Telephone cable

The difference from Category 5E to Category 8

Since Category 5e was introduced in 1999, one of the constants in structured cabling has been the 100-meter, 4-connector channel. As data rates have increased, one of the primary differences between category systems is the frequency at which the signal is transmitted over the cable.

Category 7/7A offers a 100-meter 4-connector channel using shielded cabling, and has been designed to transmit signals at a frequency of 1000 MHz. Even though Category 7/7A operates at the higher frequency, there is no corresponding improvement in data rate over Category 6A because 10GBase-T is still the fastest twisted-pair-based data rate recognized by IEEE 802.3. Therefore, even if a Category 7/7A cabling system is installed, any available active equipment would be limited to 10-Gbit/sec performance. Category 7/7A is not a recognized category by TIA.

Category 8 is a significant departure from previous systems in that it uses a frequency of 2000 MHz, and is limited to a 30-meter 2-connector channel. Unlike Category 5e through Category 6A, which could use either unshielded twisted-pair (UTP) or shielded cable construction, Category 8 will require shielded cabling. The most likely cable construction for Category 8 will be 22-AWG S/FTP cabling.

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