1 RJ45 to 4 BT converter?
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Posted by Sam Tolton on August 31, 2005, 3:18 pm
Please log in for more thread options 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? ------------------------------------- ##-----------------------------------------------## Article posted with Cabling-Design.com Newsgroup Archive http://www.cabling-design.com/forums no-spam read and post WWW interface to your favorite newsgroup - comp.dcom.cabling - 2379 messages and counting! ##-----------------------------------------------## | |||||||||||||||||||||||||
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Posted by James Knott on August 31, 2005, 12:26 pm
Please log in for more thread options Sam Tolton wrote: 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. | |||||||||||||||||||||||||
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Posted by Dmitri(Cabling-Design.com on August 31, 2005, 6:00 pm
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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 ------------------------------------- ##-----------------------------------------------## Article posted with Cabling-Design.com Newsgroup Archive http://www.cabling-design.com/forums no-spam read and post WWW interface to your favorite newsgroup - comp.dcom.cabling - 2381 messages and counting! ##-----------------------------------------------## | |||||||||||||||||||||||||
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Posted by Phil Partridge on August 31, 2005, 6:37 pm
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>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. >
>------------------------------------- > > > ##-----------------------------------------------## Article posted with >Cabling-Design.com Newsgroup Archive
http://www.cabling-design.com/forums
no- >spam read and post WWW interface to your favorite newsgroup -
comp.dcom.cabling
>- 2379 messages and counting!
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>##
Phil Partridge philp@pebbleGRIT.demon.co.uk Remove the grit to reply | |||||||||||||||||||||||||
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Posted by Carl Navarro on September 1, 2005, 3:58 pm
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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 | |||||||||||||||||||||||||
> why I shouldn't build my own?
>