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- Network Working Group J. Eriksson
- Request for Comments: 1926 KTH NOC
- Category: Informational 1 April 1996
-
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- An Experimental Encapsulation of IP Datagrams on Top of ATM
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- 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"
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- Eriksson Informational [Page 1]
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- RFC 1926 IP over ATM 1 April 1996
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- 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
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- The above process is simply performed backwards.
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- Security Considerations
-
- The author assumes that the users take whatever precautions that are
- necessary before attempting to use this protocol in any crowded area.
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- Author's Address
-
- Johnny Eriksson
- KTH NOC
- EMail: bygg@sunet.se
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- Eriksson Informational [Page 2]
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