Caring For Your Hardware - Linksys SPA9000 Administrator's Manual

Chapter 2 Getting Started
Table 2-1
Codec
G.711
G.726-40
G.726-32
G.726-24
G.726-16
G.729
This table is based on the following assumptions:
•
•
For more information about bandwidth calculation, refer to the following websites:
http://www.erlang.com/calculator/lipb/
http://www.packetizer.com/voip/diagnostics/bandcalc.html

Caring for Your Hardware

The SPA9000, SPA400, and the SPA900 Series phones are electronic device that should not be exposed
to excessive heat, sun, cold or water. To clean the equipment, use a slightly moistened paper or cloth
towel. Do not spray or pour cleaning solution directly onto the hardware unit.
Document Version 3.01
Ethernet Bandwidth Budget for Off-Net VoIP Calling
Approximate bandwidth budget for each
side of conversation
110 kbps
87 kbps
79 kbps
71 kbps
63 kbps
55 kbps
Bandwidth Calculated with No Silence Suppression
20 Millisecond of payload per RTP packet
The use of silence suppression can reduce the average bandwidth budget by 30% or more.
Note
2 calls 4 calls 6 calls
220 kbps 440 kbps 660 kbps
174 kbps 348 kbps 522 kbps
158 kbps 316 kbps 474 kbps
142 kbps 284 kbps 426 kbps
126 kbps 252 kbps 378 kbps
110 kbps 220 kbps 330 kbps
Linksys SPA9000 Administrator Guide
Implementing LVS
8 calls
880 kbps
696 kbps
632 kbps
568 kbps
504 kbps
440 kbps
2-7