1608   Daylight saving time indication

Created: 30 Dec 2017

Status: Ballot Period

Part: Part 9-3 (Precision Time Protocol Profile)

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Clause: none yet

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Category: Issue for edition 2 of this part

Issue

To support legacy installations that operate with IRIG-B, it may be necessary to convert time synchronization from PTP to IRIG-B. To this effect, IRIG-B needs an indication that daylight saving time is in effect. This information is carried by the PTP ALTERNATE_TIME_OFFSET_INDICATOR (IEEE 1588 §16.3)

Proposal

Grandmasters that support the ALTERNATE_TIME_OFFSET_INDICATOR (IEEE 1588 §16,3) should indicate the supported time zone in the displayName according to the abbreviation in https://www.timeanddate.com/time/zones/.
In addition, they should indicate that daylight saving time is in effect by appending a "*" character (ASCII 42) to the name, even if this is the only character in displayName.
NOTE 1: the time zone name changes only after the new time zone is in effect, IRIG-B specifies that the time jump be announced up to 60s in advance, while IEEE 1588 §16.3.1 indicates the minimum time in advance.
NOTE 2: the implementation of the management messages §16.3.4 to §16.3.7 is not requested.

Discussion Created Status
IEC/IEEE 61850-9-3 is not only for IEC TC57. It is the base of IEEE C37.238 and as such it must consider requirements from the IEEE side to widen the base. A proposal has been inserted which explains how to handle ATOI as an example. 20 Apr 18 Ballot Period
There is no requirement in WG 10 (i.e. IEC/IEEE 61850-9-3) on adding dedicated recommendations to support IRIG-B. (This rather belongs to C37.238). On the contrary, IEC 61850 compliant IEDs do not need any local time / daylight saving being received repeatedly. There are Logical Nodes defined to perform this functionality already today.
15 Feb 18 Discussion (red)
There is no requirement in WG 10 (i.e. IEC/IEEE 61850-9-3) on adding dedicated recommendations to support IRIG-B. (This rather belongs to C37.238). On the contrary, IEC 61850 compliant IEDs do not need any local time / daylight saving being received repeatedly. There are Logical Nodes defined to perform this functionality already today.
15 Feb 18 Discussion (red)
Changed to "+" for daylight saving time in effect and "-" for the contrary, no indication = don't know, interpret DisplayName.
IRIG-B has only one flag, but does not express if the flag is valid or not and what the default is (probably no DST). 		31 Jan 18 Ballot Period
This proposal helps migrate installations to IEC 61850. 30 Dec 17 Discussion (red)

 

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