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Network Working Group J. Melvin Request for Comments: 153 R. Watson NIC: 6758 SRI-ARC

                                                           15 May 1971
                         SRI ARC-NIC Status

Computer and Network Status

 The conversion to the DEC PDP 10, running the BBN operating system
 Tenex, has just about been completed.  We have had a number of
 obscure bugs which caused delays recently.  Several symptoms were
 traced to bad data being written into memory.  This problem was
 diagnosed as a noisey ground on a chip in the drum-disk memory bus
 access control.  With the problem fixed our reliability has improved
 significantly to about one crash every day or two.  System attention
 has now been turned to system measurement and tuning and to bringing
 up an NCP and Telnet.
 We have been working to bring up the BBN NCP of Doc. #1 NIC (5143,)
 and BBN's Telnet.  Because of our different configuration from BBN's
 and slightly different system we have not yet removed all the bugs
 caused by these differences.  As of May 14 we estimate that we are
 only a few hours away from completing this task.  We need more
 testing before we can provide network service.  We will bring up the
 NCP of RFC 107 NIC (5806) when we can obtain it from BBN and the
 official Telnet when it is specified and BBN can provide it to us.
 At present our local connect capacity allows for 12 displays and 24
 typewriter terminals.  With about 10 displays and 6 typewriter
 terminals running NLS, response is satisfactory, but marginal for
 display users.  The delivery in June of new Bryant drums and the
 measurement and tuning in progress should increase capacity and
 response.  How much improvement to expect is not known.
 The system processing required to support a network user is heavier
 than that required to support a local typewriter user.  Therefore we
 are not sure how many network users we will be able to support
 without degrading response seriously or requiring us to limit local
 loading by administrative restrictions.  Our guess at the moment is
 that we can handle 6 network users by middle summer with an
 optimistic expectation that we might be able to handle closer to 12.
 As there is only limited interactive experience over the network, we
 do not know what its response characteristics will be like.  We may
 find that the delays caused by two timesharing systems and the
 network transmission may allow us to support the higher number of

Melvin. et. al. [Page 1] RFC 153 Computer and Network Status 15 May 1971

 network users without adding serious incremental response delays.
 The loading caused by parallel processes controlling intersite file
 transfers is also an unknown factor at this point.
 We are pushing to increase our capacity by providing deferred
 execution facilities which will allow NLS compatible file preparation
 and editing offline or in local hosts and then will allow entry of
 the files so created into NLS for further manipulation.
 File capacity is also going to be a scarce resource and we are
 studying ways of using tape or the facilities at UCSB to give us an
 integrated auxiliary facilities.
 Our plans for providing online service to the network are briefly
 given below.  There are intermediate stages possible.  For example,
 if all goes well in the early part of Stage 0 we can probably allow
 more sites to participate in Stage 0.
    Stage 0 (June 18):
       Stage 0 is to provide experimental access to the NIC for a
       limited number of West Coast sites (these sites provide a
       variety of hosts and having them on the west coast simplifies
       communications for this initial trial period) so that we can
       learn how to handle any problems which may come up in actual
       network operation.
       Stage 0 will allow access to the Tenex Executive.  NICTNLS (NIC
       Version of Typewriter On Line System), an initial Network
       Dialog Support System-NICDSS (which will allow online creation
       and submission of messages and documents, with hardcopy mail
       delivery), and the first release of our users manual.
       We will allow an initial maximum of two network users on at
       There will be a two day NICTNLS course at SRI June 16-17 for
       the initial sites.
    Stage 1 (August 2):
       Stage 1 is to provide access to the NIC from any site in the
       network having the appropriate access software.

Melvin. et. al. [Page 2] RFC 153 Computer and Network Status 15 May 1971

       Stage 1 will allow access to a self contained version of
       NICTNLS not requiring access to the Tenex Executive, the NICDSS
       of Stage 0 with online access to documents and messages created
       online, online access of network related files such as the  NIC
       Catalog, ARPA Network Resource Notebook and NIC documentation.
       We expect to provide training to sites desiring access.  We
       will allow as many network users simultaneous access as we can,
       depending on initial success with system tuning.  A reasonable
       guess is 4-8.
    Stage 2 (September 6):
       Stage 2 will provide message delivery to files at remote sites
       (assuming the NWG establishes file transfer protocols soon and
       sites implement them), an initial deferred execution mode
       allowing users to prepare files on their systems and then have
       them entered into NICTNLS for further work, and improved query
       facilities of network online files.
       We hope to have improved Tenex-NLS performance so as to allow
       more network users simultaneous access than allowed in Stage 1.

Offline System Status

 Mailing:  We mail RFC's and other material going to Liaison people as
 soon as we can get the material duplicated, which is usually within
 24-48 hours after we receive it.  We mail material to station agents
 once each week, usually on Fridays.
 When people do their own direct mailing to the Liaison list, please
 send us a good copy, preferably the original, for duplication and
 sending to the stations.
 Document Numbering:  It is important for citation and cataloging
 purposes that each document created have a unique number.  Even if a
 document is just an update of one previously issued, one should use a
 new NIC number and RFC number and indicate which document(s) it
 supercedes.  There are lots of numbers so feel free to use them.
 Site Documentation:  Our recommendations on how we would like to
 handle this type of document and the type of information these
 documents should contain are described in RFC's 115 NIC (5822) and
 118 NIC (5830).  We urge each Liaison person and station agent to
 read these carefully.

Melvin. et. al. [Page 3] RFC 153 Computer and Network Status 15 May 1971

 Catalog:  Our biggest problem caused by the computer transfer has
 been getting out an up-to-date catalog.  We apologize for the
 inconvenience this has caused.  Producing the catalog has turned out
 to be a good debugging tool, however.  The most recent catalog,
 containing citations through 23 March, was mailed 13 May.  This
 catalog contains an RFC index through 5 May.  Currently a catalog is
 being produced to bring us up-to date.  With the issuing of this
 catalog around the end of the month, we expect to produce an up-to-
 date catalog on a monthly basis.
 General:  If there are any problems a station may be having in
 organizing or handling their collection which we could help with,
 please let our Information and Agent Coordinator Jeanne North know.
 If anyone has any suggestions for how we could improve our service or
 has any suggestions for services we should perform please let us
     [ This RFC was put into machine readable form for entry ]
        [ into the online RFC archives by Ryan Kato 6/01 ]

Melvin. et. al. [Page 4]

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