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Straight-through MDI–to–MDI-X connection for 10BASE-T. The popular Ethernet family defines common medium-dependent interfaces. For 10BASE5, connection to the coaxial cable was made with either a vampire tap or a pair of N connectors.
An Ethernet crossover cable is a crossover cable for Ethernet used to connect computing devices together directly. It is most often used to connect two devices of the same type, e.g. two computers (via their network interface controllers ) or two switches to each other.
Medium-dependent interface (MDI) and medium-dependent interface crossover (MDI-X), types of Ethernet port connections; Microsoft Document Imaging Format, a proprietary file format; Mission Data Interface, an interface developed by NUWC Keyport; Multiple-document interface, a type of software application interface; Multi-Draw Indirect, a ...
Nodes can have two types of ports: MDI (uplink port) or MDI-X (regular port, 'X' for internal crossover). Hubs and switches have regular ports. Routers, servers and end hosts (e.g. personal computers) have uplink ports. When two nodes having the same type of ports need to be connected, a crossover cable may be required, especially for older ...
The free polarity allows PoE to accommodate for crossover cables, patch cables and Auto MDI-X. In mode B, pins 4–5 (pair #1 in both T568A and T568B) form one side of the DC supply and pins 7–8 (pair #4 in both T568A and T568B) provide the return; these are the spare pairs in 10BASE-T and 100BASE-TX.
A cable wired as T568A at one end and wired as T568B at the other end (Tx and Rx pairs reversed) is an Ethernet crossover cable. Before the widespread acceptance of auto MDI-X capabilities, a crossover cable was needed to interconnect similar network equipment (such as Ethernet hubs to Ethernet hubs). Crossover cables are sometimes still used ...
MDI can be confusing if it has a lack of information about the currently opened windows. In MDI applications, the application developer must provide a way to switch between documents or view a list of open windows, and the user might have to use an application-specific menu ("window list" or something similar) to switch between open documents.
Autonegotiation can be used by devices that are capable of more than one transmission rate, different duplex modes (half duplex and full duplex), and different transmission standards at the same speed (though in practice only one standard at each speed is widely supported).