Appendix E - Glossary

LTPH-UM-1234-01

 

 

APPENDIX E - GLOSSARY

2B1Q

Two-Binary, One-Quaternary. Line coding used for HDSL.

AIS

Alarm Indicator Signal

 

American Wire Gauge. The standard used to describe wire size. The diameter

AWG

of the wire increases as the gauge decreases. 26 gauge is 0.188 inches

 

(4 mm) in diameter, 24 gauge is 0.241 inches (51 mm), and so on.

BBS

Bulletin Board System

Bridged Tap

A pair of wires connected in parallel across a single line to form a “T”

configuration.

 

Cable Binder

A group of 25 pairs of wires.

Group

 

CAP

Capacitor

CDU

HDU to Customer loopback

CO

Central Office

COLU

Central Office Line Unit

COT

Central Office Terminal

CRC

Cyclic Redundancy Check

CSA

Carrier Serving Area/Customer Service Area

DDS

Digital Data Service

FIL

Filter

GFD

Ground Fault Detection

HCDS

High Capacity Digital Service

HDSL

High-bit-rate Digital Subscriber Line

HDU

HiGain Doubler Unit

HLU

HiGain Line Unit

34

April 30, 2003

HDU-409 Lists 1, 2, and 3