6P4C - which telephone plug does this apply to

So I am looking at modem cables - (united kingdom)  so you have the BT plug - the thicker one going into the wall and then the smaller one that goes into the routers / modem.

Some sites call both these cables 6P4C while others say - BT Plug 6P4C to RJ11

So which one is it - or is it both - they are both 6P4C then you have to define further ( line in USB - male or female and so on )

I would also like the know the difference between the 2 / 4 and 6 pin on these BT plugs - im supposing some the extra ones are for power but which one should be used for a modem and them a telephone - or if you have the 6 pin can you do what ever you like and the device will take what it needs.
nathan1038Asked:
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David WallCommented:
RJ 11 is the router end 6P4C is often at the wall socket end though with most UK domestic adsl routers the cable supplied is RJ11 to RJ11 and you then connectiot that into a filter which in turn plugs into the wall.

In the UK the most common way of connecting a telecommunications device to the telephone line is a BT plug. This is pretty much unique to the UK and comes in two types:

431A BT 4 way plug (6P4C)
631A BT 6 way plug (6P6C)
The 4 way plug is the standard one used on home and small business telephones. The 6 way plug is commonly used on larger telephone systems and the extra pins are used to transmit control signals which vary from manufacturer to manufacturer
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nathan1038Author Commented:
Or should I be refering to the BT cable as a BT Plug 431 A or BT Plug 631 A - which name is actually correct and should be used - ( just a presumption here but could it be that the 431 has 4 pins while the 631 has 6 )

 
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David WallCommented:
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nathan1038Author Commented:
Ah, thats for your quick reply there wallD - I wrote the above not knowing you replied. When you say 4 way - tecnically im sure there is lots of information on that but does that also correspond to the number of pins in the plug - therefore 4 pins for the 4 way.  Also - is there a difference between the plug you would use for a dial up / fax modem and to a telephone - i.e. would a fax / dial up modem use the 431A and a telephone too.

I have also seen 6P2C with the same image of the BT plug - does this mean the same plug with 2 pins / 2 way - what are those used for ( it mentioned use with a modem )
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David WallCommented:
The cable should be called a rj11 to 6P4C cable or often it is called RJ11 to BT

There are different wirings for different applications  as discussed on the web page. You would need to check with the supplier manufacturer about suiability for your particular use, though usually the product description is fairly clear.

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nathan1038Author Commented:
nice one mate
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David WallCommented:
Thnx
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