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Appendix E - Glossary LTPH-UM-1234-01
34 April 30, 2003 HDU-409 Lists 1, 2, and 3
APPENDIX E - GLOSSARY
2B1Q Two-Binary, One-Quaternary. Line coding used for HDSL.
AIS Alarm Indicator Signal
AWG
American Wire Gauge. The standard used to describe wire size. The diameter
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
Group
A group of 25 pairs of wires.
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