user10407: For example, I know that HDMI cables explicitly do not send a CC signal to the TV, even if the source and TV both support it.
I assume that coax cable does support it since I can use a digital antenna and receive CC on my TV from digital over the air broadcasts (in the US).
Is there any other cabling that will carry the actual CC signal for the TV to decode?
I am currently sending a DVI signal to projectors in an auditorium and I am sending the same image by VGA over CAT5 to HDTVs in our lobby. We may need to add Closed Captioning to the lobby feed only so I do not want to change the image going to the projectors in the auditorium.

user3908: Your question was initially confusing because you had focused on "cables" which is not the correct way of looking at this.
Once you've decoded a video signal to components, the closed captions are no longer available. If they were not inserted as open captions (aka subtitles) then they're simply not there.
So any transport that removes the Line 21 caption data or the digital caption packets eliminates your ability to defer captioning at the distant end -- you must insert the captions / subtitles before transport. That's the case with DVI / VGA / HDMI.
If you must allow the ability to choose a captioned or non-captioned display at the distant end, you would have to send two component feeds (e.g. two CAT5s), one captioned and one plain, and A/B switch them at that end.

user18682: The closed caption information in the HDMI component is lost when you convert that digital format into a VGA signal, which is analog: The closed caption information is not injected into line 21 of such standard therefore the closed caption information is not there.
Closed caption information is handled very different in a digital signal than in the NTSC standard. You need a microprocessor to extract the signal from the digital HDMI cable and re-build and inject it into line 21 of your analog VGA signal.
In other words: VGA and NTSC both use the same Closed Caption analog format. HDMI and VGA & NTSC are two different worlds and the digital information will never be available to your monitor the way it needs it. By design the information is simply not there.
To handle this need you have three solutions assuming you want to use the CC decoding capabilities and features of your VGA/NTSC monitors: a) One is the offered before: It requires a separate processor to decode from HDMI and encode to VGA/NTSC standard. This is easily accomplished using Linux-based software gear. b) The other solution is to keep your transmission DIGITAL through your UTP cabling all the way. This means not to convert to Analog and inject the signal directly to your HDMI input in your remote monitors (assuming you have HDMI input capabilities in such monitors). For this purpose you need to get HDMI UTP extensors (not VGA) like these: http://www.ebay.com/bhp/hdmi-over-cat5 .
c) A very elegant alternative would be to use HD modulators and send the signal in a unused HDTV channel (for instance 39.1) and feed the signal through a coax cable to the tuner connector of each TV monitor (assuming they have an HDTV tuner circuitry). Something like these can do the job: http://www.pviusa.com/MICROMOD-Compact-HD-RF-Modulator_p_72.html?gclid=CjwKEAjwz9HHBRDbopLGh-afzB4SJABY52oFUGrfVR-DYY4ljXhNVtX5lBiCUwFMPvYUBERhZUVGpRoCH8Hw_wcB .
If recabling is not an option and your monitors are, indeed, HDTV and you have to stick to UTP cabling then your best option is (b): HDMI extensors through UTP. It is a mistake changing from HD Digital format to VGA Analog and then to HD digital again in the other end!. I guess you may want to grab some of these gadgets from EBAY.

user18884: I don't mind the question. I think of it in those terms too. So HDMI, DVI, VGA no.  Composite, SDI, and RF yes.  Composite is typically a Yellow RCA or can be BNC coax.  SDI (HD, SD, 3G) is also BNC Coax.  When you say Coax above you are referring to RF, which comes in both analog NTSC and digital ATSC versions, both of which support CC, and typical cable ends are F connectors.  Composite and NTSC are SD resolution, so if you want to go HD your choices are SDI or ATSC RF.  For the latter, a simple monitor will not do, it has to include an ATSC tuner.  But if HDMI is anywhere in the chain, CC is lost. SDI connectors on monitors are rare/expensive, so probably not an option.  Only other option is to decode the image twice in your studio, one with opened captions and one without, and send one to the lobby and the other to your projectors.

