Hi Some (but by no means all) gear actually looks at some of the data fields on the T1 before it will accept it as a reference. In most cases a bits clock does fine. Of course you do need a proper balanced line driver and all that stuff to get it running.
Still not something that's readily available in my basement. At work - not a problem. The simple / stupid way to do it is to use a framer chip. They are cheap these days and they have all the driver stuff built in. They will even pack the data fields with "hey, I'm a good clock - use me". Run a cheap PLL to generate the framer clock and you are up and running. Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J.D. Schoedel Sent: Wednesday, February 08, 2012 1:52 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Why a 10MHz sinewave output? Hal Murray wrote: > li...@rtty.us said: > >> Thank goodness for that inertia. I can still cable up a 100Kcps sine wave >> standard to run stuff from "long ago". When I run into a box that uses a T1 >> signal for a clock reference - not so easy in the basement. >> > > How much gear is there that uses T1 for a clock input? > > Is there any interest in a board/chip/whatever that converts 10 MHz to T1? A > clean design using a decimal DDS should fit into a small FPGA, maybe a CPLD. > > There is quite a bit of telecom gear that will take a T1(or E1) as a clock reference. A T1 BITS will provide an all 1's AMI signal which looks like 772 kHz on a scope. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.