Network Working Group                                        A. McKenzie
Request for Comments: 633                                        BBN-NET
NIC: 30240                                                March 18, 1974


                  IMP/TIP Preventive Maintenance Schedule
	
   This note presents the current IMP/TIP Preventive Maintenance
   schedule.  Preventive Maintenance is scheduled on a monthly basis and
   a given machine is normally scheduled at the same time each month;
   wherever possible the time is chosen to coincide with the PM time for
   the Host(s) at the site.

   It is sometimes necessary to reschedule PM's because of network
   connectivity considerations or for other reasons.  Whenever this is
   necessary we will follow the usual procedure for scheduling down time
   with our "primary contact" at the site.  Permanent changes to the
   schedule will he announced via the RFC mechanism.

   PM's normally do not require the IMP/TIP to be taken down.  However,
   machines must be taken down in some cases, so no one should rely on
   the machine remaining available through the PM period.

   PLEASE REMEMBER THAT TUESDAY MORNINGS FROM 7am TO 9am ARE RESERVED
   FOR NETWORK SOFTWARE MAINTENANCE.


   All times shown below are Eastern Time.

    First Monday (of each month)

        BBN IMP  [0830-1130]

        NCC TIP  [1130-1430]

        WRIGHT-PATTERSON  [1300-1700]

    First Tuesday

        BBN TIP  [0830-1130]

        UCSB  [1130-1430]

    First Wednesday

        CARNEGIE  [0830-1130]

        SRI [1130-1430]

    First Thursday

        SDAC  [0830-1130]

        UTAH  [1030-1330]

        NORSAR  [0830-1130]

        LONDON  [0830-1130]

    Second Monday

        MIT-MAC  [0830-1130]

        MIT-IPC  [1200-1500]

        DOCB  [1030-1330]

    Second Tuesday

        MITRE  [0830-1130]

        USC [1130-1430]

    Second Wednesday

        CCA  [0830-1130]

        STANFORD  [1130-1430]

        XEROX  [1500-1800]

        RADC [1430-1730]

    Second Thursday

        BELVOIR  [0830-1130]

        UCSD  [1130-1430]

        RML  [0930-1230]

    Second Friday

        TYMSHARE  [1300-1600]

    Third Monday

        HARVARD  [0830-1130]

        UCLA  [1000-1300]

        KIRTLAND  [1600-1900]

    Third Tuesday

        RAND  [1130-1430]

        SDC  [1530-1830]

    Third Wednesday

        ILLINOIS [0930-1230]

        ARPA  [1800-2100]

        AMES IMP  [1130-1430]

        AMES TIP  [0800-1130]

        HAWAII  [1130-1430]

        MOFFETT  [1500-1600]

    Third Thursday

        ETAC  [0830-1130]

        FNWC  [1130-1430]

    Fourth Monday

        CASE  [0830-1130]

    Fourth Tuesday

        NBS  [0830-1130]

        LBL  [1130-1430]

    Fourth Wednesday

        LINCOLN  [0830-1130]

        RUTGERS  [1000-1400]

    Fourth Thursday

        GWC  [0930-1230]

        ISI  [1300-1600]

        ABERDEEN  [0830-1130]

    Fourth Friday

        LLL  [1330-1730]











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