DComTalk.com

Hiya,

I am a technical manager at a company that offers serviced office space.
We have our own PABX and network systems and the building is flood-wired
with CAT5 terminated with female RJ45 wall sockets (pretty common). I
just registered to ask this question.

Since CAT5 cabling has 4 pairs and since a standard phone connection only
uses 2 pairs, is there a converter available that would allow me to plug 4
telephone cables into 1 RJ45 socket? I would obviously plug another into
the socket in the cabinet. We have run out of ports in 1 suite and this
would allow me to run 4 telephone lines down 1 CAT5 cable, saving me the
job of running more cables to the 5th floor.

If such a converter is not available on the market, is there any reason
why I shouldn't build my own?

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Sam Tolton wrote:

If such a converter is not available on the market, is there any reason
why I shouldn't build my own?

While I haven't heard of such a device, there's no reason why you couldn't
build one. You can buy boxes that can hold 4 keystone jacks or similar.
You'd populate them with appropriate phone jacks and run some 4 pair wire
to an RJ45 plug, which can connect to the jack.

In article <5TjRe.31683$c95.5785@fe11.news.easynews.com>, Sam Tolton
<sam_at_tolton_dot_co_dot_uk@foo.com> writes

Hiya,

I am a technical manager at a company that offers serviced office space.
We have our own PABX and network systems and the building is flood-wired
with CAT5 terminated with female RJ45 wall sockets (pretty common). I
just registered to ask this question.

Since CAT5 cabling has 4 pairs and since a standard phone connection only
uses 2 pairs, is there a converter available that would allow me to plug 4
telephone cables into 1 RJ45 socket? I would obviously plug another into
the socket in the cabinet. We have run out of ports in 1 suite and this
would allow me to run 4 telephone lines down 1 CAT5 cable, saving me the
job of running more cables to the 5th floor.

Google on Coolport.. Depends on the type of telephone system you have as
to which pair(s) are used, so which you can use.

If such a converter is not available on the market, is there any reason
why I shouldn't build my own?

No reason whatsoever, have done this in the past.

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Phil Partridge
philp@pebbleGRIT.demon.co.uk
Remove the grit to reply

Sam Tolton wrote:

Since CAT5 cabling has 4 pairs and since a standard phone connection
only
uses 2 pairs, is there a converter available that would allow me to
plug 4
telephone cables into 1 RJ45 socket? I would obviously plug another
into
the socket in the cabinet. We have run out of ports in 1 suite and
this
would allow me to run 4 telephone lines down 1 CAT5 cable, saving me
the
job of running more cables to the 5th floor.

If such a converter is not available on the market, is there any reason
why I shouldn't build my own?

Although there is nothing that stops you from making your own out of an
8P8C plug, a short piece of cable, 4-port surface mount box and 4 8P8C
jacks, there are products on the market that do just what you need. One
example is Black Box'es FM825 adapter. I'm pretty sure plenty other people
have the same type adapter, too. I just had Black Box catalog sitting on
top of the pile ;-)

Anyways, be careful with your 1-pair per phone assumption. You've
mentioned a PBX, and plenty times you need actually 2 pairs per extension.
In this case you'll have to worry about the pinout the adapter supports:
T568A or T568B or USOC. But if you are sure yours are 1-pair phones, it's
an easy job and the above mentioned adapter will do it just fine.

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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On Wed, 31 Aug 2005 15:18:25 GMT, sam_at_tolton_dot_co_dot_uk@foo.com
(Sam Tolton) wrote:

Hiya,

I am a technical manager at a company that offers serviced office space.
We have our own PABX and network systems and the building is flood-wired
with CAT5 terminated with female RJ45 wall sockets (pretty common). I
just registered to ask this question.

Since CAT5 cabling has 4 pairs and since a standard phone connection only
uses 2 pairs, is there a converter available that would allow me to plug 4
telephone cables into 1 RJ45 socket? I would obviously plug another into
the socket in the cabinet. We have run out of ports in 1 suite and this
would allow me to run 4 telephone lines down 1 CAT5 cable, saving me the
job of running more cables to the 5th floor.

If such a converter is not available on the market, is there any reason
why I shouldn't build my own?

Back in the day, and on our side of the pond, we used a MERLIN
splitter cable, which took 4 RJ-11's to a 568B 8-pin plug.

Hubbell still shows it in the catalog, but IIRC it's pretty pricey,
like about $12-15 for a 12-foot cable. p/n BMD04p26712DE

Carl Navarro