See http://www.cesnet.cz/doc/techzpravy/2006/tsync/
There are serial RS-232 to UTP converters that enable you to bypass
the lenght limit put by the RS 232 standard.
I saw some in the US too by googling.
Give a shout if this link helps.

2007/10/18, Scott Baker <[EMAIL PROTECTED]>:
>
> My NTP server is run at the local phone company. They already have a
> GPS fed stratus 2 (?) time source fed via GPS on the roof. The CO
> guy told me that they have lots of leads off their "composite clock"
> and we could have one if we needed. Apparently this timing source
> feds all their telco gear (OC-X equipment, class 5 switch, etc).
>
> I asked him what I should look up and he said "composite clock." Is
> there some way to hook up a "composite clock" to the serial port on
> my server? It appears that a composite clock is three wires: tip,
> ring and ground? Any help on if it's possible to use this would be
> great.
>
> --
> Scott Baker - Canby Telcom
> RHCE - System Administrator - 503.266.8253
> _______________________________________________
> timekeepers mailing list
> [email protected]
> https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
>



-- 
Димитър Василев
Dimitar Vassilev

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