Network Working Group                                        J. Eriksson
Request for Comments: 1926                                       KTH NOC
Category: Informational                                     1 April 1996


     An Experimental Encapsulation of IP Datagrams on Top of ATM

Status of this Memo

  This memo provides information for the Internet community.  This memo
  does not specify an Internet standard of any kind.  Distribution of
  this memo is unlimited.

Abstract

  This RFC describes a method of encapsulating IP datagrams on top of
  Acoustical Transmission Media (ATM).  This is a non-recommended
  standard.  Distribution of this memo is unnecessary.

Overview

  The modern laptop computer of today often contains the hardware
  needed to perform wireless communications by using Acoustical
  Transmission Media, i.e. sound waves.  Until this moment there has
  been no standard on how to run IP on such media.  This document is an
  attempt to fill this silence.

Frame transmission

  The IP datagram is divided into four-bit chunks, in network beep
  order, and converted to characters according to the table below.  A
  single "b" character is prepended as a frame start signal, the
  characters are then transmitted in ordinary morse code by modulating
  a steady tone on and off.  The frequency of this tone is also known
  as the Acoustical Signature (AS number) of the sender.

       Bits    Character       Bits    Character

       0000    "i"             1000    "u"
       0001    "t"             1001    "m"
       0010    "s"             1010    "v"
       0011    "a"             1011    "f"
       0100    "n"             1100    "w"
       0101    "h"             1101    "l"
       0110    "d"             1110    "k"
       0111    "r"             1111    "g"





Eriksson                     Informational                      [Page 1]

RFC 1926                      IP over ATM                   1 April 1996


  To allow more than one Local Acoustical Network (LAN) to coexist the
  use of different AS numbers for different LANs is suggested.  This
  document proposes seven standard AS numbers to be used, see the table
  below for details.

       Name   Frequency

       "a"     440 Hz
       "b"     494 Hz
       "c"     523 Hz
       "d"     587 Hz
       "e"     659 Hz
       "f"     698 Hz
       "g"     784 Hz

  It is assumed that for normal operation AS number "a", 440 Hz will be
  used.

Frame reception

  The above process is simply performed backwards.

Security Considerations

  The author assumes that the users take whatever precautions that are
  necessary before attempting to use this protocol in any crowded area.

Author's Address

  Johnny Eriksson
  KTH NOC
  EMail: [email protected]

  or

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