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Network Working Group                                   Alex A. McKenzieRequest for Comments: 638                                        BBN-NETNIC: 30538                                                April 25, 1974IMP/TIP Preventive Maintenance Schedule      This RFC corrects numerous inaccuracies in RFC #633.  Rather than      trying to list all the changes, I urge all Liaisons and other      interested parties to look carefully at the times now listed for      the sites they are interested in.   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)         5 BBN IMP  [0830-1130]        40 NCC TIP  [1130-1430]        47 WRIGHT-PATTERSON  [1300-1700]    First Tuesday        30 BBN TIP  [0830-1130]         3 UCSB  [1130-1430]McKenzie                                                        [Page 1]

RFC 638         IMP/TIP Preventive Maintenance Schedule       April 1974    First Wednesday        14 CARNEGIE  [0830-1130]         2 SRI [1200-1500]    First Thursday        26 SDAC  [0830-1130]         4 UTAH  [1030-1330]        41 NORSAR  [0830-1130]        42 LONDON  [0830-1130]    Second Monday         6 MIT-MAC  [0830-1130]        44 MIT-IPC  [1200-1500]        25 DOCB  [1030-1330]    Second Tuesday        17 MITRE  [0830-1130]        23 USC [1130-1430]    Second Wednesday        31 CCA  [0830-1130]        11 STANFORD  [1200-1500]        32 XEROX  [1400-1700]        18 RADC [0900-1200]    Second Thursday        27 BELVOIR  [0830-1130]        35 UCSD  [1130-1430]        37 RML  [0930-1230]McKenzie                                                        [Page 2]

RFC 638         IMP/TIP Preventive Maintenance Schedule       April 1974    Second Friday        43 TYMSHARE  [1200-1500]    Third Monday         9 HARVARD  [0830-1130]         1 UCLA  [1000-1300]        48 KIRTLAND  [1600-1900]    Third Tuesday         7 RAND  [1130-1430]         8 SDC  [1530-1830]    Third Wednesday        12 ILLINOIS [0930-1230]        28 ARPA  [1700-2000]        15 AMES IMP  [1200-1500]        16 AMES TIP  [1300-1600]        36 HAWAII  [1430-1730]        45 MOFFETT  [1400-1700]    Third Thursday        20 ETAC  [0830-1130]        33 FNWC  [1300-1600]    Third Friday        21 LLL  [1230-1530]    Fourth Monday        13 CASE  [0830-1130]McKenzie                                                        [Page 3]

RFC 638         IMP/TIP Preventive Maintenance Schedule       April 1974    Fourth Tuesday        19 NBS  [0830-1130]    Fourth Wednesday        10 LINCOLN  [0830-1130]        46 RUTGERS  [1000-1400]    Fourth Thursday        24 GWC  [1500-1800]        22 ISI  [1300-1600]        29 ABERDEEN  [1300-1600]       [ This RFC was put into machine readable form for entry ]       [ into the online RFC archives by Alex McKenzie with    ]       [ support from GTE, formerly BBN Corp.           2/2000 ]McKenzie                                                        [Page 4]