1
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
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 VSVD 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.
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.)
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.
AIT-E3 (ATM
Interworking Trunk
E3 Interface Card)
The AIT-E3 backcard provides an E3 interface for the BTM (IGX switch) ATM trunk cards.
AIT-T3 (ATM
Interworking Trunk
T3 Interface Card)
The AIT-T3 backcard provides a T3 interface for the BTM (IGX switch) ATM.
alternate routing
An automatic rerouting of a failed connection by a node to a new route through the network to maintain
service.
AMI (Alternate
Mark Inversion)
The line code used for T1 and E1 lines where the “1s” or “marks” on the line alternate between positive
polarity and negative polarity.
arbiter
A BPX administration processor that polls each network port to control the data flow in and out of the
crosspoint switch matrix.
ARI (Alarm Relay
Interface Card)
An alarm interface back card for the IGX switches.
Содержание BPX 8600 Series
Страница 43: ...P A R T 1 The BPX Switch ...
Страница 44: ......
Страница 151: ...P A R T 2 Installation ...
Страница 152: ......
Страница 261: ...P A R T 3 Initial Configuration and Network Management ...
Страница 262: ......
Страница 291: ...P A R T 4 Configuring Connections ...
Страница 292: ......
Страница 481: ...P A R T 5 Troubleshooting and Maintenance ...
Страница 482: ......
Страница 531: ...P A R T 6 BPX Specifications ...
Страница 532: ......
Страница 563: ...P A R T 7 Appendices ...
Страница 564: ......
Страница 624: ...Glossary 24 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...
Страница 630: ...Index 6 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...