What is a DB 9 to 3.5mm quad plug cable used for?

While cleaning up the office today we ran across two odd looking cables still in bags. On one end is a female DB 9 connector and the other end is a 3.5mm plug with 4 contact points. The types of equipment we have are: Dell workstations and servers, HP SANs, Equallogic SANs, Cisco network gear, and symmetricom time servers.

The only thing I found on the net is a speakercraft adapter cable but we've never had anything to do with speakercraft.

UPDATE: We don't have any cameras or video/audio equipment in the area. It can't possibly be for a camera, cell phone, or some other home consumer item since we just can't have that stuff in the area.

Solution 1:

I finally found them. The cable is a firmware upload cable that came with our IOGEAR GCS1644 KVMs.

Solution 2:

We've had them lying around too. They're usually thrown in the box to give you serial console access to a wide variety of gadgets. Have a look for ISDN terminals, video projectors or UPS devices. Could even be a graphing calculator!

Solution 3:

In some cases, it is a specially made Video Cable for Polaroid®'s PDC-300, Fun! 320, & Fun! Flash 640 cameras.