Movatterモバイル変換

Network Working Note                                    Steve Crocker, UCLARFC-6                                                   10 April 1969CONVERSATION WITH BOB KAHNI talked with Bob Kahn at BB&N yesterday.  We talked about code conversionin the IMP's, IMP-HOST communication, and HOST software.BB&N is prepared to convert 6, 7, 8, or 9 bit character codes into 8-bitASCII for transmission and convert again upon assembly at the destinationIMP.  BB&N plans a one for one conversion scheme with tables unique to theHOST.  I suggested that places with 6-bit codes may also want case shifting.Bob said this may result in overflow if too many case shifts are necessary.I suggested that this is rare and we could probably live with an overflowindication instead of a guarantee.With respect to HOST-IMP communication, we now have a five bit link fieldand a bit to indicate conversion.  Also possible is a 2-bit conversionindicator, one for converting before sending and one for converting after.This would allow another handle for checking or controlling the system.The HOST can send messages or portions of a message to its IMP specifying        1.  Tracing        2.  Conversion        3.  Whether message is for destination IMP or HOST        4.  Send RFNM        5.  HOST up or down        6.  Synchronization        7.  Format Error Messages        8.  Master Link Clear        9.  Status RequestedThe IMP can send to its HOST information on        1.  Conversion        2.  REFNM Arrived        3.  IMP up or down        4.  Synchornization        5.  Called HOST not Responding        6.  Format Error        7.  Status in IMPI also summarized for Bob the contents of Network Notes l, 2, and 3.