RFC 638

RFC 638: IMP/TIP Preventive Maintenance Schedule 🎀

okay bestie, the title block first 💅 This is RFC 638, written by Alex A. McKenzie of BBN-NET (NIC 30538), dated April 25, 1974. The original doesn't list a category, and it doesn't have an obsoletes or updates field. What it does say is that it corrects numerous inaccuracies in RFC #633, so Alex asks all the Liaisons and other interested parties to check the times listed for their sites. no cap, that's a whole glow-up for RFC 633 🌸

The doc itself is a schedule for IMP/TIP preventive maintenance (that's PM for short ✨). It's fully scheduled every month, and each machine usually gets the same slot every month. Whenever it can, the time is picked to line up with the PM time for the Host(s) at that site. so the network and the hosts are on the same wavelength, iconic 🧚

Sometimes PMs need to be moved, because of network connectivity or other reasons. When that happens, Alex's team follows the usual down-time procedure with the site's "primary contact" 🫶 And if the schedule changes for good, it gets announced through the RFC mechanism.

PMs normally don't need the IMP/TIP to go offline. BUT machines do have to go down in some cases, so nobody should count on the machine being up the whole PM window 😭

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

Here's the schedule. Every time is 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]

    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]

    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]

    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]

The original also has a note saying it was put into machine readable form for the online RFC archives by Alex McKenzie, with support from GTE (formerly BBN Corp.), in February 2000 🌈

       [ 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 ]