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rj11 connection using cat 5 cable pinout

Anyone tell me what the pin out is using RJ11 connectors and Cat5 is this possible since my modem only takes a RJ11 I want to use cat 5.
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gnickolson
Asked:
gnickolson
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1 Solution
 
Sanjay SantokiCommented:
Hello,

If I am not getting wrong, you can use any pair out of four from cat 5.

Thanks,
Sanjay Santoki
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gnickolsonAuthor Commented:
What is the pin out for the pair I was going to use the blue pair
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raysonleeCommented:
sure you can use cat 5 cable for RJ11 jet/plug.
usually the central pair (pin 4 & 5) will be used.
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raysonleeCommented:
blue pair is 4 & 5.
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gnickolsonAuthor Commented:
I just tried blue and blue white in 4&5 didnt work
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raysonleeCommented:
It definitely should work.
Have u check the cable and connectors on both side?
How do you connect?
Modem (RJ11 socket) - RJ11 plug - RJ11 cable - RJ11 plug - RJ45 socket - Cat 5 cable - RJ45 socket - RJ11 plug - RJ11 cable - RJ11 plug - telco RJ11 wall socket?
or simply
Modem (RJ11 socket) - RJ11 plug - Cat 5 cable - RJ11 plug - telco RJ11 wall socket?
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gnickolsonAuthor Commented:
for some reason I had to use green/white  -   orange/white  -  orange   - green
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raysonleeCommented:
Model only use the central pair of RJ11, why do you need two pairs?
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raysonleeCommented:
I mean modem...
The blue pair didn't work perhaps you have bad connection somewhere.
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gnickolsonAuthor Commented:
No bad connection I dont know why I need 2 pair but the cable that came with modem had two pair so I just wired the cat 5 the same way. Mabye its because I have 40mg down and 5mg up ?
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gnickolsonAuthor Commented:
should I loose speed if I use a longer cable say 20 feet I went from 40 meg to 30 meg
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raysonleeCommented:
the spec for Cat 5 cable is up to 100Mb/s, 100 meter cable should not be a problem.
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Robert Sutton JrSenior Network ManagerCommented:
What type of service is being delivered? Is this simple DSL? ISDN? <== THis is important as this will change the pinout scheme that the device is looking for signal on. And, FWIW you can use any "Pair" you want as long as it matches what your provider is handing you. IE: If you privder finds a defective pair coming into the building on Bl/BlWh, then they may use green or orange or even brown. Let us know what type of service and we'll go from there.
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raysonleeCommented:
Usually DSL modem uses 1,2,3,6 and ISDN BRI uses 4,5,7,8 with RJ45. Analog modem for POTS phone line use 4,5. If you have Orange and Green pair working, probably you have DSL modem, right?
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SmukecCommented:
As this is a modem it is tied to telephony. Telephony generally uses one pair. (simplified)
- This is simple if you have an analog connection to your telco - one pair from telco to your modem. It is not advisable to have many devices linked in parallel.
- If you have ISDN, then you still have one pair to the telco, but have a termination box in your home which adds power for the phones. As you have a modem, it probably has its own power adapter or it is even internal. In both cases you don't need the power pair.

In both cases you need just the central pair. But it needs to be a twisted pair - always a combination of a full color and combined with white. This is not an etherent cable.

Troughput might be a limitiation due the distance of the telco switch from your home.
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SmukecCommented:
We were all into the discussion of a single/double pair.
On which side of the modem are you talking about:
a) telco side
b) your network side?
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Feroz AhmedSenior Network EngineerCommented:
Hi,

The speed depends on Bandwidth provided from ISP and not length of the wire ,RJ11 is used to connect telephone line to Modem and for dialing ISPand connecting to Internet.Modem cannot take cat5 cable,Cat 5 cable is used for connectivity between systems in LAN and Peers.

There is a sequence of cabling between peers in Cat5 cable ,if there are 2 similar devices then the cabling should be cross cabling and cabling sequence is green,&white of green,orange,blue&white of Blue,white of Orange,brown and white of brown,this colour sequence differ in between peers in similar as well as dissimilar devices.
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SmukecCommented:
sm_feroz,
 you're right in terms of local networks, but I was refering to distances on the "outside" part of the network (and not clearly reading the distances he mentioned). But still it is a question of much longer distances. There is anyway a max length for Cat5 cabling - about 100m.
Neither of those might have impacted gnickolson issues

gnickolson,
 might be worth reading http://en.wikipedia.org/wiki/Category_5_cable

If you want to use Cat5 cable on RJ11 connectors it is important to use paired wires: color - color/white
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