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Packet voice network

Traditional voice networks are based on digital leased lines, including T1 and fractional T1. These are still

useful, and are an important component of current networks.

However, organizations can now deploy new networking conﬁgurations using the packet voice technology

built into the Alcatel OmniPCX Enterprise. These include the digital public switched telephone network using

ISDN / PSTN signaling; public and private IP networks; frame relay networks; and ATM networks.

ALCATEL 5 >

Distributed Systems and Networking

Packet voice network over ISDN

Traditional voice uses 64 Kbps for a single voice

call. With the Alcatel OmniPCX Enterprise

compression engine integrated in LIO (link

optimizer) boards, a single ISDN / PSTN 64 Kbps

channel can support up to eight voice calls

simultaneously.

• LIO B (serial data) provides one serial data

interface per board, X.24 / V.11 or V.36

native frame relay. Each LIO B board can

support up to four frame relay directions and

has eight integrated voice compression

channels.

• LIO X (auxiliary compression module) provides

eight additional voice compression channels

Characteristics:

• Automatic fax detection

• Using G.729A compression algorithm,

compression rate is 8 Kbps

• Using G.723.1 compression algorithm,

compression rate is 6.4 Kbps

• DTMF Q.23 codes interpreted, coded and

regenerated

• End-to-end compression / decompression

• G3 fax up to 4.8 Kbps

• Integrated echo cancellation

• Lost frame interpolation

• Mutual aid between compression resources

• Silence suppression and regeneration (VAD)

• Voice frame fragmentation (reducing delay)

• G.711 voice coding: 64 Kbps

Packet voice network over IP

The Alcatel OmniPCX Enterprise provides a

powerful communication capability across any IP

network, and more. By sending the full ABC

networking protocol across an IP network, almost

every feature that works in a single OmniPCX

Enterprise also works across a network. So, you do

more than reduce transmission costs. You create a

single transparent network of almost any size

across any distance.

Characteristics:

• Allocation of the compression algorithm

• Static

• Per bundle between Alcatel OmniPCX

Enterprise

• Automatic fax detection

• Call rerouting for new calls

• If there’s an IP network failure

• QoS problems (call by call)

• Using G.729A compression algorithm,

compression rate is 8 Kbps

• Using G.723.1 compression algorithm,

compression rate is 6.4 Kbps

• DTMF Q23 codes interpreted, coded, and

regenerated

• Dynamic jitter buffer

• Echo cancellation

• End to end compression / decompression

• Ethernet connectivity

• G3 Fax up to 4.8 Kbps

• Inter-node transit

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