Where does the time come from that analog handsets use to set their
> clock? My company's time is off by 2 min and I can verify that its
> getting the time from somewhere but where?
> I can prove it is getting the time from somewhere by setting it 1 hour
> off and calling it with my cell phone, and watching it get set again,
> problem is, its off by 2 min.
> - Thanks
> [TELECOM Digest Editor's Note: The time comes from a clock in the
> central office serving the phone. That two minutes difference most
> likely is an accumulation of a few seconds here and there over the
> several months since daylight time went into effect. Our time of day
> here comes from the Southwestern Bell central office in Independence
> which tends to 'drift' a little bit regularly. When Standard Time
> returns in the next week or so, the clock setting will get set to
> almost perfect. I say 'almost' because your caller ID device is not
> intended as any sort of time standard. PAT]
You're right it does come from the switches master clock, but if it is off, then they are not running their updates each night to the NBS or like clock.
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