Manufacturer's Response

Evaluations

Manufacturer's Response - Tandberg C20

Page 9
1. Analogue RGB Input EDID Reporting
If the DVI input is set to receive analogue RGB input signals, EDID only reports the following resolutions as being available:
1280 x 720p @ 60 fps
1280 x 768p @ 60 fps
1280 x 800p @ 60 fps
1920 x 1080p @ 60 fps
1920 x 1200p @ 50 fps

Tandberg:
Reading out the EDID from C20 with TC2.1 using Monitor Asset Manager. This is a freely available tool from: http://www.entechtaiwan.com/util/moninfo.shtm

1) From the analogue EDID listed in the report, it looks like only the extension block has been read and not the main EDID. Look at my listing below. I would suspect this is a problem with the unit used to read out the EDID. As you can see the program I used had the opposite problem.

2) As you can see from the below listings the formats claimed not reported via EDID is available on both Digital and Analogue.
EDID listed using the Monitor Asset Manager on a Lenovo X200 connected to a docking station using Windows 7:

Digital:
Monitor
Model name............... C20
Manufacturer............. TAA
Plug and Play ID......... TAA27AB
Serial number............ n/a
Manufacture date......... 2008, ISO week 35
-------------------------
EDID revision............ 1.3
Input signal type........ Digital
Color bit depth.......... Undefined
Display type............. RGB color
Screen size.............. Undefined or variable
Power management......... Not supported
Extension blocs.......... 1 (CEA-EXT)
-------------------------
DDC/CI................... Not supported
Color characteristics
Default color space...... sRGB
Display gamma............ 2,20
Red chromaticity......... Rx 0,625 - Ry 0,340
Green chromaticity....... Gx 0,285 - Gy 0,605
Blue chromaticity........ Bx 0,150 - By 0,065
White point (default).... Wx 0,281 - Wy 0,311
Additional descriptors... None
Timing characteristics
Horizontal scan range.... 24-94kHz
Vertical scan range...... 24-85Hz
Video bandwidth.......... 170MHz
CVT standard............. Not supported
GTF standard............. Not supported
Additional descriptors... None
Preferred timing......... Yes
Native/preferred timing.. 1920x1080p at 60Hz (16:9)
Modeline............... "1920x1080" 148,500 1920 2008 2052 2200 1080 1084 1090 1125 +hsync +vsync
Standard timings supported
640 x 480p at 60Hz - IBM VGA
640 x 480p at 72Hz - VESA
640 x 480p at 75Hz - VESA
800 x 600p at 56Hz - VESA
800 x 600p at 60Hz - VESA
800 x 600p at 72Hz - VESA
800 x 600p at 75Hz - VESA
1024 x 768p at 60Hz - VESA
1024 x 768p at 70Hz - VESA
1024 x 768p at 75Hz - VESA
1280 x 1024p at 75Hz - VESA
640 x 480p at 85Hz - VESA STD
800 x 600p at 85Hz - VESA STD
1280 x 1024p at 60Hz - VESA STD
1280 x 960p at 60Hz - VESA STD
1400 x 1050p at 60Hz - VESA STD
1440 x 900p at 60Hz - VESA STD
1600 x 1200p at 60Hz - VESA STD
1680 x 1050p at 60Hz - VESA STD
EIA/CEA-861 Information
Revision number.......... 3
DTV underscan............ Supported
Basic audio.............. Not supported
YCbCr 4:4:4.............. Not supported
YCbCr 4:2:2.............. Not supported
Native formats........... 0
Detailed timing #1....... 1280x720p at 60Hz (16:9)
Modeline............... "1280x720" 74,250 1280 1390 1430 1650 720 725 730 750 +hsync +vsync
Detailed timing #2....... 720x480p at 60Hz (4:3)
Modeline............... "720x480" 27,000 720 736 798 858 480 489 495 525 -hsync -vsync
Detailed timing #3....... 1280x768p at 60Hz (16:10)
Modeline............... "1280x768" 79,500 1280 1344 1472 1664 768 771 778 798 -hsync +vsync
Detailed timing #4....... 1920x1200p at 60Hz (16:10)
Modeline............... "1920x1200" 154,000 1920 1968 2000 2080 1200 1203 1209 1235 +hsync -vsync
CE video data (timings supported)
1920 x 1080p at 60Hz - HDTV (16:9, 1:1)
1280 x 720p at 60Hz - HDTV (16:9, 1:1)
1920 x 1080p at 30Hz - HDTV (16:9, 1:1)
1920 x 1080p at 24Hz - HDTV (16:9, 1:1)
