Cisco BPX 8600 Series, Installation And Configuration Manual

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Glossary
3
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
B
B3ZS (Bipolar with
Three Zero
Suppression) A protocol for T3 lines that converts a channel word with three consecutive zeros into a code which at
the far end is converted back to three zeros.
B8ZS (Bipolar with
Eight Zero
Suppression)
A T1 line protocol that converts a channel word with eight consecutive zeros into a code which, at the
far end, is converted back to eight zeros. Allows 64 Kbps clear channel operation while assuring the
ones density required on the T1 line.
bandwidth
reservation
A software feature that allows circuits to automatically become active (or “upped”) at a specified time
and date and downed at some later time and date. For circuits that do not need to be available 100% of
the time.
B channel
In ISDN, a full-duplex, 64-kbps channel used to send user data. Also known as the bearer channel.
Compare with D channel.
BCC
The switch control card in the BPX is the Broadband Control Card, with a 68040 processor..
BC-E1 (Backcard
E1)
E1 interface card used on IGX switches.
BC-E3 (Backcard
E3)
E3 interface card used on IGX switches.
BC-J1 (Backcard J1) J1 interface card used on IGX switches.
BC-SR (Backcard
Subrate) Subrate interface card used onIGX switches.
BC-T1 (Backcard
T1)
T1 interface card used on IGX switches.
BC-T3 (Backcard
T3)
T3 interface card used on IGX switches.
BC-Y1 (Backcard
Y1)
Y1 interface card used on IGX switches.
BDA (Bframe
Destination
Address) The address of the slot.port.channel for which the Bframe is destined. This address is part of the Bframe
header and is only used across the switch fabric locally in the node.
Bframe
The BPX frame is the 64-byte format for messages used to encapsulate ATM cells which are sent across
the switch fabric.
bipolar violations
Presence or absence of extra “1” bits on a T1 transmission facility caused by interference or a failing
line repeater. These extra or missing bits interrupts one of the rules for bipolar pairs of a digital
transmission line.
BISDN (broadband
ISDN)
ITU-T communication standards designed to handle high-bandwidth applications. Compare with
ISDN.
BNI (BPX Network
Interface Card)
The front card used to network BPX switches together and to connect to AXIS and IGX nodes
configured as shelves. Supports T-3, E-3, and OC3 trunks carrying ATM cells.