Imagine coming out of something like a digital signage device or coming outof a computer is a single cable going into a single 50" panel. Then from that panel it goes to a second 50" panel, and from the second to a third, and from third to a fourth. So with nothing more than four pieces of wire, I can power four 50" panels and get four entirely separate x images. This requires a lot of processing power, but just think how much that would simplify something like a small scale digital signage video wall where I'm going to do a 2 x 2 output.
All I need is wire to hook that up, and the way those images work together to create a single larger image or fracture to create smaller images is part of the content. This multi-streaming. I can also do this in a hub configuration where I come out of a computer into a single hub and from that hub into the four panels simultaneously without having to worry about latency.
Multi-streaming is a really important part of DisplayPort 1. If you are in the digital signage business, you are going to get a lot of requests for this technology from those that are involved primarily in financial services, such as banks and market banking facilities. You are also going to encounter this a lot in the medical industry.
DisplayPort seems to be picking up steam when it comes to medical imaging devices. One scenario might be where a laparoscopic camera is being used and the surgeon needs one display that shows the image of the camera and another display that shows the status of the camera; temperature, operating voltages, etc.
The benefit of DisplayPort is that it eliminatesthe need for a ton of cables, which would make this device very bulky.
The downside to DisplayPort 1. In fact, the longest length that we have seen DisplayPort work on is about seven meters. At resolutions of x, we are limited to something more like six feet. You lose some features of the higher level product, but you do get basic compatibility. This is one reason it is so important to understand transition minimized differential signaling and its relationship to HDMI.
Now let's talk a little bit about the practical concerns of the TMDS environment. This is the part I refer to as why it didn't work. First of all, if we are installing a monitor and a display and we get that dreaded black screen of death, chances are we are dealing with EDID ROMs that are coded incorrectly. If the system fails to read these devices, it simply will not give you an image or it will give you an image that really does not work very well.
Fortunately, most of those problems have been addressed in the past two years. So, if you are performing an installation where your client has a 60" plasma panel that was purchased five years ago, and it only has fifty hours on it, youshould be sure that you make allowances to update the firmware. Every single device has the ability to have its firmware updated from the manufacturer's website. Simply download it onto a CD ROM and plug a laptop into a test player on the back of that set and enable it to update the firmware that allows it to work.
EDID ROM that is coded incorrectly is something we don't see as a practical problem if we are using a contemporary product. HDCP authentication failure is a little more common.
We still have some devices on the market that are not HDCP compliant. The main problem is that we either have an issue with repeater implementation or we have an issue with authenticate forever. In some cases the issue may not be related to either one of these, but instead that there is an unacceptable level of latency.
In other words, the delay of switching from one input to another; such as when changing between channels takes too long. Using more sophisticated systems that incorporate key authentication management, such as those created by Crestron and Extron, can eliminate some of that latency and provide flexible switching, of course at a price point that goes along with that level of flexibility.
But do not fear, simple TMDS installations with single point to single point and very simple switching devices are also highly dependable in today's environment.
HDCP authentication failure in these is just not something we see all that often. Something that is a real problem in the TMDS environment is voltage sag. Fortunately, this is limited almost entirely to the world of cable boxes.
Cable boxes are notoriously inexpensive. They are built with very marginal power supplies which is the most expensive part of any electronic gear. These operate on CCM, or current mode logic, which is 3. In other words the receiver that is in your 50" displayis being powered by the transmitter in your Blu-ray player, not by the power supply in the TV.
The power supply in that Blu-ray player must transmit along the HDMI cable and create that hardware handshake. Here is the problem. On almost every switching device whether you are going through a simple Pioneer audio video receiver, a sophisticated JBL Synthesis Pre-Pro or a very sophisticated DVI Gear port matrix, these devices are completely invisible to the signal. What happens with a cable box that has a marginal power supply is this: I plug the cable box directly into a monitor and get an image.
Next, I plug in my DVD player, and I get an image on the projector so I know the cabling between the switcher and the projector is working properly. The issue is that the cable box is not only seeing the three feet into the switcher. It is also seeing the additional 30 feet into the display. So it is actually seeing a total of thirty- five or thirty-six feet, sometimes with extremely small wire gauges and a marginal power supply.
Low voltage sags below 5 volts and it does not power the receiver, so the system fails. We do have a solution for that — a voltage inserter. These problems almost always manifest themselves with cable boxes, occasionally with some inexpensivesatellite boxes, but almost never with any other gear.
So if you are not dealing with cable boxes or satellite boxes, there is no need to worry. Finally, in why doesn't it work , one of the biggest problems we see in the HDMI world today with cheap cables is impedance matching and reflections that compromise data detection.
Obviously, you can go on Monoprice. Do you really want to do that in the context of your own installation? I will tell you that this is the biggest mistake you can make. Cheap cables are made with cheap spiral braids. The spiral shielding is likea Slinky — if I bend it, it opens and I no longer have a shielded cable. It actually changes the characteristic impedance and the very way this high speed data is being transported. Use high quality cables like those that are provided by C2G, and rest assured that you will not experience any issues.
With regard to practical limitations in the TMDS environment, if you are running under 50' using quality interconnects, you will have no problems achieving p. You do not need any amplification. For 65' to ' you will need to use an amplifier. In the analog world the amplifier goes at the rack or head end because the signal must be amplified before it is lost. In the digital world, the signal must be lost before it can be reconstructed via equalization and re-clocking.
In this case a lot of times the amplifier goes at the monitor and not at the source end. Don't make this mistake. This is a common problem I often see. It is just because the wrong device is in the wrong place. From 65' to ' you're probably going to have to use an active buffer, but once again specifying a system where I am going to get x at ' and point to point connectivity is not such a stretch of the imagination. It is actually quite common.
