Class F Cable
Class F cable is a cable standard for Ethernet and other interconnect technologies that can be made to be backward compatible with Class D and Class E. Class F features even more strict specifications for crosstalk and system noise than Class E. To achieve this, shielding has been added for individual wire pairs and the cable as a whole. Besides the foil shield, the twisting of the pairs and number of turns per inch increases RF shielding and protects from crosstalk. Class F is recognized for all the country organizations members of ISO.
The Class F cable standard has been created to allow 10 Gigabit Ethernet over 100 m of copper cabling (also, 10 Gbit/s Ethernet now is typically run on Cat 6a). The cable contains four twisted copper wire pairs, just like the earlier standards. Class F can be terminated either with 8P8C compatible GG45 electrical connectors which incorporate the 8P8C standard or with TERA connectors. When combined with GG45 or TERA connectors, Class F cable is rated for transmission frequencies of up to 600 MHz.
As of November 2010, all manufacturers of active equipment have chosen to support the 8P8C for their 10 Gigabit Ethernet products on copper, and not the GG45 or TERA in order to function on Cat 6a. Class F is not currently recognized by the TIA/EIA.
Read more about this topic: ISO/IEC 11801
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