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Reference Guide C-1
Appendix C
Glossary
C.1 Introduction
This Appendix lists the glossary of terms used in the telecommunications industry today.
AAL
ATM Adaption Layer
ABCD bits
The bits that carry signaling information over a T1 or E1 line.
ABR
Available Bit Rate
ACAMI
Alternate Channel AMI, transmitting data on every other DS0 in a DS1 to ensure ones-density.
ACO
Alarm Cutoff
ADPCM
Adaptive Differential Pulse Code Modulation
ADPCM Card
A resource card used to compress voice or subrate data on a DS0.
ADSL
Asymmetric Digital Subscriber Line
aggregate
A single bitstream combining many bitstreams of lower rates.
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