HDLC


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HDLC

(communications)

HDLC

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.
References in periodicals archive ?
1] Nonstandard abbreviations: EQA, External Quality Assessment; HDLC, HDL cholesterol; LDLC, LDL cholesterol; LNE, Laboratoire national de metrologie et d'essais.
Commutability results of 5 frozen serum pools prepared according toCLSI C37-A for HDLC and LDLC.
The dyslipidaemia tends to mimic that seen in IR, with hypertriglyceridaemia and low HDLC levels.
The HDLC core is immediately available as part of the FastChip library.
For hsCRP, unlike TC and HDLC where extensive precision information is available from CAP, the precision values used were based on a comprehensive performance evaluation on many currently fielded hsCRP assays (13).
A modified [beta]-quantification method for LDLC (LDL-u) and HDLC (HDL-u) measurements was performed in a subgroup of 442 subjects, similarly to methods described previously (12, 13, 26).
For more details regarding Mindspeed's HDLC products and the integrated solution, please visit http://www.
The FREEDM 84LE supports up to 84 T1, 63 E1 or 3 DS3/E3 links and up to 1024 HDLC channels and is targeted at nxDS3 and OC-3/STM-1 line card designs.
Axerra's solution offers the most comprehensive set of Pseudo-Wire services in the industry, including Circuit Emulation Pseudo-Wire with dynamic bandwidth options, Frame Relay and HDLC Pseudo-Wires, ATM Pseudo-Wires, Ethernet Pseudo-Wires, and Legacy + IP aggregation with Layer 2 separation providing security and QoS/COS over packet networks.
Both support industry standard telephony and data protocols, including Primary Rate ISDN (both North American and Standard Euro) protocol families for voice, PPP, Cisco, HDLC and Frame Relay data modes.