10407: <p>For example, I know that HDMI cables explicitly do not send a CC signal to the TV, even if the source and TV both support it.</p>

<p>I assume that coax cable does support it since I can use a digital antenna and receive CC on my TV from digital over the air broadcasts (in the US).</p>

<p>Is there any other cabling that will carry the actual CC signal for the TV to decode?</p>

<p>I am currently sending a DVI signal to projectors in an auditorium and I am sending the same image by VGA over CAT5 to HDTVs in our lobby. We may need to add Closed Captioning to the lobby feed only so I do not want to change the image going to the projectors in the auditorium.</p>
 3908: <p>Your question was initially confusing because you had focused on "cables" which is not the correct way of looking at this.</p>

<p>Once you've decoded a video signal to components, the <strong><em>closed</em></strong> captions are no longer available. If they were not inserted as <strong><em>open</em></strong> captions (aka subtitles) then they're simply not there.</p>

<p>So any transport that removes the Line 21 caption data or the digital caption packets eliminates your ability to defer captioning at the distant end -- you must insert the captions / subtitles before transport. That's the case with DVI / VGA / HDMI.</p>

<p>If you must allow the ability to choose a captioned or non-captioned display at the distant end, you would have to send two component feeds (e.g. two CAT5s), one captioned and one plain, and A/B switch them at that end.</p>
 18682: <p>The closed caption information in the HDMI component is lost when you convert that digital format into a VGA signal, which is analog: The closed caption information is not injected into line 21 of such standard therefore the closed caption information is not there.
Closed caption information is handled very different in a digital signal than in the NTSC standard. You need a microprocessor to extract the signal from the digital HDMI cable and re-build and inject it into line 21 of your analog VGA signal.
In other words: VGA and NTSC both use the same Closed Caption analog format. HDMI and VGA &amp; NTSC are two different worlds and the digital information will never be available to your monitor the way it needs it. By design the information is simply not there.
To handle this need you have three solutions assuming you want to use the CC decoding capabilities and features of your VGA/NTSC monitors: a) One is the offered before: It requires a separate processor to decode from HDMI and encode to VGA/NTSC standard. This is easily accomplished using Linux-based software gear. b) The other solution is to keep your transmission DIGITAL through your UTP cabling all the way. This means not to convert to Analog and inject the signal directly to your HDMI input in your remote monitors (assuming you have HDMI input capabilities in such monitors). For this purpose you need to get HDMI UTP extensors (not VGA) like these: <a href="http://www.ebay.com/bhp/hdmi-over-cat5" rel="nofollow noreferrer">http://www.ebay.com/bhp/hdmi-over-cat5</a> .
c) A very elegant alternative would be to use HD modulators and send the signal in a unused HDTV channel (for instance 39.1) and feed the signal through a coax cable to the tuner connector of each TV monitor (assuming they have an HDTV tuner circuitry). Something like these can do the job: <a href="http://www.pviusa.com/MICROMOD-Compact-HD-RF-Modulator_p_72.html?gclid=CjwKEAjwz9HHBRDbopLGh-afzB4SJABY52oFUGrfVR-DYY4ljXhNVtX5lBiCUwFMPvYUBERhZUVGpRoCH8Hw_wcB" rel="nofollow noreferrer">http://www.pviusa.com/MICROMOD-Compact-HD-RF-Modulator_p_72.html?gclid=CjwKEAjwz9HHBRDbopLGh-afzB4SJABY52oFUGrfVR-DYY4ljXhNVtX5lBiCUwFMPvYUBERhZUVGpRoCH8Hw_wcB</a> .
If recabling is not an option and your monitors are, indeed, HDTV and you have to stick to UTP cabling then your best option is (b): HDMI extensors through UTP. It is a mistake changing from HD Digital format to VGA Analog and then to HD digital again in the other end!. I guess you may want to grab some of these gadgets from EBAY.</p>
 18884: <p>I don't mind the question. I think of it in those terms too. So HDMI, DVI, VGA no.  Composite, SDI, and RF yes.  Composite is typically a Yellow RCA or can be BNC coax.  SDI (HD, SD, 3G) is also BNC Coax.  When you say Coax above you are referring to RF, which comes in both analog NTSC and digital ATSC versions, both of which support CC, and typical cable ends are F connectors.  Composite and NTSC are SD resolution, so if you want to go HD your choices are SDI or ATSC RF.  For the latter, a simple monitor will not do, it has to include an ATSC tuner.  But if HDMI is anywhere in the chain, CC is lost. SDI connectors on monitors are rare/expensive, so probably not an option.  Only other option is to decode the image twice in your studio, one with opened captions and one without, and send one to the lobby and the other to your projectors.</p>
