Time change early... 4

[ericbrunson]

I came in this morning and the time on my opt81c was set back an hour.

Is the switch smart enough to think it knows when DST ran out and updated itself early, or should I suspect my vendor set it remotely for some reason?

 

[techman3030]

Use LD 2 to check your DST settings.


The daylight savings time adjustment can be programmed to take place
automatically. You can set the date to change to daylight savings, and to
return to standard time. This information can be queried at any time.
The following commands are accepted by this program for this capability.
The system clock MUST ALREADY be set for the daylight savings time to
be updated. This information survives sysload.
• FWTM = Set the date and time for the clock to move forward.
• BWTM = Set the date and time for the clock to move backward.
• SDST = Enable or disable the automatic change.
• TDST = Query the change information.

To implement these commands, use the following.
• FWTM <month> <week> <day> <hour>
month = 1-(4)-12 [January-December]
week = (1)-5, L [1st-5th, L is the last week of the month]
day = (1)-7 [Sunday-Saturday]
hour = 1-(2)-22 [Midnight-11:00 pm]
• BWTM <month> <week> <day> <hour>
month = 1-(10)-12 [January-December]
week = (1)-5, L [1st-5th, L is the last week of the month]
day = (1)-7 [Sunday-Saturday]
hour = 1-(2)-22 [Midnight-11:00 pm]
• SDST ON, (OFF)
ON enables the automatic change capability
OFF disables the automatic change capability
• TDST <CR>
The output reflects the input format to indicate the change information.

 

[ericbrunson]

Thank you, that's very helpful. I'll set that up, but I guess SBC made a mistake and set it forward early.

 

[ericbrunson]

That was interesting...

The year was set wrong, so it thought the last sunday of the October was today...

 

[ericbrunson]

Hmmm... In the year 4 the last sunday of October fell on the 26th (mathematically, not really). I think someone set the date to 04 and not 2004.

 

[McGruff753]

Your programming should look like this:
.TDST
SDST ON
FWTM APR 1 SUN 2 (AT 02:00 4/4/2004 )
BWTM OCT L SUN 2 (AT 02:00 31/10/2004 )

Since it is still 2004, the April one has not changed yet. After January 1st, it will change automatically to:
.TDST
SDST ON
FWTM APR 1 SUN 2 (AT 02:00 3/4/2005 )
BWTM OCT L SUN 2 (AT 02:00 30/10/2005 )

 

[johnpoole]

i've gotten a couple of calls from users that were reset last sunday, one had the option set up wronge and the other was a vendor error...

john poole
bellsouth business
columbia,sc

 

[McGruff753]

Most likely they were set as BWTM OCT 4 SUN 2, right? Three out of seven years, October has 5 Sundays. The other four years there are 4 Sundays. That is why it is important to have the L instead of setting a specific Sunday.

 

[McGruff753]

And when you look at the defaults that Nortel provides, isn't it strange that FWTM is defaulted correctly, but BWTM is defaulted to the first Sunday of October instead of the last? Good ol' Nortel.

 

[Firebird Scrambler]

Just for reference, Here are the settings for the UK "GMT" which will apply this weekend on Sunday morning at 02:00am.

FWTM 3 5 1 02
BWTM 10 5 1 02
SDST ON

This should printout the following info..

.tdst
SDST ON
FWTM MAR L SUN 2 (AT 02:00 28/3/2004 )
BWTM OCT L SUN 2 (AT 02:00 31/10/2004 )

I hope this helps

All the best

Firebird Scrambler
Meridian Programmer in the UK

 

[McGruff753]

Firebird,

Does the UK change their times differently than the US? I see in your programming you 'Spring Forward' on the last Sunday of March. We 'Spring Forward' on the first Sunday of April.

 

[Firebird Scrambler]

Yes the dates are different & they also vary within Europe.

All the best

Firebird Scrambler
Meridian Programmer in the UK