NETRJT: Remote Job Service Protocol for TIPS
RFC 283

Document Type RFC - Unknown (December 1971; No errata)
Updates RFC 189
Last updated 2013-03-02
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NETWORK WORKING GROUP                                         R. T. BRADEN
REQUEST FOR COMMENTS #283                                     UCLA/CCN
NIC #8165                                                     DECEMBER 20, 1971
CATEGORIES: D
OBSOLETES: NONE
UPDATES: RFC #189

             NETRJT -- Remote Job Service Protocol for TIPS
             ----------------------------------------------

A.  INTRODUCTION
    ------------

 TIP's have very limited processing capability; their function is
mainly limited to interfacing printer-keyboard devices to the Network
using TELNET protocol. It will also be possible to have a tape drive
on a TIP, using a subset of the count form of DTP (see RFC #264).
However, TIP's cannot and will not support either DTP or FTP (see RFC
#265) in general. Therefore, TIP users are excluded from using any
existing remote job entry protocol (e.g. CCN's NETRJS - see RFC #189).

 It appears, however, that it may be feasible in the future to use
TIP's for remote job entry in one or more of the following three ways:

 (a)  Attach local card readers, line printers, and card punches
      directly to TIP ports. These devices would use a TELNET-like*
      format and frame their characters with Start/Stop bits.  BBN
      can now supply a suitable 200 LPM printer, and is searching for
      suitable readers and punches.

 (b)  Connect a remote batch terminal to a full-duplex TIP port via
      a communication line. BBN is looking into this.

 (c)  Use the tape drive, and do card-to-tape and/or tape-to-print
      on another computer.

 BBN hopes to make case (b) look exactly like (a) to the server host.
That is, the remote batch terminal will send to and receive from the
server in a TELNET-like format*; the printer, card reader, punch, and
operator console connections will all use different sockets but one
hardware port at the TIP, which will map multiple sockets into the one
port.

NOTE:  By "TELNET-like format", we mean: (a) _CR_LF_ used to delimit
       logical records (lines or cards), and (b) the ASCII or EBCDIC
       format effector control characters used for carriage control
       in the printer stream. It does _not_ necessarily imply ASCII
       character codes.

                                                                [Page 1]
       [ 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   ]

 This document describes NETRJT, a modification of CCN's NETRJS
protocol specifically to provide remote job entry service to TIP's
using one of the methods (a), (b), or (c). NETRJT follows the general
model of NETRJS: use TELNET protocol over a primary or "operator"
connection pair, and open simplex secondary connections for data
transfer of job stream input and output. (We also considered the
possibility of using the Divert Output mechanism of the TIP for
sending remote job output over the operator connection, and an
analogous mechanism for input.  However, in discussion with Alex
McKenzie, it was agreed that sharing the operator connections has
little merit and causes lots of problems).

  NETRJT differs in two principal ways from NETRJS:

   1.  The NETRJT server process initiates the data transfer
       connections, under control of commands from the remote
       operator console. On the other hand, under NETRJS the
       remote user process has responsibility for initiating
       the opening of secondary data transfer connections; the
       NETRJS server simply listens on these sockets.

   2.  NETRJT provides the TELNET-like format defined above for
       data transfer, as well as the TIP-tape DTP format. NETRJS,
       on the other hand, is restricted to counts to delimit logical
       records within DTP-like transactions, and ASA carriage control.

 There are some other minor differences. For example, (1) the NETRJT
server takes responsibility for folding output records when they
exceed a size specified by a user command; under NETRJS, this was the
user process' responsibility. (2) There are NETRJT operator commands
to set the record format, record size, and code for each data transfer
connection. NETRJS made the first two fixed properties of a particular
terminal id, and deter- mined the last by the choice of ICP socket.
These differences imply remote operator commands in NETRJT in addition
to those of NETRJS. The operator must be able to (1) cause NETRJT to
open a secondary connection to a TIP socket, and (2) specify the data
transfer protocol, maximum logical record length, and/or transmission
code. These NETRJT commands are discussed in the following section.

 CCN plans to proceed with implementation of a NETRJT server with the
goal of completing an initial version by March 15, 1972. This initial
version may support only DTP=BS or TT, and RECFM=TELNET or RECORDS;
other options will be added as the need arises. We welcome comments
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