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RFC 213 UNKNOWN INFRASTRUCTURE · OPERATIONS

IMP System change notification

A notice of capacity and statistics changes in IMP system version 2505.

On rfc-editor.org ↗
PUBLISHED
August 1971
AUTHORS
B. Cosell
STREAM
Legacy
HOST CAPACITY
Increased from 3 to 4
ROUND-TRIP TIME UNIT
800 microseconds
DOI
10.17487/RFC0213

RFC text

Original text · RFC Editor View on rfc-editor.org ↗ 
Network Working Group                              B. Cosell
Request for Comments:  #213                        BBN
NIC #7194                                          20 August 1971
Categories:  B.1
Updates:  None
Obsoletes:  None



                     IMP System Change Notification
                     ------------------------------


     During the week of 16 August, we installed a new version of
the IMP system, version 2505.  The new version incorporated three
principal changes:

     1)  The number of hosts the system can handle was increased
         from three to four. Although this caused a rather large
         internal change to the IMP, the only external effects of
         the change are the presence of a new status light [light
         8 monitors Host 4], and the lengthening of the 10-second
         and snapshot statistics.

     2)  The host handling routines were modified to gather more
         accurate and voluminous statistics on host usage of the
         network, and report them to NCC.

     3)  The 10-sec. statistics were changed to measure time for
         the host "round trip" statistic in units of 800 rather
         than 100 microseconds.

          It is not anticipated that the new system should have any
     direct effect on the hosts.





          [ 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   ]

ISO Plain Language

On this page
PROBLEMThe IMP system needed to support another host and provide more complete host-usage statistics to the Network Control Center.
MECHANISMVersion 2505 raises the supported host count from three to four, changes statistics collection and adjusts the time unit for a round-trip statistic.
SYSTEM UPDATEBBN expected no direct effect on hosts; external changes included an additional status light and longer statistics reports.

§1More Host Capacity

BBN installed IMP system version 2505 during the week of August 16. The system's host-handling capacity increased from three hosts to four.

The visible effects were a new status light, light 8, for Host 4, and longer 10-second and snapshot statistics.

The IMP can now handle four hosts instead of three. A new light shows Host 4, and some reports became longer.

§2Host Usage Statistics

The host-handling routines were changed to collect more accurate and more extensive statistics about host use of the network and report them to the Network Control Center.

The host round-trip measurement in the 10-second statistics changed from units of 100 microseconds to units of 800 microseconds.

The IMP reports more information about host use to the Network Control Center. The round-trip statistic is now measured in units of 800 microseconds.

§3Expected Host Impact

The notice says BBN did not anticipate any direct effect on hosts from the new system version.

BBN expected host systems to continue working without a direct change.