From: Jay Hennigan (jay@west.net)
Date: Tue Nov 12 2002 - 13:33:44 GMT-3
On Tue, 12 Nov 2002 fergus.falconer@bt.com wrote:
> Joe
>
>
> Snip from http://www.cisco.com/warp/public/129/bri-layer1.html
>
> For a U interface, the cable should be straight through RJ-45 and should
> contain the middle two pins (pins 4 and 5). An S/T interface, on the other
> had, uses pins 3,4,5, and 6. To check whether the cable is straight through,
> hold the RJ-45 cable ends side by side, and you should see that pins are in
> the same order. Refer to RJ-45 Cables for further information on
> distinguishing between the types of cables. Use a cable tester to ensure
> that there is an end-to-end continuity on those pins. Also, the preferred
> cable length is less than 23 feet (7 meters) and should not exceed 32.8 feet
> (10 meters).
Well, for a U interface, it can be a little longer than 10 meters. Like
about a mile.
> Antone know if there is a minimum cable length for ISDN? Specifically from
> the U interface to the NT1.
I don't think there is a minimum. The typical U-interface PBX will usually
have a pigtail of a couple of meters.
-- Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net NetLojix Communications, Inc. - http://www.netlojix.com/ WestNet: Connecting you to the planet. 805 884-6323
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