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WAN Terms and Acronyms
WPIM-S/T User’s Guide
C-5
Q.933-A
Q.933 Annex A, an ITU link management protocol
specification used in Frame Relay.
SDLC
Synchronous Data Link Control, layer 2 (link layer)
protocol developed by IBM for SNA connectivity. Basis
for HDLC.
SNA
Systems Network Architecture, data communication
network architecture developed by IBM in the 1970s.
SPID
Service Profile ID is a unique number that identifies the
characteristics of the ISDN line. One SPID number may
be assigned for each B channel of the ISDN BRI line, or
one SPID for both B channels, or no SPIDs depending on
the switch at the CO (Central Office).
spoofing
Technique used to remove poll and update service frames
from WAN links while ensuring that the network
continues to operate normally, used to minimize dial-up
connection time.
SVC
Switched Virtual Circuit. A connection across a network
established on an as-needed basis. The connection lasts
only for the duration of the transfer, and is the datacom
equivalent of a dialed phone call.
T1
A Bell System term that refers to the physical carrier
used to transmit a digital signal at 1.544 Mbps.
T1.617-D
T1.617 Annex D, an ANSI link management protocol
specification used in Frame Relay.
TDM
Time Division Multiplexing, a technique in which
separate data or voice signals are transmitted
simultaneously over a single communications medium
based on time interleaving.
timeslot
A standard 64,000 bit/second channel. Synonymous with
DS0 (Digital Signal, level 0).
WAN
Wide Area Network, a network spanning a large
geographic area.
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