4 ms·
For what it's worth, there is still an official talking clock phone number one can call to get the time. I don't know how much latency POTS and cell phone servi
by lbourdages 3y ago
For what it's worth, there is still an official talking clock phone number one can call to get the time. I don't know how much latency POTS and cell phone service have, but it's something.
https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-official-time/telephone-talking-clock https://nrc.canada.ca/en/certifications-evaluations-standard...
- rerdavies 3y agoFine over landline; but inconsistent on cellphones. :-P Before the CBC went digital, they had dedicated landlines to the NRC time signal lab.
- lbourdages 3y agoI just tested it against https://time.is https://time.is on my cell phone (using wifi calling because network strength is abysmal where I live). I don't have a precise measurement but it was imperceptibly close, within 100ms probably. Certainly close enough to set a clock for non critical purposes.
- Nextgrid 3y agoThere is more and more VoIP within the PSTN so landlines aren't "safe" either if you need millisecond accuracy.