How to connect RJ11 to Cat5 pins 7 & 8? 1

[flightsds]

Hello,
I have read that in the same cat5 cable, pins 1 thru 6 can be used for data/lan and pins 7 & 8 can be used to run phone line. My question is RJ11 has 4 wires(Green/Yellow pair and Red/Blue pair), how do I connect these 4 RJ11 wires to 2 pins on cat5?
thanks,
-Satish

 

[franklin97355]

Most of the time, when you use a 8 conductor cable for two conductor phones you terminate the 8 conductor cable on an 8 position jack and plug the 6 position RJ plug into it. Using the blue/white pair for voice.

The answer is "42"

 

[flightsds]

sorry if I was not clear. The builder has run only one cat5 cable from central panel to wall. I want to run both data and voice(phone, I have VOIP) on that one cable. On wall outlet I want to have both RJ45 and RJ11 jacks. In the central panel I was successful in running connection data/lan by connecting pins 1 thru 6.
Now I need to connect the RJ11 out from my VOIP modem to the RJ11 outlet in the wall using just one remaining pair of cat5. Since RJ11 has 2 pairs and I have only 1 pair remaining, how do I make connections in phone punch block? I have read in this forum that many people have done this, but I don't know how.
thanks.

 

[TouchToneTommy]

First off, RJ-11 has ONE pair, and it's connected to the center pins of a 6 position jack, no matter if it has 2, 4, or 6 actual pins in it. But that's a discussion for another day.....

Your central panel - is it one of those recessed panels that fits between two studs? If so, I hope you have some spare room inside of it to work with.

How many pairs do your phones actually require? Are they single line phones that only need one pair, or two line phones that require two pairs?

Since your builder only ran one cable, you're going to need to bastardize the whole installation, if you aren't going to pull more cable.

Get more of the termination modules for the central panel. For each cable, terminate two pairs on pins 1,2, & 3,6 for the data side, and 4,5 & 3,6 for the voice side. At the face plate, terminate the data pairs on an 8 pin jack matching 1,2 & 3,6, and the voice on a 6 pin jack on 3,4 & 2,5 (nothing on 1,6)

Get one more termination module, loop your incoming telephone lines to each of the jacks, so you have something to patch from to your voice termination modules.

Good luck on this one!

 

[buitenhek]

Caution:
Running both high speed data (10mbps+) and low speed voice on a single cable will(may)cause problems. Many years ago we did this with mixed results.
History:
When phone systems were analog, the worry was that someone would plug a computer into the phone jack and when that phone line would ring with ~24vdc -boom goes the circuit board. Hence the pins 1,2,3,6 for data and pins 4,5 for voice 1. The jack size, RJ45 and RJ11 or RJ12, also helped strengthen the "keep it separate sam" notion.
Today, the digital phone system doesn't have that risk. However, mismatched data-voice speeds have caused problems.
Recommendation:
1. Contractor was dumb in only pulling 1 cable (cheapskate)
2. There are RJ45 splitters that you can buy that split the circuit into 2-data, 1-data 1-voice, 1-data 2-voice etc but you need one at each end.
2.Follow Tommy's posting, Data on 1,2,3,6 and Voice 1 on 4,5 and Voice 2 on 7,8. But it will not pass certification!

Regards
Peter Buitenhek
ProfitDeveloper.com

 

[GMgerry]

Hubbell make an adapter that simply plugs into the RJ 45 and separates the pairs needs. No need to untermanate any cabling. Check the web site to get the proper part number, but look closely they are very close. They are about 20 bucks a pair.

 

[aarenot]

i install phone systems now, but did start out my carreer running cable. if i am contracted to install the phone system in this situation, i tell them to run more cable.

i do mdf and not rdf cross connect, or i run patch cords included in the system install, anything more is time and materials. i will also get a work order signed for the additional work of reterminating the existing cable outside of industry standards, and outside of any warranty of the quality past the phone systems ext port. in essence, if you have a problem, plug the phone straight in at the system, if it works there, no warranty, or support beyond me coming out on time and materials. if i do come out, any work i do will not include any warranty of quality of service, unless new cable is run for the phones.
i like these situations as i make time and materials, and if it has issues, i make more time and materials, until they put in industry standard cabling. adding splitting devices adds two more failure point for me to make time and materials to come out and say, replace the splitter. the splitters do go bad, get bumped, broken, or misplugged for lots of great time and materials money for me.

i do tell the customer that the cabling job is sub-industry, and common sense standards if they have issues with the phones due to this. also, even if they do not pay me time and materials for fixing the wiring, i still charge time and materials, not warranty service, if i come out, and the phone works fine plugged straight into the system ext port, but has issue at the jack.

i have three recomendations, and all three are run more cable.

 

[LeeMcCauslin]

Am I missing something? If the phones are VoIP why are they needing any rj11 jack at all? Why don't they just plug into the network cable that's already there (Either directly or with a switch if the phone doesn't include a switch/hub) The VoIP phone on my desk goes nowhere near the phone jacks. It's all network.

 

[fs483]

Well Videotron (local ISP in my area) offers a "VOIP" service which isn't really in the true sense of VOIP from what I heard. Basically Videotron supplies a cable modem. Behind the cable modem, you connect your ethernet/usb to your pc/router. There's also an RJ11 jack behind the cable modem that you connect to the closest telepone wall jack. Since all the telephone wall jacks in the house are connected centrally to one point (the demarc), then all the phones become connected to the cable modem. The voice piggy backs on the coax cable so it's not really envelopped in an IP packet. True VOIP systems will convert the voice into IP packets and with QOS deliver the packets. The way Videotron does it, QOS is not necessary and additional cabling (cat3 or whatever) is not needed to deliver voice service. I do believe however the voice is converted into IP at the headend though. They offer very competitive pricing for their package and is stealing a lot of business from Bell.

 

[TouchToneTommy]

Don't confuse VOIP telephones with VOIP dial tone.

 

[LeeMcCauslin]

Ahh, ok. That makes more sense.