Bandwidth Usage Table - Nortel Remote Gateway 9110 Reference Manual

Standard 1.6

Bandwidth usage table

The values shown in the following table are the bandwidth requirements when
using IP as the medium.
Packet Size
Voice Payload (bytes/30 ms)
Voice header (bytes)
UDP header (bytes)
IP header (bytes)
IP Packet Size (bytes)
LAN Overhead
Ethernet header Size (bytes)
IP Packet Size (bytes)
LAN Packet Size (bytes)
Peak Data Rate (Kbps)
Avg Data Rate-w/silence (Kbps)
IP Over Frame Relay Overhead
Frame Relay Overhead (bytes)
RFC 1490 IP Overhead (bytes)
IP Packet Size (bytes)
Frame size (bytes)
Peak Data Rate (Kbps)
Avg Data Rate-w/silence (Kbps)
1. compression algorithm
2. 9600 bps (14400 bps not supported)
3. The Remote Gateway 911x series and Digital Telephone IP Adapter units transmit packets that
are based on 64 byte boundaries. In other words, G.729A equals 128 bytes and G.711 equals 320
bytes. The Remote Gateway 911x series and Digital Telephone IP Adapter units do not support
G.726.
4. Average data rate with silence suppression is approximately 60% of Peak. Change this number to
reflect the site's actual values.
5. Silence suppression, or voice activity detection (VAD) is disabled.
26
1
G.711
240
12
8
20
280
14
280
3
294
78
4
47
4
2
280
286
76
4
46
Remote Gateway 9100 Series Network Engineering Guidelines
1
G.726 G.729A
120 30
12 12
8 8
20 20
160 70
14 14
160 70
174 84
46 22
28 13
4 4
2 2
160 70
166 76
44 20
27 12
June 2005
1
G.729A\FAX
38
12
8
20
78
14
78
92
24
5
24
4
2
78
84
22
5
22
2
1,