![]() Strictly speaking, 2-pair Cat5 cable is NOT Cat5 cable. * IEEE 802.3af Power over Ethernet can use the unused 2 pairs (4/5 and 7/8) to deliver power over the data cable to 802.3af-compatible devices like Ethernet or IP Phones, Wireless Access Points, etc. ![]() * 10/100 ports use only 2 pairs (same ones as above). * 100BASE-TX Fast Ethernet uses only 2 pairs (same ones as above). * 10BASE-T Ethernet uses only 2 pairs (1/2 and 3/6). ![]() 4 pairs are in Cat5 cable so that any or all pairs can be used for something.
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