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Annotation of Net2/netccitt/readme.hdlc, revision 1.1

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

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