Open/closed captioning.. need some help

Hey guys, I need some guidance if you could.

(I apologize for doing this in the broadcasting forum but I do work with broadcasters and no one else out there seems to understand this stuff like broadcasters do)

I have a need to add open and/or close captions to a live video stream. That stream will then be recorded to a master tape. Seems simple on the face of it, but there are a couple of wrinkles.

1. I'd like to allow remote CART access to do the captioning, and preferably over the internet versus dial-in. This isn't a show stopper, just a preference.

2. I'd like to be able to send either HD or SD video inbound to the encoder. At this point, I need to caption our legacy SD video and caption our new HD generated productions as well.

3. The biggie. Most of the encoders I've seen give me a choice of either an HDI or SDI out connection. I do not have either on my recording devices. Is there a unit available that offers both an HD/SD SDI out AND something component/composite/1394 out? I'd like to hook this to an NTSC SD recorder for the moment until we can upgrade to something that can properly handle HD.

I'd be HUGELY grateful for information regarding this.

Thanks,

Perrone Ford
FL Supreme Court