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2. Power over Ethernet - Wikipedia

   en.wikipedia.org/wiki/Power_over_Ethernet

   Passive DC-to-DC injectors also exist which convert a 9 V to 36 V DC, or 36 V to 72 V DC power source to a stabilized 24 V 1 A, 48 V 0.5 A, or up to 48 V 2.0 A PoE feed with '+' on pins 4 & 5 and '−' on pins 7 & 8. These DC-to-DC PoE injectors are used in various telecom applications. [57]

3. Autonegotiation - Wikipedia

   en.wikipedia.org/wiki/Autonegotiation

   The base page is sufficient for devices to advertise which ones among the 10BASE-T, 100BASE-TX and 100BASE-T4 modes they support. For gigabit Ethernet, two other pages are required. These pages are sent if both devices have sent base pages with a next page bit set to one. The additional pages are of two kinds: message pages and unformatted ...

4. Gigabit Ethernet - Wikipedia

   en.wikipedia.org/wiki/Gigabit_Ethernet

   Supermicro AOC-SGP-I2 dual-port Gigabit Ethernet NIC, a PCI Express ×4 card. 1000BASE-T (also known as IEEE 802.3ab) is a standard for Gigabit Ethernet over twisted-pair wiring. Each 1000BASE-T network segment is recommended to be a maximum length of 100 meters (330 feet), [5] [a] and must use Category 5 cable or better (including Cat 5e and ...

5. Ethernet physical layer - Wikipedia

   en.wikipedia.org/wiki/Ethernet_physical_layer

   Generally, layers are named by their specifications: [9] 10, 100, 1000, 10G, ... – the nominal, usable speed at the top of the physical layer (no suffix = megabit/s, G = gigabit/s), excluding line codes but including other physical layer overhead (preamble, SFD, IPG); some WAN PHYs (W) run at slightly reduced bitrates for compatibility reasons; encoded PHY sublayers usually run at higher ...

6. Port (circuit theory) - Wikipedia

   en.wikipedia.org/wiki/Port_(circuit_theory)

   In electrical circuit theory, a port is a pair of terminals connecting an electrical network or circuit to an external circuit, as a point of entry or exit for electrical energy. A port consists of two nodes (terminals) connected to an outside circuit which meets the port condition – the currents flowing into the two nodes must be equal and ...

7. 100 Gigabit Ethernet - Wikipedia

   en.wikipedia.org/wiki/100_Gigabit_Ethernet

   Define a single-lane 100 Gbit/s PHY for operation over electrical backplanes supporting an insertion loss ≤ 28 dB at 26.56 GHz (100GBASE-KR1). Define a single-lane 100 Gbit/s PHY for operation over twin-axial copper cables with lengths up to at least 2 m (100GBASE-CR1).