Network Working Group                                        J. ErikssonRequest for Comments: 1926                                       KTH NOCCategory: Informational                                     1 April 1996      An Experimental Encapsulation of IP Datagrams on Top of ATMStatus 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     -... -.-- --. --. @ ... ..- .- . - .-.-.- ... .Eriksson                     Informational                      [Page 2]