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July 19, 2004
SCP-PGCAB001-010-01H
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LOSSARY
A
ACU – Alarm and Control Unit
Adapter – Typically a nonattenuating fiber optic connector (a zero buildout). (Formerly called a coupler.)
Adapter Panel – Bulkhead, sometimes modular, used to mount adapters and buildouts. Usually means the part
unequipped with adapters or buildouts. (Sometimes called a coupler panel or connector panel.)
ADSL – Asynchronous Digital Subscriber Line
AIP – Alarm Interface Panel
B
Buildout – Attenuation inserted into a transmission/signal path (for example, order wire buildout or fiber optic
buildout). Fiber optic buildout is a coupler with attenuation.
Bulk Power – Preferred DC power architecture in which one set of rectifiers and batteries is shared by an entire
structure, as distinguished from Distributed Power; sometimes meant as including Bulk Ringing.
Bulk Ringing – Preferred ringing power architecture in which one set of ring generators is shared by many
transmission equipment modules; using implied as part of Bulk Power.
C
Central Office – Site of host transmission equipment and/or telephone switching equipment. The central office
may also be the location of the alarm monitoring system.
Channel Bank – Transmission equipment shelf which interfaces with customer lines via channel units.
Channel Unit – Service-specific plug-in, assigned to specific customer line(s).
CIC – Customer Information Center, location where Outside Plant documents are stocked and distributed.
CCS – Unit of DS0 traffic, specifically hundred call-seconds/hour (see Traffic Rate).
CO – Central Office
COT – Central Office Terminal, in Universal DLC only, the equipment that interfaces DS0 channels from the CO
switch to digital carrier for transport to the Remote Terminal.
Coupler – Typically a non-attenuating fiber optic connector, for example a zero buildout.
Coupling – Same as coupler.
Coupler Panel – Bulkhead, sometimes modular, used to mount couplers and buildouts. Usually means the part
unequipped with couplers or buildouts.
Cross-Connect – A wire-termination field that enables administration of telephony, alarm or other circuits with
jumper wires. FDI are examples of cross-connects.
D
DC ByPass Pair – Same as DC Test Pair
DC Test Pair – Circuit used to access customer DS0 circuits to test integrity from the CO, either over dedicated
outside plant twisted pair or via RMU and DS0 circuit.
Derived Pairs – DS0 circuits from a channel bank, also called Voice Frequency (VF) Pairs, although not always
analog.
Distribution – Cable running toward the customer from an RT, ONU, or FDI (see also Feeder).
Digital Pairs – DS0 circuits from a channel bank, also called Voice Frequency (VF) Pairs, although not always
analog. See DS1 or T1.
DS0 – Voice channel, specifically 64 kbit/s equivalent digital bandwidth. Bi-directional, typically carried on one
twisted pair.
ADC Telecommunications, Inc.
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