Example Using Table A-7 Data For 32 Kbps - Lucent Technologies PacketStar PSAX Series User Manual

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

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Table A-7. Standard AAL2 Bandwidth Calculation

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.

Example Using Table A-7 Data for 32 Kbps

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

Data + Overhead

At 32 Kbps compression rate (from Table A-7): For sending 4,000 voice

samples (bytes) per second, including the AAL2 header in cells per second

(cps) in the calculation:

4,000 samples / 20 samples received from DSP x 23 bytes to be packed into

an AAL2 cell, where 23 bytes = 20 bytes of data in the cps packet and 3 bytes

for the cps-header.

With 47 data bytes in the AAL2 cell, the cell rate = 4600/47 ~= 98

The expected cell rate with silence is: 98/2 = 49.

The cell rates for Lucent nonmultiplexed AAL2 remain unchanged, as shown

in Table A-8.

Table A-8. AAL2 Non-Mutiplexed Transmission Rates

Compression Rate

Table A-9 shows the Standard AAL2 Bandwidth Calculation for ATM Forum

Minimum AAL2 Trunk Size Requirements Tables

Chapter A Reference Tables

cells/sec with

silence enabled