Nortel 1000 Fundamentals page 113
Ip trunk fundamentals
Hide thumbs
Also See for 1000:
- Description, installation and operation manual (646 pages) ,
- Features and services fundamentals (616 pages) ,
- Installation and commissioning manual (468 pages)
Table of Contents
Advertisement
Table 17
Silence Suppression disabled TLAN Ethernet and WAN IP bandwidth usage per IP Trunk 3.01
(and later) port
Codec
Multi -
frame
duration
(ms)
Codec
See Note
type
8.
10
G.711
(64 kbit/s)
20
voice
30
10
DSP profile
AB/G.729A
20
(8kbit/s)
30
voice
G.723.1
30
(5.3 kbit/s)
voice
G723.1 (6.3
30
kbit/s)
T.30/T.38
16.6
G3 Fax
25
Based on voice multiframe encapsulation for Realtime Transport Protocol per H.323 V2.
The bolded rows contain the default payload/packet size for each codec in TM 3.1.
TLAN subnet data rate is the effective Ethernet bandwidth consumption.
TLAN subnet kbit/s for voice traffic = 2*Ethernet frame bits*8/frame duration in ms
WAN kbit/s for voice traffic = IP packet bytes*8/frame duration in ms
Overhead (RTP/UDP header + IP header) of packets over the voice payload multiframe is 40 bytes;
overhead of Ethernet frame over IP packet is 26 bytes.
An Interframe gap is not included in the above bandwidth calculation, because of the low probability
of occurring in this type of application.
Length of speech captured at each end. By definition, payload is one way.
These values do not include overhead from the network header (IEEE 802.3) that is automatically
added at the TLAN subnet link. To determine the approximate bandwidth used on the TLAN subnet
when including the network header, divide the values in the column "Bandwidth use on TLAN
subnet in kbit/s (two way)" by 2.
Copyright © 2007, Nortel Networks
.
Voice/
fax
Ethern
paylo
IP
ad
header
header
size
size
(bytes)
(bytes)
(bytes)
80
40
160
40
240
40
10
40
20
40
30
40
20
40
24
40
30
40
30
40
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
Factors that effect the real-time capacity 113
PPP
Full-du
WAN
plex
Bandw
Ethern
idth
et
et
(bps)
Bandw
See
size
idth
Note
(bps)
9.
26
116,800
101,600
26
90,400
82,800
26
81,600
76,533
26
60,800
45,600
26
34,400
26,800
26
25,600
20,533
26
22,933
17,867
26
24,000
18,933
26
46,265
37,108
26
30,720
24,960
Frame
Relay
ATM
WAN
WAN
bandw
bandwi
idth
dth
(bps)
(bps)
102,400
127,200
83,200
106,000
76,800
84,800
46,400
84,800
27,200
42,400
20,800
28,267
18,133
26,571
19,200
28,267
37,590
50,600
24,960
33,900
Advertisement
Table of Contents
