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To: John Mansfield who wrote (9168)1/21/1998 12:24:00 PM
From: John Mansfield  Read Replies (1) of 31646
 
IEE guide: 5.4.3 Identifying embedded systems with potential time-related problems '

iee.org.uk

<snip>

'5.4.3.2 Failures may occur in systems which:

(a) implement a timed control sequence operate on a timed basis (e.g. with 5 minute cycles)

(b) shut down unless a maintenance cycle is adhered to

(c) produce regular (hourly/daily/weekly etc.) reports

(d) report / handle timed events and alarms

(e) calculate totals over time

(f) calculate averages, rates or trends

(g) rely on external timed data

(it is reported that Rugby time signals have a problem)

(h) rely on external geographical (GPS) data

(i) use or produce time-stamped data

(j) maintain historical state-of-system data

5.4.3.3 A system may however suffer from the Year 2000 and other time-related problems even if it does not involve any of these functions or characteristics. This is because the internal operation of the system may depend on a clock (used in a general sense to include all timing devices).

5.4.3.4 The working of the clock may be dependent on a value for the year. There are those who argue that this is exceptional and unlikely; nevertheless instances have been found of systems which will fail in the Year 2000 or thereafter if no remedial action is taken even though they neither have nor apparently depend on any time function. '
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