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APPENDIX C: WAN TERMS AND ACRONYMS

C-4 WPIM-T1 LOCAL MANAGEMENT GUIDE

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 1970’s.

T-1 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 speciﬁ-

cation used in Frame Relay.

TDM Time Division Multiplexing, a technique in which separate

data or voice signals are transmitted simultaneously over a sin-

gle communications medium based on time interleaving.

Timeslot A standard 64,000 bit/second channel. Synonymous with DS-0

(Digital Signal, level 0).

WAN Wide Area Network, a network spanning a large geographic

area.

WPIM WAN Physical Interface Module, Cabletron Systems modules

that provide connectivity/functionality for WAN modules such

as the BRIM-W6.

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Cabletron Systems BRIM-E6 Especificaciones Pagina 45