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2. CPX-1000 Voice Services Platform Description 1000-A2-GN22-00
2-36 February 2003
Echo
Cancellation and
Compression
Module (ECAC)
The ECAC module can be used with the Octal T1 or STS-1 module
to provides compression from zero to 100% of calls on the CPX.
With compression, maximum capacity is 1,024 calls. When
ADPCM compression is used, samples are packed two per byte
(32 kbps) or four per byte (16 kbps).
“Voice Compression” refers to the industry standard compression
algorithm of voice data passed between the CPX and an IAD. Voice
data compression decreases the bandwidth used on the most
narrow pipe — the local loop — enabling additional voice calls
and/or increased performance in data communications.
ECAC Requirements
ADPCM32 and ADPCM16 support
Able to query compression capabilities
In a T1 setup, the last two slots available (usually 15 & 16)
In an STS-1 setup, the first two slots available (usually 1 & 3)
Figure 2–18. Echo Cancellation And Compression Card
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STATUS