What Is Control Cable At A Glance > 커뮤니티 카카오소프트 홈페이지 방문을 환영합니다.

To power a USB multiport adapter and charge a connected mobile device that is connected to it at the same time, a 100 W USB-C PD wall charger is typically sufficient. USB multiport adapter: USB-C alt mode cable, USB PD (USB-C) port, a HDMI port, three USB 3.2 ports, an Ethernet port. In particular, if a downstream port of a hub changes status, this change is dealt with in an interaction between the host and this hub; with any hubs between the host and "changed hub" acting as transparent. External "Octopus" or "Squid" hubs (with each socket at the end of a very short cable, often around 2 inches (5 cm) long), or "star" hubs (with each port facing in a different direction, as pictured) avoid this problem completely. For example, if a USB 1.1 device is connected to a port on a USB 2.0 hub, then the TT would automatically recognize and translate the USB 1.1 signals to USB 2.0 on the uplink. OTG hardware design merges all of the controllers into one dual-role controller that is somewhat more complex than an individual device controller. Server computers may use a serial port as a control console for diagnostics, while networking hardware (such as routers and switches) commonly use serial console ports for configuration, diagnostics, and emergency maintenance access.

Hubs may feature power switches for individual ports to allow conveniently power cycling unresponsive devices. Power equals voltage times current. A USB's electric current is allocated in units of 100 mA up to a maximum total of 500 mA per port. Designers assume the user will most likely connect many low-power devices and only one or two requiring a full 500 mA. The standard OTG cable has a mini-A plug on one end and a mini-B plug on the other end (it can not have two plugs of the same type). The type of plug inserted is detected by the state of the ID pin (the mini-A plug's ID pin is grounded, while the mini-B plug's is floating). The type of plug inserted is detected by the state of the pin ID. It can accept either a micro-A plug or a micro-B plug. Although non-standard, micro-B to micro-A receptacle adapters are widely available and used in place of the mandated micro-AB receptacle on these devices. These permit the device to work with USB Accessory Charger Adapters that allows the OTG device to be attached to both a charger and another device simultaneously. Micro-A adapters allow for connection to standard-A plugs, as used on fixed or standard devices.

When an OTG-enabled device is attached to a USB device, such as a flash drive, the device must either end in the appropriate connection for the device, or the user must supply an appropriate adapter ending in USB-A. An OTG product must have a single micro-AB receptacle and no other USB receptacles. However, it does require that packets be transmitted so that the leading edges of any two sequential BREAKs must be separated by at least 1204 μs, and receivers must be able to handle packets with break-to-break times as short as 1196 μs. USB OTG defines two roles for devices: OTG A-device and OTG B-device, specifying which side supplies power to the link, and which initially is the host. An OTG cable has a micro-A plug on one end, and a micro-B plug on the other end (it cannot have two plugs of the same type). The original USB OTG standard introduced a plug receptacle called mini-AB that was replaced by micro-AB in later revisions (Revision 1.4 onwards). Consequently, plugging a device into one port may physically block an adjacent port, particularly when the plug is not part of a cable but is integral to a device such as a USB flash drive.

Note that due to the nature of USB 3.0 hubs have separate logic for the USB 3.0 and 2.0 data and therefore report a HUB device for both protocols. Initially marketed as AppleTalk Personal Network, it comprised a family of network protocols and a physical layer. The transmitting node cannot know that the message has been received by all of the nodes on the CAN network. A hub can be used as an active USB repeater to extend cable length for up to 5 metre (16 feet) lengths at a time. When an OTG-enabled device is connected to a PC, it uses its own USB-A or USB Type-C cable (typically ending in micro-B, USB-C or Lightning plugs for modern devices). This is becoming commonplace with USB Type-C devices. USB cables are limited to 3 metres (10 feet) for low-speed USB 1.1 devices. Self-powered USB hubs are usually more bulky, and more expensive than bus-powered USB hubs. Thus, not all USB 2.0 hubs operate at high speed. On the other hand, electrification may not be suitable for lines with low frequency of traffic, because lower running cost of trains may be outweighed by the high cost of the electrification infrastructure.

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