SCCS Switching Control Center System.
Service Group (SG) An ISLU2 has two Service Groups (SG) that operate
active/active to switch information in the Common Data Circuits
(2 per SG) to the appropriate paths. These paths are:
• The LIDBs to the LGCs.
• The PIDBs to the TSI (MCTU3).
Direct Connect PIDBs (DPIDBs) to the PSU2. The number of
PIDBs and DPIDBs is an engineered quantity, while each LGC
has two LIDBs.
Service Units Provide call processing and testing functions within the
switching module.
Session A cooperative relationship between two application entities
characterizing the communication of data between them.
SFID Secure Feature ID.
SLC
®
Carrier System The SLC carrier system provides duplex data link capability
simultaneously with voice usage on the existing subscriber voice
loops at data rates up to 4800 bps
SM Switching Module.
SMPU5 Switching Module Processor Unit Model 5.
SNA Systems Network Architecture (SNA) is the computer network
architecture developed by IBM.
STLWS Supplementary Trunk Line Workstation.
SU Software Update.
Switching Module The DRM switching module provides call-processing intelligence
and complete switching for intra-switching-module calls.
Switching Node A location in a network where switching takes place.
Synchronous A form of communications where characters or bits are sent in a
continuous stream with the beginning of one contiguous with
the end of the preceding one. Separation of one from another
requires the receiver to maintain synchronism to a master
timing signal. Abbreviated Sync.
Synchronous Data Link Control (SDLC)
IBM’s version of the ADCCP link control technique. A
full-duplex protocol developed by IBM.
Synchronous Time Division Multiplexing (STDM)
The combining of multiple inputs into a single narrow band
time divided output by a sampling technique that transmits all
inputs including idles.
Systems Network Architecture (SNA)
The computer network architecture developed by IBM.
T1 A digital transmission standard in North America that carries
traffic at the DS1 rate of 1.544 Mbps.
TAU Test Access Unit.
TDMS Traffic Data Management System.
GLOSSARY 235-200-150
May 2003
Page G-10 Issue 3.00
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