Fax Relay Using Aal2 Requirements; Module Alarm Status Table - Lucent Technologies PacketStar PSAX Series User Manual

1-port channelized sts-1e, t1 format module

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Table of Contents

Chapter A Reference Tables

Table A-9. Standard AAL2 Bandwidth Calculation for ATM Forum Profile 6

Rate (in Kbps)

* If a trunk has at least one active channel, a cell must be sent out every 20 msec; therefore, the minimum AAL2 trunk

size is 50 cps.

† This rate is the same as the ITU Standard.

Fax Relay Using AAL2 Requirements

Table A-10. Standard AAL2 Bandwidth Calculation for Fax Relay Mode on the DSP2C Module

Rate (in Kbps)

Module Alarm Status Table

1-Port Channelized STS-1e, T1 Format Module User Guide, Issue 1

Data + Overhead

Table A-10 shows the cell rate for fax relay modulation/demodulation.

Changing rates of 8 Kbps to 14.4 Kbps fax requires an additional 14 cells/sec.

Changing rates of 8 Kbps to 12.0 Kbps fax requires an additional 8 cells/sec.

Changing rates of 8 Kbps to 9.6 Kbps fax requires an additional 1 cell/sec.

Fax relay mode contains 20 msec of data for every CPS packet, so the cell rate

is more efficient than for voice codec.

The change in bandwidth is controlled by the DSP host code. If insufficient

bandwidth is available on the AAL2 trunk, the fax will be forced to a lower

rate. DSP resources must be available or the fax will fail. In addition, fax

modem bypass or fax relay/modem bypass is supported if enough bandwidth

is available on the AAL2 trunk.

Data + Overhead

1800/(36*39)

1500/(30*33)

1200/(24*27)

The Alarm Status field on the Equipment Configuration window displays the

current status of all PacketStar I/O, server, and common equipment modules

cells/sec with

silence enabled

cells/sec with

silence enabled