Nortel Networks NN43001-563 - Manual (Page 162)

162 ITG engineering guidelines
• As an interim measure, connect to each ITG-Pentium 24-port trunk
card and log in to the ITG> shell. In the shell, use the commands
tlanDuplexSet and tlanSpeedSet to configure the TLAN interface
to operate at half-duplex 10BaseT.
If the TLAN subnet is to operate at 10BaseT full-duplex, the TLAN network
interface must also be configured to operate at full-duplex. If this is not done,
a duplex mismatch is created. Packets are lost if the TLAN network interface
is unchanged from auto-negotiate or mistakenly configured for half-duplex.
Because of its high capacity, 100BaseT Ethernet generally does not
experience bottlenecks unless servicing a very large network.
WAN links are normally based on PSTN standards such as DS0, DS1,
DS3, SONET STS-3c, or Frame Relay. These standards are full-duplex
communication channels.
With standard PCM encoding (G.711 codec), a two-way conversation
channel has a rate of 128 kbit/s (64 kbit/s in each direction). The same
conversation on WAN, such as T1, only requires a 64 kbit/s channel,
because a WAN channel is a full-duplex channel.
When simplex/duplex Ethernet links terminate on the ports of an Ethernet
switch such as a Baystack 450, the fully duplex Ethernet up-link to the
router/WAN can be loaded to 60% on each direction of the link.
IP Trunk 3.01 (and later) DSP profile settings
Codec types
The following codecs can be configured with IP Trunk 3.01 (and later):
• G.711 (A-and Mu-law)
• G.729AB
• G.723.1
• G.729B
Voice Activity Detection (VAD) can be enabled or disabled for all of these
codecs using the TM 3.1 IP Trunk 3.01 (and later) interface.
Select from three DSP profiles on the IP trunk card. Profile 1 is the default
setting.
• Profile 1: G.711, G.729AB, Fax
• Profile 2: G.711, G.723.1, Fax
• Profile 3: G.711, G.729B, Fax
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.