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July 19, 2004
SCP-PGCAB001-010-01H
MLT – Mechanized Loop Testing, a common method for remotely testing the integrity of twisted pair telephony
circuits between the RT and the customer location.
MM – Multimode, optical fiber type that allows a large number of optical modes of propagation.
MUX – Multiplexer—Typically refers to an optical multiplexer, such as the Lucent WaveStar ADM 4/1.
N
NC – Normally Closed
NEBS – Network Equipment Building Services
NID – Network Interface Device
NO – Normally Open
O
OC1 – Slowest rate SONET format, optical equivalent of one STS1E, one DS3, 28 DS1s or 672 DS0s.
OC3 – Next-higher-speed commonly-used SONET format after OC1, equivalent to three OC1, 84 DS1s, or 2016
DS0s.
OC12 – Next-higher-speed commonly-used SONET format after OC3, equivalent to four OC3, twelve OC1, 336
DS1s, or 8064 DS0s.
OLIU – Optical Line Interface Unit
Order Wire – Dedicated twisted pair circuit, linking many RTs in a daisy-chain, for direct craft communication to
CO.
OSP – Outside Plant
Overhead – Usually refers to Overhead Telemetry (see Telemetry).
P
POTS – Plain Old Telephone Service, basic service as distinguished from special services; with bi-directional
transmission over one twisted pair.
Protection – Redundancy, also called "Protect", typically for transmission circuits or circuit packs, generally
required for electronics serving 48 or more customers.
2. Electrical overvoltage/overcurrent devices ("Protectors") used to guard electronics from lightning surges and
accidental utility power connection to outside plant cables.
PWB – Printed Wiring Board
R
Rectifier – AC-to-DC converter, with output typically connected in parallel with battery backup
RMU – Remote Measurement Unit, accesses the DC Test interface to RT channel banks in response to
commands from the CO transmitted over a dedicated DS0 channel.
RT –Remote Terminal, the equipment that interfaces DS0 channels from the customer equipment (e.g.
telephones) to digital carrier for transport to the CO.
Ring Generator – Sometimes called a Ringer, a power supply which provides a constant source of Ringing that
may be accessed by channel units.
Ringer – A Ring Generator. The sound-generating device for a telephone.
S
SDH – Synchronous Digital Hierarchy, the current European standard signal rates and formats for digital
transmission, adopted and renamed by Telcordia as SONET.
SD – Schematic Drawing
SM – Singlemode, fiber type with a core diameter in which only a single mode, the fundamental mode, is capable
of propagation
ADC Telecommunications, Inc.
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