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- NETWORK WORKING GROUP Richard W. Watson
- Request for Comments #196 SRI-ARC
- NIC 7141 July 20, 1971
- Categories: A.5, D.7
- Obsoletes: none
- Updates: none
-
- A MAIL BOX PROTOCOL
-
- The purpose of this protocol is to provide at each site a
- standard mechanism to receive sequential files for immediate or
- deferred printing or other uses. The files for deferred printing
- would probably be stored on intermediate disk files, although
- details of how a file is handled, stored, manipulated, or printed
- at a site are not the concern of this protocol.
-
- It is also assumed that there would be a program at the sending
- site which sends the file in the format given below with the
- optional control codes when appropriate. This program could
- probably be accessed as a subcommand of the Telnet program.
-
- The motivation for developing this protocol is the Network
- Information Center's (NIC) need to be able to deliver messages
- and documents to remote sites, and to be able to receive
- documents for cataloging, redistribution, and other purposes from
- remote site without having to know the details of path name
- conventions and file system commands at each site. Multiple mail
- boxes (128) are allowed at each site and are identified as
- described below. The default is mail box number 0 for use with
- the standard mail printer defined below.
-
- A mail box, as we see it, is simply a sequential file to which
- messages and documents are appended, separated by an appropriate
- site dependent code.
-
- Although this protocol will enable people to transmit messages
- directly without going through the NIC, we want to encourage
- people to use the NIC as much as possible, so that dialogue will
- be recorded, cataloged and available for viewing online at NIC,
- using the powerful facilities of the ARC on Line System (NLS).
-
- The Mail Box Protocol will use established network conventions,
- specifically the Network Control Program, Initial Connection
- Protocol, and Data Transfer Protocol, NIC 7104.
-
- The normal transmission is to be full 7-bit ASCII in 8-bit bytes,
- the high order bit set to zero.
-
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- [Page 1]
-
- A MAIL BOX PROTOCOL RFC 196 NIC 7141
-
- The standard receiving mail printer for mail box number 0 is
- assumed to have a print line 72 characters wide, and a page of 66
- lines. The new line convention will be carriage return (X'OD')
- followed by line feed (X'OA') as per the Telnet Protocol RFC 158,
- NIC 6768. The standard printer will accept form feed (X'OC') as
- meaning move paper to the top of a new page.
-
- It is the senders responsibility to control the length of the
- print line and page. If more than 72 characters per line are sent
- or if more than 66 lines are sent without a form feed, than the
- receiving site can handle these situations as appropriate for
- them. These conventions can be changed by control codes as
- described below.
-
- A message or document being sent to any mail box is a string of 8
- bit bytes.
-
- At the head of the message or document sent to mail box number 0
- there is to be an initial address string terminated by a form
- feed. This address string is to contain the sender's name and
- address, and the receiver's name and address formatted in some
- reasonable, easy-to-read form for a clerk to read and distribute.
- Comments could also be included in the address string.
-
- The format of information in mail boxes other than mail box
- number 0 is not explicitly defined by this protocol.
-
- Initial Connection
-
- Initial Connection will be as per the Official Initial
- Connection Protocol, Documents #2, NIC 7101, to a standard
- socket not yet assigned. A candidate socket number would be
- socket #5.
-
- Data Transmission
-
- Data Transmission will be as per the Data Transfer Protocol,
- RFC 171, NIC 6793. That is, there will be a Modes Available
- handshake, and then transmission of special control
- information and data. A message or document is defined to be a
- block of data. Control information is to be global. That is,
- once a control mode is set it is assumed to apply during the
-
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- [Page 2]
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- A MAIL BOX PROTOCOL RFC 196 NIC 7141
-
- life of the connection unless explicitly changed. More than
- one document may be sent during the life of the connection
- unless the infinite bit stream mode is used. In the latter
- case there will be one message or document per connection. A
- reasonable convention for control information sent using the
- infinite bit stream mode seems to be to assume that is applies
- only to the next data stream connection from the host which
- sent the control stream.
-
- Control Information
-
- The sending process should be capable of allowing the user to
- indicate the control codes associated with the transmission of
- a mail item. The control codes can be used with any mail box
- number.
-
- Mail Box Number
-
- A site may find, as is the case at NIC, that it is useful
- to have more than one receiving mail box, each to be
- associated with a different process.
-
- The mail box number for material to be printed by the
- standard mail printer is mail box number 0 and is used by
- default.
-
- Code X'DO'
-
- Meaning: A seven bit binary number in an eight bit field
- with the high order bit set to zero is to follow
- indicating the receiving mail box number.
-
- Transmission Code Type
-
- The default code type is 7-bit ASCII in an 8 bit field,
- high order bit to zero.
-
- 'Code X'AO'
-
- Meaning: A Data Type signal indicating that the
- transmission code is 7-bit ASCII in an 8-bit field, high
- order set to zero.
-
-
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- [Page 3]
-
- A MAIL BOX PROTOCOL RFC 196 NIC 7141
-
- Code X'A1'
-
- Meaning: Transparency, i.e. a stream of 8 bit bytes.
-
- Code X'A2'
-
- Meaning: EBCDIC
-
- Other character codes could be added in the future.
-
- Printer Control Codes
-
- The default settings are a print line of 72 characters and
- a print page of 66 lines.
-
- Code X'D1
-
- Meaning: Set line width to 72 characters.
-
- Code X'D2'
-
- Meaning: Use the full width of your printer.
-
- Code X'D3'
-
- Meaning: Set page size to 66 lines.
-
- Code X'D4'
-
- Meaning: Set page size to infinite.
-
- Other virtual printer control codes can be added in the
- future.
-
- Other classes of control codes can be added as the need
- arises.
-
-
-
- [ This RFC was put into machine readable form for entry ]
- [ into the online RFC archives by BBN Corp. under the ]
- [ direction of Alex McKenzie. 12/96 ]
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- [Page 4]
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