Cat-6 cable, often called Cat-6, is a cable standard for Gigabit Ethernet and other network protocols, compatible with Cat-5/5e and Cat-3. It offers improved crosstalk and system noise specifications compared to Cat-5 and Cat-5e, delivering up to 250 MHz performance. These cables are Low Smoke Zero Halogen (LSZH), reducing toxic and corrosive gas emissions during combustion.