Yes RJ12 and RJ11 are compatible. Just the pin number
difference.

http://www.zytrax.com/tech/layer_1/cables/cables_jacks.htm

John


--- Vitaliy <spam@maksimov.org> wrote:

> Anon wrote:
> > Can any of you recommend a specific component for
> the 6-pin RJ12 jack that 
> > connects to the PIC ICD2 debugger (manufacturer &
> part#). I need a PCB 
> > mounted one (through hole or SMD).  There seems to
> be many options: 
> > positions, contacts loaded, contacts per port, #
> of ports. I am not sure 
> > if "modular jack" refers to RJ-11 or RJ-12. I know
> the ICD requires an 
> > RJ-12. Thanks
> >
> Bob Axtell wrote:
> > Yep. AMP/Tyco makes a quality mate
> (AMP#5555163-1), Digikey # A31420-ND.
> > They have a slightly faded PDF of the footprint,
> too at DK.
> 
> It looks like that particular connector is out of
> stock. I used the AMP's 
> 555165-1, which Digikey has 7161 of. It's the same
> connector found in 
> Eagle's con-amp.lbr.
> 
> AFAIK, the difference b/w an RJ-11 and RJ-12 is the
> footprint. RJ-11 can 
> have a maximum of four contacts, and RJ-12 can have
> six. Mechanically, they 
> seem to be identical (you can plug an RJ-11 into an
> RJ-12). Perhaps someone 
> knows for sure?
> 
> Best regards,
> 
> Vitaliy
> 
> 
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