How to convert a RJ11 (4 pins) to RJ45 (Cat5) cable.....

petrading · Post by **petrading** » Fri Jun 06, 2008 11:43 pm

I bought this Linksys BEFSR41 Etherfast Cable/DSL Router few years back. In the package, it include a cable with 1 side the plug (the transparent plastic stuff) of RJ11 (4 pins, 4 wires) and the other end is the plug of RJ45 (8 pins, 8 wires) or ANSI/TIA/EIA-568-A. Thats wat I found on a normal Ethernet cable.

After i moved to a new place, everything included in the package now still with me, just not the mentioned cable.

Here I wish to know how to make the wiring, what I mean is which wire to which pin for both ends. I got the network cable, plugs and crimping tools with me. just dont know where to start~! Diagrams or clear pictures are most welcome~!!!

Post by **Shotokan101** » Sat Jun 07, 2008 12:05 am

This doesn't sound correct to me - what modem are you connecting the cable router to now ?

Post by **Neo** » Sat Jun 07, 2008 1:33 am

According to the user guide from HERE it says

Connect your cable or DSL modem’s Ethernet cable to the Router’s Internet port.

which sounds like the normal arrangement. Usually you would connect the Linksys BEFSR41 to a cable / ADSL modem using a standard Ethernet cable. Obviously, the modem would need an Ethernet port...doesn't it have one?

Techsolver · Post by **Techsolver** » Sat Jun 07, 2008 5:58 am

Did you used to be on a cable service (eg Virgin) and now you are on an ADSL service such as BT.

If so you need a new router.

petrading · Post by **petrading** » Sat Jun 07, 2008 10:30 pm

The cable is something like as show in the page below:

http://www.vnsatech.co.in/Accessories.html

Look at the R11/RJ45 to RJ45/RJ11~! But it just a really short cable,bout 30cm long.

I currently stay in Malaysia by the way............

Such wire/cable do exist in the market. Here I included some of the images I managed 2 find~!

Post by **mstombs** » Sun Jun 08, 2008 10:44 am

I used to have a Linksys BEFSR41v2, it had 5 standard RJ45 Ethernet ports. Standard Ethernet only uses 2 of the 4 pairs in RJ45+UTP, but the smaller RJ11 are usually used for ADSL. The Linksys AG241 is an ADSL router with 4 Ethernet ports which has a case which looks the same as a BEFSR41!

Techsolver · Post by **Techsolver** » Sun Jun 08, 2008 11:07 am

If and it is a big if, the router needed to connect to an RJ11 then the cable could just have an RJ11 on both ends.

RJ45 is designed to accept an RJ11 plug. Ethernet wiring is designed such that the centre pair (blue blue/white) are available for a phone connection. It is conceivable that a router could offer both ADSL and Ethernet WAN port by interchanging cables but one cable being a standard RJ45 patch, the other being a two core RJ11 - RJ11

This would assume that the router had both systems built-in which is unlikely.

Techsolver · Post by **Techsolver** » Sun Jun 08, 2008 11:15 am

By the way it is not possible to convert a broadband router that doesn't have an internal modem into an ADSL router using just a cable no matter what links you find with pictures.

It sounds like you are trying to connect to a standard ADSL type broadband connection which this router won't be capable of doing without some more hardware (and not just a cable). To buy the required hardware would cost as much (if not more) than buying a proper ADSL modem router.