RE: (PM) Line1 to Line1 (or maybe just a dumb question)

Dick St.Peters (stpeters@NetHeaven.com)
Sun, 28 Jun 1998 15:57:38 -0400

> > may be the exception to the rule, the Telco is not supplying the clock
>
> Rare. Which telco was this?

It's not rare, it is normal. Telcos do not provide clock on raw
(non-frame) lines.

If you are getting a digital service from the telco, such as frame or
dialtone, that service is clocked, and the telco sends you the clock
so you can synch to their service.

If they are providing only transport, you provide your own clock at
one end and use it at the other. If you're using the T to connect a
pair of channel banks, so the original signal is analog and has no
inherent timing, you don't need to synchronize the two directions and
can transmit independent clocking at each end. Older channel banks
used to do this as the norm.

--
Dick St.Peters, stpeters@NetHeaven.com 
Gatekeeper, NetHeaven, Saratoga Springs, NY, 1-800-910-6671 (voice)
Saratoga/Albany/Amsterdam/BlueMountain/BoltonLanding/Cobleskill/
Greenwich/GlensFalls/LakePlacid/NorthCreek/Plattsburgh/...
	  Oldest Internet service based in the 518 area code


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