Cisco BPX 8650, Installation And Configuration Manual

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GL-1
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
G L O S S A R Y
A
A-bit
active bit.
The bit in the frame relay frame header that indicates the status of the far end user device and the status
of the PVC segment in the foreign network.
A-law
An analog to digital encoding scheme used to convert voice samples to an 8-bit data word used in CEPT
E1 multiplex equipment.
See also
µ
-law.
ABR
available bit rate.
ATM connection type for bursty traffic, such as data. Provides closed loop control of service rate that
allows connections to use additional bandwidth when available. ABR may be used with ATM Traffic
Management 4.0 standards VS/VD flow congestion control, or with the proprietary ForeSight flow
congestion control.
See also CBR and VBR.
ACO
alarm cut off.
A switch to turn off the audible alarm outputs from a node while leaving the visual alarm outputs
unchanged.
active bit
See A-bit.
ADPCM
adaptive differential pulse code modulation.
A compression method that samples voice 8,000 times per second, and uses the changes between
samples as the basis for compression. Increases the capacity of a T1 line from 24 to 48 channels.
ADTF
allowed cell rate decrease factor.
Time permitted between sending RM cells before the rate is decreased to ICR.
adaptive
differential pulse
code modulation
See ADPCM.
adaptive voice
An optional feature that disables VAD from connections using it whenever there is excess bandwidth
available to allow the normal encoded voice to be carried on the packet line.
See also VAD.
alarm cut off
See ACO.
alarm relay
interface card
See ARI.
alarm relay module
See ARM.
alarm/status
monitor cards
See ASM.