Duplex RS232 is point to point only and requires the UTx 232, AK500 232, AK1000S, AK1500S. (eg UTX 232 to AK500 232
| Transmit |
Receive |
RS232 |
| UTX RS232 |
AK500 RS232 |
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In any type of distribution system (T4's, daisy chain, switches, 9D's) serial transmission must be one way Simplex.
The UTx and AK500, AK500DP have simplex serial built in, configurable via jumpers. AK1000S, AK1500S still require the serial daughterboard set to Simplex mode 1.
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UTx & AK500 combination:
The Magenta products continue to push the boundaries of UTP transmission line technology.
Utilising a UTx and an AK500, we can now send YUV (component video) AND Composite video down a single UTP cable. This relies on the Composite signal being sent down the Aux Pair, the fourth pair. The table on Page 6 of the Ak500 manual indicates this in the section "Composite, S-Video and Component Video"
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SA Series use 9600 baud only. This is not changable.
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Activity" LED on the Calypso ION-LT blinks only sonly when the Com port receives data.
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Magenta Distances - It relates to the distance rating on Magenta receivers when using non computer video.i.e. Composite, S-Video and Component signals.
This information is very important and further extends the reputation of Magenta Research as being "state of the Art" in UTP transmission. Knowing and understanding this allows the use of the low cost MV250 receivers to be used on distances approaching 229m (750ft)
Magenta’s engineers typically use the "plus 152 metres” rule of thumb for Composite video, S-Video, and even Component. This means you take the rated distance of Computer video for our receivers and add 152m which determines how far you can go with non computer video.
Note that some projectors may be fussy about this and you may need to back off on the cable length and I would test true HD signal's to make sure they look good. Other than that, the +152 rule of thumb should work in almost all cases.
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Skew Compensation:
The MV250 does not come with any skew compensation as it's not needed for this short cable range
The AK500 comes standard with 10ns of skew-compensation (on or off) .
The AK1000 does not come standard with any skew-compensation, but has an option called Aku-Comp which provides 31ns of skew-comp per colour, in 1ns increments. The only way to get skew compensation is IF the optional Aku-Skew board is fitted !
The distance compensation switches which are used to equalise, not the differing pair lengths (which is skew) but the effects of cross talk, intercable modulation, smearing etc. by adjusting the multi-pole filtering.
Additionally there is an adjustment knob for fine tuning the distance compensation switch settings (as it has only three preset distances 0-500, 500-1000 and 1000-1500)
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| Green Shift / Green Washout on the STx units
Please note that the new low cost STx does not have the DC restore capabilities for video inputs signals like the UTx does.
The STx is like the old MV450 Tx unit which could suffer from Green Shift / Green Washout on Multimedia Signals if AC coupled video was trying to be used.
Original MV 450 manual had the following warning:
Standard MulitView 450 is designed to function with DC coupled signals with the black level referenced to 0 volts. Nearly all VGA cards function this way.
However, some Media Servers or digital camera devices provide AC coupled signals and can cause a green color shift in the video. This is a result of the sync clamping on the Red and Blue channels in the MulitView 450. For three component (R/G/B or Y/Pb/Pr), AC coupled video, special versions of the MulitView 450 Transmitter and Receiver are available. For five component (RGB/H&V) AC coupled video, an optional DC restoration adaptor needs to be installed between the AC coupled source and the Transmitter. Please contact Magenta Research if you are experiencing these difficulties.
The solution is to use a UTx.
FYI:
Video-equipment makers have a tacit agreement to AC-couple the input of their equipment, and DC-couple the output—requiring the next stage to re-establish the DC component . Failure to establish such a protocol leads to "double coupling," where two coupling capacitors appear in series, or to a short where there are no capacitors.
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Infinea not compatible with Mondo Matrix
Please note Magenta Research Infinea product is not compatible with their Mondo Matrix, 8x8, 16x16 or 9D products
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K500TD's and adjustment for skew compensation, please note:-
Maximum source-to-display distance is 500 ft. for computer video, 750 ft. for HDTV or component video and 1000 ft. for composite or S-video.
“Skew-free” or low skew cable is recommended since K-500 receivers do not feature any built-in skew compensation.
Shielded or plenum-version cable is not needed as all MultiView Series equipment is insensitive to electrical noise.
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Audio Problem
The audio level through Magenta pair was down when compared with a straight coax run between the source and the display. Customer was using the "summed" audio and had done some fault finding and could find no explanation for it in the manuals.
The reason is the audio system is setup as a true "summing circuit".
Therefore when both channels carry the same signal, such as during the presentation of a mono program, the signals are ADDED togerther. This is considered as unity gain. However IF, as was the case, the customer was only connecting to one side of the phoenix (2 pins), the signal will be 1/2 as strong. In fact reduced by 6dB, or cut in half. If they didn't take this approach, stereo connections that carry mono content would be presented at 2X gain (+6dB) and this would cause more problems like excessive level or clipping problems. Since there is not a stereo/mono switch or jumper, Mono sources should be bridged to pins 1 & 3 to provide unity gain through the system. With Pin 2 being used for Gnd.
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Infinea Reduced Blanking
As you should all know the Infinea range is designed to transporting 1080i and yet it can also handle a reduced blanking, 1080p DVi signal.
Reduced blanking, what is this ?
Reduced blanking has been created to save bandwidth on flat panel displays, where the sync and blanking may be reduced as there's no electron beam that has to be repositioned from one side of a CRT to the other. What this means is that you can display the same resolution at the same frequency, while using much less bandwidth.
Unfortunately the DVI format supports CRT displays and as such it had to supported blanking in the DVI signal, which has gaps between each scanline and each frame, just like an analogue signal, during which it sends nothing but null bytes.
1920x1080 is pushing the limits of (single-link) DVI's bandwidth using normal (CRT-style) blanking, but if you use shorter blanking periods (reduced blanking), there's less data to send, so you can use a lower data rate, = less bandwidth.
Note : 1080i uses almost the same bandwidth as 720p.
This is the 1080p spec as recommended by Magenta engineers for infinea.
- Pixel clock (MHz):145.46
- Horizontal active (pixels):1920
- Horizontal blanking (pixels):280
- Vertical active (lines):1080
- Vertical blanking (lines):45
- Horizontal Sync offset (pixels):88
- Horizontal Sync pulse width (pixels):44
- Vertical Sync offset (lines):2
- Vertical Sync pulse width (lines):5
- Horizontal image size (mm):885
- Vertical image size (mm):498
- Scanning mode: Non-interlace
- Stereo:
Normal
display, no stereo
- Sync mode: Digital Separate, VSYNC polarity +, HSYNC polarity +.
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