O
Oppie
- Jan 1, 1970
- 0
Is there any standard for modular phone connectors? I suspect not since was
looking up the 4p4c headset jack (referred to as RJ9, RJ10 and RJ22), I
don't recall that any of the manufacturers indicated pin numbers. Of course,
it also is complicated by whether the connecting cable is 1:1 or cross-over.
RJ11 is often confused as it is wider and though has also 4 circuits
connected, is actually spaced for 6 circuits.
Was connecting up a demo board this morning that used the 4p4c modular
connector for the CAN bus. Cannibalized a connector and cord from an old
telset. Became a smoke generator inadvertently. Luckily, no damage and all
worked after I mirrored one of the sockets. The telco handset cord was
cross-over type and luckily had enough impedance to get hot rather than
killing anything else (5V and ground in it).
looking up the 4p4c headset jack (referred to as RJ9, RJ10 and RJ22), I
don't recall that any of the manufacturers indicated pin numbers. Of course,
it also is complicated by whether the connecting cable is 1:1 or cross-over.
RJ11 is often confused as it is wider and though has also 4 circuits
connected, is actually spaced for 6 circuits.
Was connecting up a demo board this morning that used the 4p4c modular
connector for the CAN bus. Cannibalized a connector and cord from an old
telset. Became a smoke generator inadvertently. Luckily, no damage and all
worked after I mirrored one of the sockets. The telco handset cord was
cross-over type and luckily had enough impedance to get hot rather than
killing anything else (5V and ground in it).