1920 x 1080p at 25Hz - HDTV (16:9, 1:1)
1920 x 1080p at 50Hz - HDTV (16:9, 1:1)
1280 x 720p at 50Hz - HDTV (16:9, 1:1)
720 x 480p at 60Hz - EDTV (4:3, 8:9)
720 x 576p at 50Hz - EDTV (4:3, 16:15)
640 x 480p at 60Hz - Default (4:3, 1:1)
NB: NTSC refresh rate = (Hz*1000)/1001
Report information
Date generated........... 06.01.2010
Software revision........ 2.43.0.822
Operating system......... 6.1.7600.2
Raw data
00,FF,FF,FF,FF,FF,FF,00,50,21,AB,27,00,00,00,00,23,12,01,03,80,00,00,78,0E,00,B2,A0,57,49,9B,26,
10,48,4F,2F,CF,00,31,59,45,59,81,80,81,40,90,40,95,00,A9,40,B3,00,02,3A,80,18,71,38,2D,40,58,2C,
46,00,10,09,00,00,00,1E,00,00,00,FD,00,18,55,18,5E,11,00,0A,20,20,20,20,20,20,00,00,00,FC,00,43,
32,30,0A,20,20,20,20,20,20,20,20,20,00,00,00,10,00,00,00,00,00,00,00,00,00,00,00,00,00,00,01,BF,
02,03,12,80,4A,10,04,22,20,21,1F,13,02,11,01,E2,00,2A,01,1D,00,72,51,D0,1E,20,6E,28,55,00,10,09,
00,00,00,1E,8C,0A,D0,8A,20,E0,2D,10,10,3E,96,00,04,03,00,00,00,18,0E,1F,00,80,51,00,1E,30,40,80,
37,00,10,0A,00,00,00,1C,28,3C,80,A0,70,B0,23,40,30,20,36,00,10,0A,00,00,00,1A,00,00,00,00,00,00,
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,DB
Analog:
Monitor
Model name............... C20
Windows description...... Generic PnP Monitor
Manufacturer............. TAA
Plug and Play ID......... TAA27AB
Serial number............ n/a
Manufacture date......... 2008, ISO week 35
-------------------------
EDID revision............ 1.3
Input signal type........ Analog 0.700,0.300 (1.0V p-p)
Sync input support....... Separate, Sync-on-green
Display type............. RGB color
Screen size.............. Undefined or variable
Power management......... Not supported
Extension blocs.......... 1 (Reserved - 0x00)
-------------------------
DDC/CI................... n/a
Color characteristics
Default color space...... Non-sRGB
Display gamma............ 2,20
Red chromaticity......... Rx 0,625 - Ry 0,340
Green chromaticity....... Gx 0,285 - Gy 0,605
Blue chromaticity........ Bx 0,150 - By 0,065
White point (default).... Wx 0,281 - Wy 0,311
Additional descriptors... None
Timing characteristics
Horizontal scan range.... 24-94kHz
Vertical scan range...... 49-85Hz
Video bandwidth.......... 170MHz
CVT standard............. Not supported
GTF standard............. Not supported
Additional descriptors... None
Preferred timing......... Yes
Native/preferred timing.. 1920x1080p at 60Hz (16:9)
Modeline............... "1920x1080" 148,500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Standard timings supported
640 x 480p at 60Hz - IBM VGA
640 x 480p at 72Hz - VESA
640 x 480p at 75Hz - VESA
800 x 600p at 56Hz - VESA
800 x 600p at 60Hz - VESA
800 x 600p at 72Hz - VESA
800 x 600p at 75Hz - VESA
1024 x 768p at 60Hz - VESA
1024 x 768p at 70Hz - VESA
1024 x 768p at 75Hz - VESA
1280 x 1024p at 75Hz - VESA
640 x 480p at 85Hz - VESA STD
800 x 600p at 85Hz - VESA STD
1024 x 768p at 85Hz - VESA STD
1280 x 960p at 60Hz - VESA STD
1280 x 1024p at 60Hz - VESA STD
1440 x 900p at 60Hz - VESA STD
1600 x 1200p at 60Hz - VESA STD
1680 x 1050p at 60Hz - VESA STD
Report information
Date generated........... 06.01.2010
Software revision........ 2.43.0.822
Operating system......... 6.1.7600.2
Raw data
00,FF,FF,FF,FF,FF,FF,00,50,21,AB,27,00,00,00,00,23,12,01,03,0A,00,00,78,0A,00,B2,A0,57,49,9B,26,
10,48,4F,2F,CF,00,31,59,45,59,61,59,81,40,81,80,95,00,A9,40,B3,00,02,3A,80,18,71,38,2D,40,58,2C,
45,00,10,09,00,00,00,1E,00,00,00,FD,00,31,55,18,5E,11,00,0A,20,20,20,20,20,20,00,00,00,FC,00,43,
32,30,0A,20,20,20,20,20,20,20,20,20,00,00,00,10,00,00,00,00,00,00,00,00,00,00,00,00,00,00,01,37
Note: For Analog the program doesn’t read out the extension block announced by the codec. So the other supported 16/9 resolutions are not listed here, because the program doesn’t read the extension block. However they are sent out on the EDID and can be read by a Quantum Analyzer. System Boot Up:

