J11 and J45 connections

August 21, 2010 at 03:04:18
Specs: Windows XP
I have a brennenstuhiI ISDN SP 6P surge protector. I want to connect this unit in between my broadband filter and my modem input both J11 sockets. The ISDN SP 6P has a J45 male input and a J45 female output. Does anyone know the the plug connections of the J11 and J45 so that I can hard wire in the unit. I have seen a connection diagram but I need to identify which pins of the J11 to connect to the J45

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August 21, 2010 at 05:14:12
Computing.Net to the rescue:


just one of several previous postings on this subject, I wondered why CN has a search box at top of page !!

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August 21, 2010 at 05:31:25
psssst..............GJF60...........it's RJ-11 or -45, not just "J".

Having said that, I've responded to this at least two times, possibly more. An RJ-11 connector will fit in the very center of an RJ-45 socket. Try it, you'll see. That coincides with the blue/not blue pair of wires in a A or B standard. All you should have to do is plug your phone line in each RJ-45 socket and it should work.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***

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August 21, 2010 at 08:33:47
Thanks for your reply, that helps with the RJ11 fitting into the RJ45 socket but I still have to connect the RJ45 plug into the RJ11 socket ADSL output of the broadband filter. The colours are different to what you say but I could just try cutting off the plug and using the 2 center wires. Do you think that would work. I forgot to mention I live in the UK and have a BT line.

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