factor is a custom
feature called Frame Multiplier. This user-definable feature adjusts the number of voice samples
that get placed inside a single network packet. The third factor is the total number of InterPrise
gateways communicating together on the network. This is due to another custom feature called
Call Aggregation. Simply put, this allows IP calls destined to the same place to share the network
protocol overhead. This allows the overhead to be distributed over multiple calls, thus reducing
the required bandwidth per call.
The three factors all affect the amount of bandwidth required for the voice traffic. Although the
average total rate per call is around 12-14 kbps (using G.729), certain configurations can require
as much as 18 kbps and as little as 8.5 kbps when using the G.729 vocoder. The values can be
predicted using the formulas provided in the installation manual. Until the actual layout of a
network is known, it is impossible to know exactly what the required bandwidth will be. However,
once the layout is known, precise calculations can be generated and used in designing even the
most rigid of networks.
Regulatory Approval
•
Approved for direct PSTN or PBX connectivity in the following countries:
United States
o
Canada
o
Austria
o
Belgium
o
Denmark
o
Finland
o
France
o
Germany
o
Greece
o
Holland
o
Iceland
o
Ireland
o
Italy
o
Luxembourg
o
Norway
o
Portugal
o
Spain
o
Sweden
o
Switzerland
o
UK
o
•
The 100-ohm T1 Line Interface Card (LIC) for this system complies with Part 68 of the U.S.
Federal Communications Commission (FCC) rules (FCC registration number: BE2USA--
27119--CN--N).
•
The 120-ohm E1 Line Interface Card (LIC) complies with the pan-European requirement CTR
4 and is approved by NMi (Notified Body # 0122).
Some features or applications mentioned may require a future release and are not available in the initial release. Future product
features and applications are subject to availability and cost. Specifications are subject to change without notice. Some features
may require additional hardware and/or special software.
©Copyright 2000 Inter-Tel Incorporated
InterPrise 3200D
March 2002
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