So if you've got Category 2 cables you should be OK, but if they're only Category 1 you're at the limit. Many HDMI cables under 5 meters of length that were made before the HDMI 1.3 specification can work as Category 2 cables, but only Category 2-tested cables are guaranteed to work. With better quality construction and materials, including 24 AWG (0.205 mm²) conductors, an HDMI cable can reach lengths of up to 15 meters (49 ft.). A cable of about 5 meters (16 ft.) can be manufactured to Category 1 specifications easily and inexpensively by using 28 AWG (0.081 mm²) conductors.

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. This labeling guideline for HDMI cables went into effect on October 17, 2008. Category 1 HDMI cables are to be marketed as 'Standard' and Category 2 HDMI cables as 'High Speed'. 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 720pi60), and Category 2-certified cables, which have been tested at 340 MHz (which would include resolutions such as 1080pp30). Sincere appologies people.Īlthough no maximum length for an HDMI cable is specified, signal attenuation-dependent on the cable's construction quality and conducting materials-limits usable lengths in practice. It's been marked as public so all can view it, now. It's 3m or 5m.).Ĭan someone please watch it and suggest some ideas to getting it working? UPDATEĮeks. (NOTE: I incorrectly said in the video that the hidden wall cable is 10 metres long. Here's the video with the full explanation :. incase the cable in the wall doesn't allow 1080i. I've also tried changing the output format for the TV from 1080i down to 720p and even lower. To better explain all of this, I've made a quick video explaining my problem in detail, so you can exactly see what is going on/wrong.

I have another 3 or 5 metre cable inserted into my wall, so i do not have to have a silly hdmi cable floating in the air between my iMac and my LCD TV. So now I can output video (via the mini Display Port) and sound (via USB) through this box, to my LCD. There is no HDMI output on the iMac so i had to buy one of these bad boys :.

I wish to connect it to my LCD TV using HDMI.

Imac hdmi connector