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APPENDIX C: WAN TERMS AND ACRONYMS

C-2 WPIM-T1 LOCAL MANAGEMENT GUIDE

DCE Data Communications Equipment, a device such as a modem

that connects the communications circuit with the end device

(see DTE).

Data (D)

Channel

A 16 Kbps channel used with BRI and PRI services for

signaling and control.

D4 D4 Framing, a popular framing format in T-1. Uses 12 T-1

Frames to identify both the channel and the signaling bit.

DLCI Data Link Connection Identiﬁer, a unique virtual circuit identi-

ﬁer used in Frame Relay. Identiﬁes a given frame as being

from a particular logical link. The DLCI has only local signiﬁ-

cance.

DSU Digital Service Unit, converts RS-232 or other terminal

interfaces to DSX-1 (T-1) interface.

DS-0 Digital Signal, level 0, a standard 64,000 bit/second channel.

Synonymous with “Timeslot.”

DTE Data Terminal Equipment, equipment that originates and

terminates data transmission such as a computer or printer

(see DCE).

E-1 European digital signal level 1. Similar to T-1 but provides 32

channels (2.048 Mbps) instead of 24 channels (1.544 Mbps).

ESF Extended Super Frame. A new T-1 framing standard (see D4

framing) that uses 24 T-1 frames, thus allowing individual

identiﬁcation of the channel and signaling bits.

Fractional T-1 Use of a portion (less than the full 24 channels) of a T-1 line.

Frame Relay A network protocol that allows for many point-to-point virtual

connections over a single access channel.

HDB3 High Density Bipolar 3, used with E-1, a bipolar coding

method that does not allow more than 3 consecutive zeros.

HDLC High-Level Data Link Control, layer 2 (link layer) full-duplex

protocol derived from SDLC.

INV. HDLC A form of zero suppression in which all zeros in the HDLC

packet are changed to ones and all ones are changed to zeros.

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Cabletron Systems BRIM-E6 Spezifikationen Seite 43