Hi There are so many vendor / country specific sub (sub...sub) frames in T1/E1 that there must be at least one that sticks in time of day...
Bob Sent from my iPhone On Nov 23, 2011, at 7:01 PM, Mark Spencer <[email protected]> wrote: > I'm curious if any one has any specific information about how TOD data could > be sent via the native T1 data frames (as opposed to a signal which another > piece of equipment could use as a clock source.) > > I've never seen any specs for sending TOD information via the ESF Data Link > or any other means, but that doesn't mean a spec doesn't exist somewhere. > > --- On Mon, 11/21/11, Charles P. Steinmetz <[email protected]> > wrote: > >> From: Charles P. Steinmetz <[email protected]> >> Subject: Re: [time-nuts] Symmetricom TimeSource 2700 >> To: "Discussion of precise time and frequency measurement" >> <[email protected]> >> Received: Monday, November 21, 2011, 6:13 PM >> Kevin wrote: >> >>> The PPS in/out of the PRS10 do not appear to connected >> to the TS2700 >>> logic board. >> >> I believe the TS2700 does not take PPS timing from the >> PRS10, nor does it discipline the PRS10. It does, >> however, keep tabs on the frequency of the PRS10, and I >> believe it uses this information to generate corrections to >> the TS2700 frequency and timing outputs during holdover -- >> that is, I believe it does not just pass through the PRS10 >> 10 MHz signal and derive other timing signals from it during >> holdover, but applies corrections that it has learned from >> its monitoring. See the block diagram at p. 19 of the >> TS2700 manual and text at p. 14. >> >>> I'm not looking for a >>> PPS that's just a frequency/period reference, but >> instead places the PPS >>> at the GPS PPS position. Perhaps the TS2700 is already >> do it, but so far, >>> I've only seed evidence that it's a frequency >> reference. >> >> The whole point of the TS2700 is to be a Stratum 1 time >> source. See the TS2700 manual at pp. 14 and 113. >> The TS2700 clearly sends TOD information -- pretty much >> every BTMon window contains a TOD display. >> >> Because the TS2700 was designed for telecommunications >> central office applications, the main outputs are two T1s, >> "Span A" and "Span B," rather than computing protocols that >> would be more familiar to most techies. To access the >> TOD and timing information, I think you would need to decode >> the T1 data stream. It may be available at the "Craft" >> output, as well -- the TOD data definitely is, but I do not >> know about the precision timing data. (For those who >> are curious, "Craft" is an ancient telecommunications >> term.) >> >> Best regards, >> >> Charles >> >> >> >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
