utp - What is the reason for T568A and T568B termination? - Network . . . UTP cables used in the 586 standard inherited their color code from the 25 pair color code developed by AT T for cabling used in telecommunication purposes The following table shows the combination of colors to be used for each pair This gives us this set of combinations: UTP cabling simply used the first four combinations The order used in 586a and 586b is compatible with 1-pair and 2-pair
网线HSYU-55D UTP-5e是五类线还是超五类线？ - 知乎 你好，非常感谢你的邀请。从字面上的意思来说：这是一款 超五类网线。并且是非屏蔽的。现在市面上已经没有 五类线 了。根据国家最新的网线标准《数字通信用聚烯烃绝缘水平对绞线》（YD T 1019-2013）的要求：已经取消了五类线的标准，使用超五类线缆的标准取代原有的标准。
layer1 - Why does an Ethernet cable have four pairs? - Network . . . Because they are not ethernet cables, but UTP cables that have various applications, ethernet being only one possible application, and the cabling standard is four pairs for UTP cabling Ethernet can also run on fiber optic cabling, and those are also not ethernet cables
layer1 - What do the positive and negative (+ -) transmit and receive . . . Two ways to go as I see, use the fiber to transmit the analog UTP signal or to transmit the digital data after decoding it from the UTP signal You could convert the analog signal from the UTP to transmit over fiber via whatever scheme you're interested and then just pump that signal back into UTP on the other side