RFC 90 (rfc90) - Page 1 of 6

CCN as a Network Service Center

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Network Working Group                                        25 January 1971
Request for Comments: 90                                     R. T. Braden
NIC 5707


                    CCN AS A NETWORK SERVICE CENTER

A. INTRODUCTION

   CCN, the Campus Computing network of UCLA, will shortly be connected
   to the ARPA Network as a host of the "Service Center" type. The
   purpose of this RFC is to describe the hardware and software available
   at CCN and the services we are now planning to provide to other
   Network Hosts.

   These services and their implementation priority were chosen in
   consultation with a particular site (RAND) which plans to use CCN via
   the Network. We would welcome requests and comments from other sites.

B. CCN HARDWARE

   CCN operates an IBM 360/91KK, i.e., a Model 91 CPU with a 4 million
   byte fast memory.

      CPU Speed:      Highly program-dependent; 2-6 Mips, with 3 Mips as a
                      useful average.  The upper end of this range occurs
                      heavy floating point in the inner loops.  The decimal
                      arithmetic operation of a 360 should be avoided as
                      they are executed interpretively by the 91.

      Memory Speed:   Memory is interleaved 16 ways and extensively
                      buffered. Effective memory fetch time is 600 ns in
                      lower 2 million bytes, 900 ns in upper 2 million
                      bytes.

      I/O Con-
      figuration      a) 6 2860       Selector Channels
                      b) 1 2870       Multiplexor Channcl (with 16 control
                                      unit RPQ)
                      c) 5 2314       Disk Storage Units (i.e., 40 disk
                                      drives).
                      d) 1 2301       Drum (Systems residence and catalog
                                      only.)
                      e) 5 (245x)     9 track tape drives (80O bpi)
                      f) 3 (240x)     7 tracts tape drives (200/556/800 bpi)
                      g) 1  2291      (Modified 2250 CRT) Operator/
                                      Maintenance Console.




Braden
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