To reduce the confusion about which cables support which video formats, HDMI defines two categories of cables: Category 1 certified cables, which have been tested at 74.5 MHz (1080i/720p), and Category 2 certified cables, which have been tested at 340 MHz (1600p). Category 1 HDMI cables are to be marketed as "Standard" HDMI cables, and Category 2 HDMI cables are to be marketed as "High-Speed" HDMI cables. This labeling guideline for HDMI cables went into effect on October 17, 2008. Category 1 and 2 cables can either meet the required parameter specifications for inter-pair skew, far-end crosstalk, attenuation, and differential impedance or they can meet the required non-equalized/equalized eye diagram requirements.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. 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).