If you need to go between 80' and ', or ' and beyond, certainly consider using Cat5 or Cat6 transfer products for this. They provide full x up to ' with no problems.
There is a new solution coming out on the market called HDBaseT. C2G will introduce its own solution to the market in the coming months. Finally, the last tip is to not forget the lowest resolution rule. I see this happen time and time again. Someone putting together a sophisticated installation wants to add a preview monitor at the rack so the client can make a better choice about what they are seeing and also have various monitors elsewhere. This means that if you put a 14" monitor designed for p into your rack, understand that you set the resolution for your entire installation to p because that is the lowest resolution in the rack.
If you want your entire installation to be p, then every single piece of display gear must be p. You can't have one p display at the end of the line and assume it will be fine. The lowest resolution rule says that the lowest resolution device sets the resolution for the entire installation. There is no functional difference between the two of them, either in resolution, performance or dependability.
Finally, TMDS signals are meant for short distance, point to point connectivity. If we are looking at running signals several hundred feet or more - we have to look at other ways of doing this.
This white paper is for informational purposes only and is subject to change without notice. C2G makes no guarantees, either expressed or implied, concerning the accuracy, completeness or reliability of the information found in this document.
You're currently offline! Learn More! Please place your in-stock order by 3pm ET to ensure it ships today. We apologize for any inconvenience this may cause. All Rights Reserved. View All. Hello, guest Please sign in or create an account. Site Search:. Shop Products. Parent Share twitter facebook. Score: 5 , Informative. Pirates don't even need the analog hole. What a waste of perfectly functional equipment.
No, You'll be able to use adapters Score: 4 , Insightful. I wuv adapters! Re: Score: 3. Score: 5 , Funny. Huh, I thought your karma was so bad you weren't allowed to post anymore. Would it be too big an imposition to become informed about the facts before projecting hate? Score: 4 , Funny. Kyosuke writes: on Friday January 20, PM They started a joint venture with Ubisoft? Score: 5 , Interesting. I'm skeptical of this claim. You didn't call me an "eeeediot". I suspect it is less because they want to close the analog hole..
This is a huge power trip, and executives who push tech companies to do stuff like this successfully will have promotions and new oppurtutnies awaiting them because they showed how far they can piss. HDCP has been broken once and for all. The master key is out there. Score: 4 , Interesting. DVI was confusing to non-geeks. You had, what.. Re: Score: 3 , Insightful. Actually, that's what the override mode should be called: "Just send the goddamn bits".
Re: Score: 3 , Interesting. Re: Score: 3 , Informative. It supports HDCP. Not true. I just had a funny thought last night So, what's your next mov. Or you can use various unlicenced decryption methods, in which case you don't need an HDCP compliant anything. Pirates win again. How exactly do you send sound over DVI? You can with HDMI, so how are they identical? Score: 4 , Informative. Audio data is superimposed in a vertical blanking interval of video data.
It's hilarious really. Because mini-displayport is more expensive, I mean "better". Interesting Score: 5 , Interesting. Study math much? Score: 3. Re:Interesting Score: 5 , Funny.
I guess 25 is almost I, quite literally, own t-shirts older than you. Just sayin' DG. I know they hacked it to support ethernet. Ain't happening Score: 5 , Insightful. Re:Ain't happening Score: 5 , Informative. Deep breath everyone. No difference! Unbunch your panties. Dumb question: why don't they all use micro? HDMI fasteners? Also one of my HDMI cables became damaged because of a sharp angle. Re:HDMI fasteners? That's why DisplayPort is the standard designed for PCs. DP cables have a locking mechanism that works well, without the annoyance of screwing in cables.
In case anyone was wondering Score: 3. This is one of the things that happens when you have three or four video chip sources, including the ones embedded in processors and system logic. It doesn't really matter. Re:It doesn't really matter. HDMI sucks. Remove HDCP and digital video becomes a dream. Gold Line. Cromo Line.
Anthra Line. Black Line. Network CAT. Power 10 Amp 15 Amp International. Video Walls. EDID Emulators. DisplayPort 1. USB Extenders. USB Hubs. Notebook Docking Stations. USB Drive Enclosures. USB Card Readers. USB Webcams. These parameters are: intra-pair skew, with time differential between the two wires making up the pair itself, and inter-pair skew, with time differential between separate twisted pair lines within the cable assembly.
Figure 3 shows the skew time budget for all the components in a system transporting p TMDS video, including the cable. Note that the total allowable intra-pair skew is only 0. Inter-pair skew may not exceed 1. Another parameter of high importance is far-end crosstalk, or FEXT. With STP, this is normally very low, but significant care is required at the receiver termination point. Typical inter-pair skew within a category 5 style cable is easily greater than 7. De-skewing data within networks is the burden of the data receiver.
But, what about longer distances? Certainly, a better solution is needed than even what HDMI promises. Read on. Released in and mapped directly into the DVI, HDCP provides data security for the interface and, hopefully, arrests the piracy concerns of digital content providers.
The DDC is the existing link in the DVI where the source graphics system communicates with the display device to determine its resolution capabilities. An authorized HDMI device will contain secret key values along with a special identifier called the key selection vector, or KSV for short. Each time an HDMI device is connected in a system, a three-part authentication routine automatically occurs. First, shared values, or codes, between devices are exchanged; second, the KSV of each receiver is reported to the source; third, frame-by-frame ciphers are sent to the receivers that enable data decoding.
Referring to Figure 4, HDCP supports interconnection of devices via a hierarchy of sources, sinks, or receivers, and repeaters. All devices in an HDCP system communicate through a protocol designed to allow digital content to travel only to those devices which the source determines have the authorization to receive such content. The hierarchy supports only a limited number of repeaters and total devices.
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