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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: bygg@sunet.se

or

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Eriksson Informational [Page 2]