DEFINITIONS

2-WIRE

4-WIRE

ALTERNATING CURRENT

CENTRAL OFFICE

DIRECT CURRENT

DIGITAL SIGNAL LEVEL 3 T-CARRIER (ALSO CALLED T3) = 28 DS1 CHANNELS

2-PORT

FOREIGN EXCHANGE OFFICE, RJ-11 CONNECTION TO PSTN CO OR PBX INTERFACE

HIGH BIT RATE DIGITAL SUBSCRIBER LINE (4-WIRE)

HIGH-VOLTAGE

INTERFACE

INTERMEDIATE REACH

'OPTICAL ACCESS UNIT' OR 'OFFICE ALARM UNIT'

OPTICAL CARRIER LEVEL 12 UP TO 622MBIT/S, SONET EQUIVALENT TO SDH STM-4

OPTICAL CARRIER LEVEL 3 UP TO 155MBIT/S, SONET EQUIVALENT TO SDH STM-1

OC-12 OPTICAL ACCESS DS1 MULTI-SERVICE PLATFORM

PACKET-OVER-SONET

PLAIN OLD TELEPHONE SERVICE

4-PORT

REMOTE TERMINAL

STANDARD CONNECTOR, FIBER CONNECTOR WITH SQUARE SNAP COUPLING (PUSH-PULL)

SERIAL INPUT/OUTPUT

SINGLE-MODE

SYNCHRONOUS OPTICAL NETWORK, MULTIPLEXING PROTOCOL IN THE U.S. AND CANADA

DIGITAL SIGNAL 1 (DS1, ALSO CALLED T1) IS A T-CARRIER SIGNAL DEVISED BY BELL LABS

HIGH-SPEED OC3/OC12/OC48 ADM UP TO 12 STS-1 BANDWIDTH, 19IN & 23IN

HIGH-SPEED OC3/OC12/OC48 ADM UP TO 12 STS-1 BANDWIDTH, 23IN