Shielded RJ-45 cable for J1 app

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 Question by Chris Bobek posted 26 Feb 2001
 Shielded RJ-45 cable for J1 app
Hi,

I designed a product for a customer that supports
a J1 interface. J1 is almost identical to T1
(Japanese standard). We require a bunch of test
cables, but I'm not sure if what I need is
standard, or if I need a custom cable. Here's
my requirements:

1) Shielded RJ-45 on each end (the metal shield
surrounds the plug).
2) Two pairs are being used, (pin 1-2) and
(pin 4-5).
3) The pairs are straight-thru (not cross-over).
4) There is a cable shield.
5) Length ~= 25 feet.
6) Qty = 40 cables
I'm assuming STP CAT5 will work, but I'm pretty
much clueless when it comes to cables. What
do you specifically recommend?

Thanks for your help!

Chris Bobek
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 Answer by Dmitri Abaimov posted 01 Mar 2001
Dear Chris,

Thank you for specifying your application cabling needs so thoroughly.

Well, I don't see any reason why a shielded CAT5 patch cable won't work. I also don't see any reason why a shielded CAT3 cable won't work since even CAT3 has 16 MHz bandwidth. Your application will utilize just about 1/10th of it as I suggest.

25 feet CAT5 patch cord is not quite standard since there is a 10 meters (~30 feet) limit on the combined patch cords length for the full CAT5 horizontal run. However, 25 feet cable is OK for connecting central equipment and every vendor makes 25 feet cords anyway.

Sincerely,
Dmitri Abaimov, RCDD

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