Cisco Systems 8600 Series B8ZS Bipolar with Eight Zero Suppression, Bandwidth reservation, Bframe

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

An IPX 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 control card for the BPX switch.

BC-E1 (Backcard E1)

E1 interface card used on IPX and IGX switches.

BC-E3 (Backcard E3)

E3 interface card used on IPX and IGX switches.

BC-J1 (Backcard J1)

J1 interface card used on IPX and IGX switches.

BC-SR (Backcard Subrate)

Subrate interface card used on IPX and IGX switches.

BC-T1 (Backcard T1)

T1 interface card used on IPX and IGX switches.

BC-T3 (Backcard T3)

T3 interface card used on IPX and IGX switches.

BC-Y1 (Backcard Y1)

Y1 interface card used on IPX and 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.

Glossary E-3