Ethernet over twisted pair

Ethernet over twisted pair technologies use twisted-pair cables for the physical layer of an Ethernet computer network. They are a subset of all Ethernet physical layers.. Early Ethernet used various grades of coaxial cable, but in 1984, StarLAN showed the potential of simple unshielded twisted pair.This led to the development of 10BASE-T and its successors 100BASE-TX, 1000BASE-T and 10GBASE-T ...

Category 5 cable (Cat 5) is a twisted pair cable for computer networks.Since 2001, the variant commonly in use is the Category 5e specification (Cat 5e).The cable standard provides performance of up to 100 MHz and is suitable for most varieties of Ethernet over twisted pair up to 1000BASE-T (Gigabit Ethernet). Cat 5 is also used to carry other signals such as telephony and video.

RJ-45 Crossover Ethernet Cable. A good way of remembering how to wire a Crossover Ethernet cable is to wire one end using the T-568A standard and the other end using the T-568B standard. Another way of remembering the color coding is to simply switch the Green set of wires in place with the Orange set of wires.

Cat-5e and Cat-6 cable is sold in pure Copper and in Copper / Aluminum alloy ( Cu/AL ) variations.; Cu/Al is standard at Home Depot etc, and unless specified, assume all CAT-5 isn't copper ; Cu/Al has higher resistance, so the loss is greater.; There is also extremely low cost cable that uses thinner 28 AWG wire on the 45 and 78 pairs, resulting in high loss.

For patch cables, 568-B wiring is by far, the most common wiring method. Virtually all pre-assembled patch cables are wired to the B standard. There is no difference in connectivity between 568B and 568A cables. Therefore, a 568B patch cable should work fine on a 568A cabling system, and visa-versa. Re-use of old cables

Category of cable isn’t relevant; cable category has to do with reduction in the amount of crosstalk among the wires in the cable. Google search found this on Quora: “Normal Ethernet will have up to 12V with a few milliamps of current for communic...

For a 60 meter CAT5 cable, how much DC voltage should I supply to account for voltage drop and still meet the needs of the Raspberry Pi? For a 60 meter CAT5 cable, and let's say a 6V DC power supply - the above passive injector cable will split the current between pins 7 and 8 (meaning each of the two 24 AWG wires will carry between 350mA-500mA).

Notice the capital B vs the lower case b to refer to Bytes vs bits. An Ethernet cable rated at this speed is sometimes also referred to as Fast Ethernet. This is in contrast to a regular Ethernet cable which is rated at 10 Mbps, or Gigabit Ethernet which is rated at 1000 Mbps. 100 BASE-T. The term base is short for baseband signaling. Its ...

in which you can find a Differential-mode voltage of < 2.4 + 19.68 (f / 30) mVpp close enough to 2.5V. (Vpp stands for the voltage differential peak-to-peak, i.e. difference between the lowest and highest voltage in a period.) There's another voltage involved, when using Power Over Ethernet (POE), which range from 37 to 57V.

On the crossovers...I've made a little adapter - if you take a CAT5 jack (especially one that is two-piece, ie. one that has a plastic cover for the wiring - it holds the wiring in place) and wire it for 568B, then wire the plug end for 568A, you can now turn any patch cable into a crossover simply by using the adapter.