WAN Terms and Acronyms
PLB — Payload Loop Back, ESF loopback including the facilities datalink.
Point of Presence — The point between the carrier provided equipment and services and the customer provided equipment and services.
PPP—
PRI — Primary Rate Interface, an ISDN service providing 23 “B” (Bearer) channels of 64 Kbps and one 64 Kbps “D” (Data) channel for signaling and control.
PVC — Permanent Virtual Circuit, a virtual circuit that provides the equivalent of a dedicated private line service.
RAI — Remote Alarm Indicator, is declared in
SDLC — Synchronous Data Link Control, layer 2 (link layer) protocol developed by IBM for SNA connectivity. Basis for HDLC.
SEFS — Severely Errored Framing Seconds, is a second with one or more OOF errors or a detected incoming AIS.
SNA — Systems Network Architecture, data communication network architecture developed by IBM in the 1970’s.
T1 — A Bell System term that refers to the physical carrier, or system of transmission media and regenerators, used to transmit a digital signal at 1.544 Mbps.
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).
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