Itg Card Cpu Resources; Codecs - Nortel Meridian ITG Line 2.0 Description, Installation And Operation Manual

ITG card CPU resources

Codecs

ITG Line 2.0/i2004 Internet Telephone Description, Installation, and Operation
Meridian 1 capacity engineering guidelines
Each ITG Line 2.0 card requires 24 physical TNs. You configure the physical
units in Overlay 14.
The i2004 Internet Telephones share the CPU resources of the ITG cards.
Each i2004 Internet Telephone is controlled by one of the ITG Line 2.0 cards.
Up to 96 i2004 Internet Telephones can be registered with a single ITG card.
i2004 Internet Telephones can call other i2004 Internet Telephones like any
other telephone on the Meridian 1. In i2004 to i2004 calls, the voice media
stream is carried by IP packets directly between the sets over the IP network.
On a traditional telephone, the tones are generated by Meridian 1. The i2004
Internet Telephone can generate tones that originate on the original switch, so
the tones do not suffer from distortion caused by IP network compression.
The i2004 Internet Telephone and ITG Line 2.0 card support different codecs
and codec parameters with different compression rates and audio quality. The
Meridian 1 selects the appropriate codecs based on user-configurable
parameters. For instance, within a LAN an i2004 Internet Telephone-to-i2004
Internet Telephone call can be set up using G.711 at 64 Kbps. For an i2004
Internet Telephone-to-i2004 Internet Telephone call over a WAN, the call can
be set up using G.729B at 8 Kbps.
The Terminal Proxy Server (TPS) and Meridian 1 have a predefined table of
up to 32 codecs that can be supported. The first entry in the table has the
highest quality audio and requires the largest bandwidth. The last entry
requires the least bandwidth, with some qualifications.
When an i2004 Internet Telephone or gateway DSP comes on-line, it
determines which of the codecs it supports. This information is provided to
the Meridian 1 as part of the i2004 Internet Telephone registration sequence.
For more information about the registration sequence, turn to "Configuration
of the DHCP server" on page 97. The Meridian 1 uses this information to set
up a speech path to select a Codec that both endpoints support. As part of zone
management, it further selects the Codec based on whether it is trying to
optimize quality or bandwidth.
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