RFC 2118 (rfc2118) - Page 2 of 9

Microsoft Point-To-Point Compression (MPPC) Protocol

RFC 2118                     MPPC Protocol                    March 1997


1.  Introduction


   The Microsoft Point to Point Compression scheme is a means of
   representing arbitrary Point to Point Protocol (PPP) packets in a
   compressed form. The MPPC algorithm is designed to optimize processor
   utilization and bandwidth utilization in order to support large
   number of simultaneous connections. The MPPC algorithm is also
   optimized to work efficiently in typical PPP scenarios
   (1500 byte MTU, etc.).

   The MPPC algorithm uses an LZ [3] based algorithm with a sliding
   window history buffer.

   The MPPC algorithm keeps a continous history so that after 8192 bytes
   of data has been transmitted compressed there is always 8192 bytes of
   history to use for compressing, except when the history is flushed.

1.1.  Licensing

   MPPC can only be used in products that implement the Point to Point
   Protocol AND for the sole purpose of interoperating with other MPPC
   and Point to Point Protocol implementations.

   Source and object licenses are available on a non-discriminatory
   basis from Stac Electronics. Please contact:

         Cheryl Poland
         Stac Electronics
         12636 High Bluff Drive,
         San Deigo, CA 92130
         Phone: (619)794-4534
         Email: 

1.2.  Specification of Requirements

   In this document, several words are used to signify the requirements
   of the specification.  These words are often capitalized.

   MUST      This word, or the adjective "required", means that the
             definition is an absolute requirement of the specification.

   MUST NOT  This phrase means that the definition is an absolute
             prohibition of the specification.







Pall                         Informational