2. Analogue RGB and Digital Input EDID Reporting
If the DVI input is set to auto select the input signals, EDID does not report the following resolutions as being available for either analogue RGB or digital signal inputs:
1280 x 1024p @ 60, 75 fps
1440 x 900p @ 60 fps
1680 x 1050p @ 60 fps

Tandberg:
See comment above

Page 12
3. System Boot Up
The system takes a significant period to boot up from cold (nearly 2 minutes), during this time there is no on-screen indication that the system is booting up simply a flashing light on the CODEC and the camera, the user may think that the system is inoperative due to the lack of any on screen feedback.

Tandberg:
First time boot can take a longer period of time because the unit builds configs and does first boot procedures. Subsequently cold boots do take longer than an MXP system for instance due to the nature of the system software/hardware. The flashing green status light does indicate that the system is working so that users are aware the system is starting. Ideally the system should be left in standby mode whenever possible so that it is always able to receive video calls so users other than technicians etc should rarely if ever have to start a system from cold.

Page 14
4. HDMI Monitor Input
When the CODEC output was set to 1080p (the system’s native resolution) and the signals were fed to the main monitor via the HDMI input, a degree of “image cropping” was apparent. This resulted in some menu legends being shifted off screen. In particular the soft key legends were rendered unreadable. If the DVI input on the main monitor was used instead then this cropping was not seen.
The monitors in use for the tests were Dell 2709Wb. There appeared to be a degree of “over-scan” on the monitor HDMI input even though the edge of the active image was visible on the monitor.

Tandberg:
It is a known limitation of certain monitors that they are over scanning images hence cropping the image in emulating the old tube monitors. The HDMI output from the C20 follows standards based signalling for all formats supported. You might find a PC setting/Pixel-by-Pixel (in this monitors case it is "graphics" mode - may only be available on the DVI input) setting to prevent the monitor from cropping the image. We are working on possible work-arounds for these monitors in a future software release.

Page 16
5. Interoperability
In calls to the Tandberg MXP Systems, when PC content was transmitted from the C20 with a resolution of 1280 x 720 the systems negotiated H.239 Content resolution of only 512 x 288 resulting in the received Content image quality being very poor.
In calls to the Lifesize Team Content could not be successfully transmitted from the C20 to the Lifesize. The Content channel opened and closed repeatedly every few seconds.

Tandberg:
In a call to the MXP line when content is shared in a 16:9 format the only matching ratio resolution that the MXP has is 512x288, matching the ratio is prioritised as this ensures no content is cropped from the far end. Wide PC resolutions tend to have slightly different ratios, such as 16:10 and these will display at a higher resolution on the MXP. We are investigating if any improvements can be made to the choice of resolution. With regards to the Lifesize unit, without more detail on the model and software revision it is difficult to comment on the potential cause of the problem.

Additional Tandberg Comments:
The resolution table on page 10 of the report indicates it is possible to send content while having a video resolution of 1080p, this we believe is inaccurate as the C20 can only send video resolutions of up to 720p when content sharing is used.
Also, there is no mention of the optimal definition setting (available from the experimental tab), depending on this setting required bandwidth for any given resolution can be reduced be 25% - 50% depending on the setting used. The requirements for this are that there is a good high level of light in the room so that the codec does not have to deal with excessive picture noise.

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