Ivor Jones formulated the question :
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>> Is this device a 3 port device....with only 2 ports..?[/color]
>
> Simple, the first two ports have RJ11 sockets, the third has a small terminal
> block into which you have to insert 2 wires. I suppose there wasn't room for
> 3 RJ11 sockets.
>
> Ivor[/color]

One RJ45 could power three 2-pair analogue ports.