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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.

HDLC - High-level Data Link Control


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For communication, industrial, and office automation (OA) applications, the added HDLC communication function is particularly important because it can implement fast, highly reliable data transfers between system elements.
Renesas Technology expands M16C family product line by EDP Weekly's IT Monitor
Mindspeed's highly integrated, 1,024 multi-channel HDLC controller used in conjunction with its high-density BAM and multi-port T3/E3 LIU devices enable Huawei-3Com to develop a high-density, software configurable datacom router.
Huawei-3Com Selects Multiple Mindspeed(R) Transmission Devices for ... by Business Wire
In addition, iWARE protocol modules are offered for ATM AAL5, ATM AAL2, SS7 MTP1/2, Frame Relay, PPP, HDLC and IP/Ethernet, along with convergence layer software for third party protocol stacks, such as Hughes Software Systems.
INTERPHASE: ENHANCED SOFTWARE DEV SUITES TO ASSIST WITH NEXT GEN I/O ... by EDP Weekly's IT Monitor
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