Cabling - Twisted Pair (2)
EIA-568A - new standard which covers 150-ohm STP and 100-ohm UTP (year 1995).
- category 1: telephone cable, not suited for data
- category 2: data transmission up tp 4 MBPS
- category 3: transmission characteristics are specified up to16 MHz; data rates up to 16Mbps; four twists per foot;max recommended distance: 90m
- category 4: transmission characteristics are specified up to 20 MHz; not popular
- category 5: transmission characteristics are specified up to 100 MHz; data rates up to 100Mbps; four twists per inch;better performance; more expensive;max recommended distance: 90m
- STP: transmissions at speed 300 MBPS; max distance 90m