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One person has suggested: "Its a very small amout of voltage. Usually microvolts." This is somewhat inaccurate, but only by a factor of around 1,000,000 times too small. A more accurate number is: "around 2.5 volts peak differential". Your typical consumer LAN uses 10Base-T signalling over a Category 3, 4 or 5 twisted-pair cable. The 10BASE-T transmitter output voltage specified in the standard (IEEE 802.3-2005 14.3.1.2.1) requires a peak differential voltage of 2.2 to 2.8 V into a 100-Ohm resistive load. There are IEEE technical discussions (March 2007) about reducing it to below 2 volts, perhaps using a "negotiation" protocol for devices on the LAN to choose a lower voltage if they are capable.

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15y ago

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