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Thus, USB cables have different ends, A and B, with different physical connectors for each. Each format has a plug and receptacle defined for each of the A and B ends. A USB cable, by definition, has a plug on each end—one A (or C) and one B (or C)—and the corresponding receptacle is usually on a computer or electronic device.
USB signals are transmitted using differential signaling on a twisted-pair data cable with 90 Ω ± 15% characteristic impedance. [6] Low speed (LS) and Full speed (FS) modes use a single data pair, labelled D+ and D−, in half-duplex. Transmitted signal levels are 0.0–0.3 V for logical low, and 2.8–3.6 V for logical high level.
An alternative to this is a compound device, in which the host assigns each logical device a distinct address and all logical devices connect to a built-in hub that connects to the physical USB cable. USB endpoints reside on the connected device: the channels to the host are referred to as pipes.
An attempt by Apple to deal with cable clutter, by combining five separate cables from computer to monitor. Female port (20-pin) Digital Flat Panel (DFP) Used with the PanelLink digital video protocol. Deprecated. Made obsolete by DVI. 3D model of a UDI connector Unified Display Interface: Proposed to replace both DVI and HDMI.
By this convention, the connectors on serial bus cables are "male plugs", and the corresponding connectors on equipment are "female jacks". A casual glance at a USB Type-A plug may give the false impression that it is hermaphroditic. However, an attempt to mate two USB Type-A plugs reveals the fact that the connectors cannot connect.
Examples of computer connector sockets on various laptops Ports on the back of the Apple Mac Mini (2005). A computer port is a hardware piece on a computer where an electrical connector can be plugged to link the device to external devices, such as another computer, a peripheral device or network equipment. [1]
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A four-port "long cable" "external box" USB hub A four-port "compact design" USB hub: upstream and downstream ports shown. A USB hub is a device that expands a single Universal Serial Bus (USB) port into several so that there are more ports available to connect devices to a host system, similar to a power strip.