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QED hdmi lead question

post #1 of 6
Thread Starter 
I bought a 2 meter QED HDMI-P from work the other day and was wondering if anyone knows why it just says P when Ive had 1080i & 1080p through it and both work fine with no problem?
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post #2 of 6
As I understand you're question, you're asking why the packaging said it was for 1080p rather than both 1080p and 1080i.

The answer is that 1080p is higher quality than 1080i so the packaging was probably inferring that the cable is for UP TO 1080p, therefore including 1080i, 720p, etc.

As far as I know, all HDMI cables can handle 1080p. I don't see why they wouldn't
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post #3 of 6
Thread Starter 
Thats what I was thinking, every hdmi cable Ive got can do 1080i, 1080p, 720p etc even some cheap ass £3 one I got from amazon lol
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post #4 of 6
The high end cable industry is a huge scam
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post #5 of 6
Quote:
The HDMI specification defines the protocols, signals, electrical interfaces and mechanical requirements of the standard.[40] The maximum pixel clock rate for HDMI 1.0 was 165 MHz, which was sufficient for supporting 1080p and WUXGA (1920×1200) at 60 Hz. HDMI 1.3 increased that to 340 MHz, which allows for higher resolution (such as WQXGA, 2560×1600) across a single digital link.[41] An HDMI connection can either be single-link (type A/C) or dual-link (type B) and can have a video pixel rate of 25 MHz to 340 MHz (for a single-link connection) or 25 MHz to 680 MHz (for a dual-link connection). Video formats with rates below 25 MHz (e.g., 13.5 MHz for 480i/NTSC) are transmitted using a pixel-repetition scheme.[1]
BUT MORE IMPORTANTLY:

Quote:
HDMI 1.3 defines two cable categories: Category 1-certified cables, which have been tested at 74.5 MHz (which would include resolutions such as 720p60 and 1080i60), and Category 2-certified cables, which have been tested at 340 MHz (which would include resolutions such as 1080p60 and 2160p30).[55][59][60] Category 1 HDMI cables are to be marketed as "Standard" and Category 2 HDMI cables as "High Speed".[1] This labeling guideline for HDMI cables went into effect on October 17, 2008.[61][62] Category 1 and 2 cables can either meet the required parameter specifications for interpair skew, far-end crosstalk, attenuation and differential impedance, or they can meet the required nonequalized/equalized eye diagram requirements
continuing...

Quote:
As of the HDMI 1.4 specification, there are the following cable types defined for HDMI in general:[64][65]
Standard HDMI Cable - up to 1080i and 720p
Standard HDMI Cable with Ethernet
Automotive HDMI Cable
High Speed HDMI Cable - 1080p, 4K, 3D and Deep Color
High Speed HDMI Cable with Ethernet
Cable manufacturers officially are prohibited from marketing the cables by HDMI standard version (for instance "HDMI 1.4 cable") - the cables are distinguished in bitrate support only.


source I know it's a wikipedia link... but it explains it so good!

Also, here is an excellent place to source large amounts of cable. MONOPRICE.COM
Edited by glycerin256 - 6/20/11 at 5:37pm
 
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by ZombieAttack27 View Post
The high end cable industry is a huge scam
Yea I agree! I didnt pay for it though it was bought for me from where I work so I cant complain for getting something for free
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