>Isn't 50 feet the limit? A recent T1 customer had almost 100ft =
of CAT5,
which didn't work, but I finally asked... duh!
No, 16.5 dB is the limit, whatever that works out to be. Shielded =
cable is preferred.
It is actually against tariff to raise levels. Standard T-1 design =
states that you cannot deliver signal to the demarcation point =
greater than 16.5 dB. With the advent of HDSL, most T-1's are =
regenerated at the network interface (the demarcation point). Only =
"standard" T-1 designs (meaning they use standard T-1 signaling =
all the way from the office repeater to the demarcation point) do =
you have to have a repeater less than 3000 feet from the =
demarcation point. When a T-1 leaves the office, it goes through =
an office repeater bay where the signal is regenerated before it =
hits the local loop. Once it is on the exchange cable, there is a =
repeater at 3000 ft and additional repeaters every 6000 ft after =
that until you get to the demarc, where you need a last repeater =
within 3000 ft of the demarc. This ensures a good level to the =
demarc and also makes it possible to do hard wire loopbacks.=20
>Also, could the receive level be contributing to the Lost-Carrier =
problem=20
>people are experiencing (including us: 34.8% when using 3.5.1b11,=20=
>but only 5.1% when using 3.5.1b8)?
Sounds like a stretch to me.
Kyle Platts
CSS-Tech
!NTERPRISE Networking Services