Cabletron Systems BRIM-E6 Specifications download pdf (Page 42)

WPIM-T1 LOCAL MANAGEMENT GUIDE C-1

APPENDIX C

WAN TERMS AND ACRONYMS

This appendix provides deﬁnitions for WAN terms and acronyms.

AMI Alternate Mark Inversion, line coding used with both E-1 and

T-1. A digital 1 is encoded as a “mark” (pulse) and a 0 is

encoded as a “space.” The marks alternate polarity.

ANSI American National Standards Institute, the US member of the

ISO.

Bearer (B)

Channel

A 64 Kbps channel used with BRI and PRI ISDN services.

Bipolar

Violation

The occurrence of two successive pulses of the same polarity

in a bipolar signal.

B8ZS Binary 8-Zero Substitution, line coding utilized with ESF

(Expanded Super Frame). Insures the ones density requirement

for digital T-carrier facilities in the public network, while

allowing 64 Kbps clear data per channel.This encoding method

is not supported by some Telcos.

BRI Basic Rate Interface, minimum rate ISDN subscriber interface,

provides 2 B + 1 D channels (two 64 Kbps “B” (Bearer) chan-

nels and one 16 Kbps “D” (Data) signaling channel for a total

of 144 Kbps).

BRIM Cabletron Systems Bridge Router Interface Module. Expands

the physical connectivity of a host device.

CRC Cyclic Redundancy Check, an algorithm or process used to

identify corrupted packets in the transmission link.

CSU Channel Service Unit, a device that terminates the local

loop/digital channel on a customer’s (DSU) premises. The

CSU connects to a DSX-1 interface on the CPE.

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Cabletron Systems BRIM-E6 Specifications Page 42