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PVC
permanent virtual circuit. A frame relay logical link, whose endpoints and class of
service are defined by network management. Analogous to an X.25 permanent
virtual circuit, a PVC consists of the originating frame relay network element
address, originating data link control identifier, terminating frame relay network
element address, and termination data link control identifier. Originating refers
to the access interface form which the PVC is initiated. Terminating refers to the
access interface at which the PVC stops. Many data network customers require a
PVC between two points. Data terminating equipment with a need form contin-
uous communion use PVCs. See also DLCI.
remote configuration
A feature designed into ADTRAN DSU/CSU products that allow remote DSU/
CSU to be configured from a local DSU/CSU or VT 100 compatible terminal.
router
A device that supports LAN-to-LAN communications. Routers may be
equipped to provide frame relay support to the LAN devices they serve. A
frame-relay-capable router encapsulates LAN frames in a frame relay frames
and feeds those frame relay frames to a frame relay switch for transmission
across the network. A frame-relay-capable router also receives frame relay
frames from the network, strips the frame relay frame off each frame to produce
the original LAN frame, and passes the LAN frame on to the end device. Rout-
ers connect multiple LAN segments to each other or to a WAN. Routers route
traffic on the Level 3 LAN protocol (e.g., the internet protocol address). See also
bridge.
SDLC
synchronous data link control. A link-level communications protocol used in an
international business machines (IBM) systems Network Architecture (SNA)
network that manages synchronous, code-transparent, serial information trans-
fer over a link connection. SDLC is a subset of the HDLC protocol developed by
ISO.
service
The provision of telecommunications to customers by a common carrier, admin-
istration, or private operating agency, using voice, data, and/or video technolo-
gies.
61200208L1-1
Express 5210 User Manual
Appendix D. Glossary
D-7
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