Serial input on my Motorola box is a stereo connector...

[Aramanthes]

My Motorola digital Comcast cable box (model unknown at this time - cause I'm in the office) has a port on the back labeled Serial - but instead of the normal, and expected 9-pin female port it's a stereo jack.

Are there any cables out there that are Stereo out (from the TiVo) to Stereo in (to the cable box) or do I have my connections mixed up?

EDIT: Model DCH 70/2081 (According to the bottom of the box)

[usnret]

Same "wonderment" here. My local (small) cable co. just started providing HD and they brought me a Motorola DCH6416 that has the same "rca" type serial plug in the back , vice the reg. 9 pin one. The manual indicates that it's for "service only". Is there a cable that would work? I went into the diagnostics page of the box and it indicated that that port was "enabled".

[classicsat]

It is my understanding those serial ports are no good for TiVo serial control.
One could try a 1/8" stereo patch cable. One might need to modify it to get TX/RX paths correct. That is assuming it is an RS232 serial on that box.