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2. 2.5GBASE-T and 5GBASE-T - Wikipedia

   en.wikipedia.org/wiki/2.5GBASE-T_and_5GBASE-T

   By reducing the original signal rate to 1 ⁄ 4 or 1 ⁄ 2, the link speed drops to 2.5 or 5 Gbit/s, respectively. [5] The spectral bandwidth of the signal is reduced accordingly, lowering the requirements on the cabling, so that 2.5GBASE-T and 5GBASE-T can be deployed at a cable length of up to 100 m on Cat 5e or better cables. [6] [7]

3. Category 5 cable - Wikipedia

   en.wikipedia.org/wiki/Category_5_cable

   Cross section of a cat 5e cable. The Category 5e specification improves upon the Category 5 specification by further mitigating crosstalk. [9] The bandwidth (100 MHz) and physical construction are the same between the two, [10] and most Cat 5 cables actually happen to meet Cat 5e specifications even though they are not certified as such. [11]

4. Power over Ethernet - Wikipedia

   en.wikipedia.org/wiki/Power_over_Ethernet

   In Mode A, pins 1 and 2 (pair 3 in T568A wiring, pair 2 in T568B) form one side of the 48 V DC, and pins 3 and 6 (pair 2 in T568A, pair 3 in T568B) form the other side. These are the same two pairs used for data transmission in 10BASE-T and 100BASE-TX, allowing the provision of both power and data over only two pairs in such networks.

5. Structured cabling - Wikipedia

   en.wikipedia.org/wiki/Structured_cabling

   Regardless of copper cable type (Cat 5e/6/6A), the maximum distance is 90 m for the permanent link installation, plus an allowance for a combined 10 m of patch cords at the ends. Cat 5e and Cat 6 can both effectively run power over Ethernet (PoE) applications up to 90 m. However, due to greater power dissipation in Cat 5e cable, performance and ...

6. Ethernet physical layer - Wikipedia

   en.wikipedia.org/wiki/Ethernet_physical_layer

   Up to 5 m over twinaxial copper cable assembly (4 lanes, 25 Gbit/s each) 100GBASE-CR2 802.3cd-2018 (136) QSFP28, microQSFP, QSFP-DD, OSFP Over twinaxial cable with 3 m reach (two 50 Gbit/s lanes), using RS-FEC 100GBASE-CR1 802.3ck-2022 (162) Single-lane over twin-axial copper with at least 2 m reach 100GBASE-KR4: 802.3bj-2014 (93)

7. Ethernet crossover cable - Wikipedia

   en.wikipedia.org/wiki/Ethernet_crossover_cable

   A crossover cable may also be used to connect two hubs or two switches on their upstream ports. Because the only difference between the T568A and T568B pin and pair assignments are that pairs 2 and 3 are swapped, a crossover cable may be envisioned as a cable with one modular connector following T568A and the other T568B (see TIA/EIA-568 wiring ...