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SCP-PGCAB001-010-01H
July 19, 2004
SLC – LUCENT product name for digital loop carrier transmission systems, stands for Subscriber Loop Carrier (for
example, SLC 96, SLC Series 5, SLC 2000).
SONET – Synchronous Optical Network, consists of OCx optical signal formats of SDH.
Specials – Special service lines or special service channel units, as distinguished from POTS (for example, coin,
data, ISDN).
T
T1 – Lowest speed digital carrier, approx. 1.5 Mb/s, using 130 V amplitude to counteract voltage drop over long
distances.
Telemetry – Usually refers to transmitting of alarm and status information by an embedded data channel
multiplexed into a digital bit stream.
Tip and Ring – 1. Historical designations for conductors of standard 2-wire telephone circuits.
2. Standard designations incorporated in naming of conductors of any paired wire telephony circuit
Traffic Rate– Measure of percentage of DS0 lines in use for given system; expressed in units of hundred call-
seconds/hr or CCS, where 36 CCS = 100% of lines off-hook.
U
Uuncontrolled Environment – In thermal and humidity terms: without active heating or air-conditioning and thus
subject to the normal range of outdoor conditions. Electronics must generally be hardened for use in such an
environment.
In safety (for example, UL) terms: a building or space in a building that is accessible by untrained personnel.
V
VF – Voice Frequency, refers to analog DS0 services, often used to mean any DS0 service (see Derived Pairs).
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ADC Telecommunications, Inc.
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