HDLC

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HDLC

(communications)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

HDLC

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HDLC

(High-level Data Link Control) A data link protocol from ISO for point-to-point communications over serial links. Derived from IBM's SDLC protocol, HDLC has been the basis for numerous protocols including X.25, ISDN, T1, SS7, GSM, CDPD, PPP and others. Various subsets of HDLC have been developed under the name of Link Access Procedure (LAP).

In HDLC, one side is set up as the primary control station and the other as secondary. In Normal mode, the secondary station responds to requests only from the primary station. In Asynchronous mode, the secondary can initiate transmission, and in Asynchronous Balanced mode, both sides can send and receive over full-duplex lines. See LAP and SDLC.
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References in periodicals archive ?
In this study, it is aimed to determine effect of match program of 10 days and in chronic medium intensity on the Triglyceride, Cholesterol, HDL and LDL blood values.
"Triglycerides shouldn't get equal billing with cholesterol, HDL and LDL," says Rifkind.

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