Cross-connect issue?

Cross-connect issue?
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Subject Author Date
Cross-connect issue? davehall 03-03-2005
Posted by davehall on March 3, 2005, 2:12 am
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I've connected a Samsung DCS 816 to a patch panel via its amphenol

cable - I can plug phones directly into this patch panel with

mod-taps and they work.



However, when I try to patch each connection to the distribution panel

for wall/floor outlets, the phones no longer work - should I be

cross-connecting the patch panels?



Many thanks!




NMFall 20%
Posted by Carl Navarro on March 3, 2005, 5:09 am
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On Thu, 03 Mar 2005 02:12:12 -0600,
david@pchelpscotland.co-dot-uk.no-spam.invalid (davehall) wrote:

>I've connected a Samsung DCS 816 to a patch panel via its amphenol
>cable - I can plug phones directly into this patch panel with
>mod-taps and they work.
>
>However, when I try to patch each connection to the distribution panel
>for wall/floor outlets, the phones no longer work - should I be
>cross-connecting the patch panels?

What kind of patch cable are you using?

My guess is that the Samsung set is polarity sensitive. If you're
using RJ-14 patch cords, try making up data cables instead of
telephone patch cords.

Carl Navarro



Posted by Dmitri(Cabling-Design.com on March 3, 2005, 4:56 pm
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davehall wrote:




> I've connected a Samsung DCS 816 to a patch panel via its amphenol

> cable - I can plug phones directly into this patch panel with

> mod-taps and they work.



> However, when I try to patch each connection to the distribution panel

> for wall/floor outlets, the phones no longer work - should I be

> cross-connecting the patch panels?



> Many thanks!

I am not a Samsung guy, so take my advice with a grain of salt ;-)

I think that you may have a problem with different pin layouts on the
panel your amphenols are terminated at and the rest of your cabling
system. This would affect your phones if they are two-pair phones. This
would not the case if they are single-pair phones. Basically, what happens
is the second pair on a T568A panel would end up in place of third pair on
a T568B jack. Some phones use the second pair for delivering power, so, it
would essentially be dead if power for the phone ends up not where it's
expected.
Here is a link to these pin layouts:
http://www.cabling-design.com/references/pinouts/t568ab.shtml
Check them out, see if this problem applies to you.

To fix this problem you would have to re-terminate the amphenol panel or
use special cords converting A to B. I personally would prefer
re-terminating the amphenol panel because all you need to do is to move
pair 2 to 3 (or vice versa) on every port, and it's easy to do if you have
a punch-down tool.

Hope this helps. Good luck!

--
Dmitri Abaimov, RCDD
http://www.cabling-design.com
Cabling Forum, color codes, pinouts and other useful resources for
premises cabling users and pros
http://www.cabling-design.com/homecabling
Residential Cabling Guide
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