HDTV feed
to feed the HDTV signal into the cable network

Im Streit um die HDTV-Einspeisung der öffentlich-rechtlichen Angebote Das Erste HD und ZDF HD beim Kabelnetzbetreiber Kabel Deutschland (KDG), (...) Kabelnetzbetreier, die bereits die HDTV-Angebote einspeisen, dafür von den Öffentlich-Rechtlichen extra honoriert werden.
http://www.digitalfernsehen.de/news/news_8752...

Synonym zu "aufschalten" = "einspeisen"
Siehe Wörterbuch: einspeisen

ARD is paying cable companies to feed the ARD-HDTV signal into their cable TV networks.
It is ARD who is paying and the cable providers who demand these payments.

I'm sorry, but "feeding in" TV just sounds awful. Is there not another word here?

ABC HDTV feed may be down next week -- Engadget HD
Update: The WMTW Chief Engineer confirmed that an ABC memo indicates that ABC HDTV feeds will be down across the nation next week. Thanks, WMTW!We'r.
hd.engadget.com/2005/08/.../abc-hdtv-feed-may-be-down-next-week/

BBC America promises HD feed announcements "soon" -- Engadget HD
As we mentioned, BBC America's HD launch hasn't gone off with quite the bang we'd hoped, since it isn't carried anywhere yet. We called over.
hd.engadget.com/.../bbc-america-promises-hd-feed-announcements-soon/

BBC Studios and Post Production - News Archives
For Children In Need 2009, there will be nine OBs delivering a mixture of HD and SD feeds into Television Centre – for example the feeds from the BBC's ...
www.bbcstudiosandpostproduction.com/about/.../091117_cin.html

How to Feed the Signal from a Home Security Camera to a Television ...
How to Feed the Signal from a Home Security Camera to a Television ... How to Feed the Signal from a Home Security Camera to a Television | Provided by ...
www.answerbag.com/.../reality-television

@ 2: The word is "the feed", and "feeding a signal to ..." is a common expression in this context. This is the best I can come up with, anyway.

http://www.thefreedictionary.com/feed
To distribute (a local radio or television broadcast) to a larger audience or group of receivers by way of a network or satellite.

Das habe ich noch gefunden. "Broadcast" müsset in diesem Zusammenhang eigentlich auch funktionieren.

is this about an HDTV upgrade? HDTV content? What's the context?

add-on, perhaps? the more I think about it, HDTV add-on seems to be correct here. I do agree, though, "feed" doesn't fit here.

This comes back to some general translation problems I've had with "einspeisen" - "feeding in" or "feeding" channels onto a TV network simply isn't good, commonly-used English.

I have tended to use "bringing in/bringing onto the network" myself. I'm not sure what native speakers would think of this as a translation for "einspeisen."

"ARD pays other cable TV systems to carry the ARD-HDTV programme/signal"

A must-carry rule requires all cable TV systems to carry local broadcast stations on their lineups.
http://en.wikipedia.org/wiki/Cable_television...

Everything I read about "Aufschaltung" seems to point to either an installation or some other kind of "newness" or "addition":

http://www.proz.com/kudoz/german_to_english/c...
Aufschaltung
English translation: installation

http://www.woxikon.com/wort/aufschaltung.php
English
add-on; feedforward

http://www.woxikon.com/wort/rf-kanal-aufschal...
English
RF combining circuit

http://www.proz.com/kudoz/german_to_english/p...
aufschalten
English translation: to add on

http://www.dict.cc/deutsch-englisch/Aufschalt... {n} [Vermittlungstechnik: mit bereits besetztem Anschluss verbinden]
offering
entering
intrusion
trunk offer
telecom. breaking-in