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Annotation of Net2/netccitt/readme.hdlc, revision 1.1.1.1

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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