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398 posts

Ultimate Geek
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Topic # 138428 3-Jan-2014 16:50 Send private message

I want to use my Linksys PAP2T with my existing structure cabling, and am thus looking for some RJ11 to RJ45 cables, any suggestions on where to find these? (aka plug existing analogue cordless phone into RJ45 socket in the lounge and keep the PAP2T in the cupboard with the router and switch etc)

Will the RJ12 to RJ45 cables from Cables Direct be suitable?

http://www.cablesdirect.co.nz/catalog/entry?entry=384

Thanks

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2086 posts

Uber Geek
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  Reply # 960837 3-Jan-2014 16:53 One person supports this post Send private message

Yep RJ12 will be fine. Just has the extra two pins the RJ11 is missing.

498 posts

Ultimate Geek
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  Reply # 960877 3-Jan-2014 17:37 Send private message

Just to help with visualising the pinouts on the RJ Plugs (wired with ribbon cable for voice use)
here is a little pic

The Handset cord plug is also reffered to as RJ10

The discription after the name reffers to the number of Pins and then the number of Pins Connected


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  Reply # 960881 3-Jan-2014 17:39 Send private message

You can actually put an RJ-11 plug in an RJ 45 socket but i don't think it's recommended.





498 posts

Ultimate Geek
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  Reply # 960883 3-Jan-2014 17:42 Send private message

Zeon: You can actually put an RJ-11 plug in an RJ 45 socket but i don't think it's recommended.


Correct as the edges of the plug push up the sprung pins in the socket, and bend them up, so when you try to then use the socket for a data outlet later you have miss connections

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  Reply # 960884 3-Jan-2014 17:43 Send private message

Zeon: You can actually put an RJ-11 plug in an RJ 45 socket but i don't think it's recommended.


It will work quite happily. The problem can occur when you need to use an RJ45 back in the socket, and the outer pins are damaged.

Awesome
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  Reply # 960889 3-Jan-2014 18:02 Send private message

RunningMan:
Zeon: You can actually put an RJ-11 plug in an RJ 45 socket but i don't think it's recommended.


It will work quite happily. The problem can occur when you need to use an RJ45 back in the socket, and the outer pins are damaged.


Does using RJ12 instead of RJ11 solve this? I've always wondered. Will a RJ12 cable fit into a device (like a phone) that is expecting a RJ11?




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  Reply # 960891 3-Jan-2014 18:18 Send private message

ajobbins:
RunningMan:
Zeon: You can actually put an RJ-11 plug in an RJ 45 socket but i don't think it's recommended.


It will work quite happily. The problem can occur when you need to use an RJ45 back in the socket, and the outer pins are damaged.


Does using RJ12 instead of RJ11 solve this? I've always wondered. Will a RJ12 cable fit into a device (like a phone) that is expecting a RJ11?


Yes because the positions are still there on an RJ11 just not the pins.

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  Reply # 960893 3-Jan-2014 18:22 Send private message

ajobbins: Does using RJ12 instead of RJ11 solve this? I've always wondered. Will a RJ12 cable fit into a device (like a phone) that is expecting a RJ11?


Yes as an RJ11 has the same basic profile as a RJ12 but the 2 outer pins are either blank (not installed) or the plug is molded without the slots - but the same dosent apply the other way around as a RJ12 socket can have the two outer spring pins damaged when a all molded RJ11 or RJ10 is inserted. Just like an RJ45 socket can be damaged with an RJ10, 11 or 12 plug inserted in them (even though it will fit)

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Uber Geek
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  Reply # 961567 5-Jan-2014 16:31 Send private message

They would be suitable. Alternatively I could make some and courier them to you. PM me the length you need for each cable and your physical delivery address for a courier.




Qualified in business, certified in fibre, stuck in copper, have to keep going  ^_^

JWR

121 posts

Master Geek
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  Reply # 961678 6-Jan-2014 02:44 Send private message


If you are making a RJ45 --> RJ11 cable, then what is the best cable to use?

Would you use Cat 5/6 and cut off the spare pairs at the RJ11 end? Or... use a 4 core cable?

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  Reply # 974538 26-Jan-2014 10:57 Send private message

You would use a stranded flat cable. Find an old BT cable that you don't need anymore and chop the BT plug off. Need to use a "flat" RJ45 plug to hold the cable in.




Qualified in business, certified in fibre, stuck in copper, have to keep going  ^_^

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