The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netccitt/README.hdlc

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    1 /*      $NetBSD: README.hdlc,v 1.5 2003/01/04 23:43:06 wiz Exp $        */
    2 
    3 /*
    4  * Copyright (c) University of British Columbia, 1984
    5  *                                                                          
    6  * @(#)README.hdlc      8.1 (Berkeley) 6/10/93
    7  *
    8  *  X.25 HDLC DATA LINK LEVEL:                                           
    9  *
   10  *                                                                            
   11  *  This module implements the Link  Level of the Open Systems Interconnect
   12  *  Model.  The implementation  is based  on the ISO  High-Level  Data Link 
   13  *  Control (HDLC).  These procedures  subscribe to the  principles  of the 
   14  *  ISO-Class of Procedures for  point-to-point. These procedures implement
   15  *  two-way  asynchronous balanced mode (LAPB) as recommented by the CCITT.
   16  *
   17  *  The HDLC protocol layer interface consists of the following procedures:
   18  *    Hd_init       (pr_init) 
   19  *    Hd_output     (pr_output)
   20  *    Hd_input      (pr_input)
   21  *    Hd_timer      (pr_slowtimo)                       
   22  *             
   23  *  Note: Supervisory commands RR, RNR and REJ are  not transmitted by this
   24  *        station.
   25  *     
   26  *        This station never enters a busy (RNR) condition.
   27  *              
   28  *        The "Generate_rr" variable can  be set to FALSE.  This means that
   29  *        we NEVER  send an RR.  This works just fine if  the network level
   30  *        is X.25 packet protocol -- which it is.
   31  *
   32  *        Currently, this is only a DTE implementation.
   33  *
   34  *  Think about:
   35  *        If the remote is busy, no iframes are sent. The remote sends a RR
   36  *        to clear this condition. However, this RR may be damaged, causing
   37  *        a possible deadlock. A solution is to poll with iframe (P(S)==P(R)
   38  *        of RNR) indefinitly.
   39  *
   40  *
   41  *  Date:             February 1984
   42  *
   43  *  Author:           Gerald W. Neufeld
   44  *                     
   45  *  Installation:     Department of Computer Science
   46  *                    University of British Columbia
   47  *                    Vancouver, BC, CANADA.
   48  *
   49  *  History:
   50  *  
   51  *                                                                      
   52  */

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