When Accelerating, what Causes a Car to Jerk?

The latest version of the supplement also defines behavior for an Embedded Host which has targeted abilities and the same USB Standard-A port used by PCs. In the default link configuration, the A-device acts as a USB host with the B-device acting as a USB peripheral. It applies to all targeted hosts, including both OTG devices acting as a host and embedded hosts. With OTG, a device can be either a host when acting as a link host, or a link peripheral. The choice between host and peripheral roles is handled entirely by which end of the cable the device is connected to. The accelerator pedal in earlier vehicles is connected to the engine through a cable that is coupled to a linkage connecting to the carburettor or throttle body. You already understand that your cable television company is the best place to get home entertainment, but what you might not be conscious of is that it's also the number one source of high speed web access and home phone service!

To transfer data between two devices, for example from a phone to a printer, the host first reads the data from one device, then writes it to the other. Session Request Protocol (SRP): Allows both communicating devices to control when the link's power session is active; in standard USB, only the host is capable of doing so. Micro-A adapters allow for connection to standard-A plugs, as used on fixed or standard devices. Role swapping does not work through a standard hub, as one device will act as a host and the other as a peripheral until they are disconnected. The latest version of the supplement also introduced HNP polling, in which the host device periodically polls the peripheral during an active session to determine whether it wishes to become a host. The host and peripheral modes may be exchanged later by using HNP or RSP. While the host-device arrangement works for some devices, many devices can act either as host or as device depending on what else shares the bus. The main purpose of HNP is to accommodate users who have connected the A and B devices (see below) in the wrong direction for the task they want to perform.

Role Swap Protocol (RSP): RSP achieves the same purpose as HNP (i.e., role swapping) by extending standard mechanisms provided by the USB 3.0 specification. SuperSpeed Peripheral Capable OTG devices (SSPC-OTG) are not required to support RSP since they can only operate at SuperSpeed as a peripheral; they have no SuperSpeed host and so can only role swap using HNP at USB 2.0 data rates. For instance, a computer printer is normally a device, but when a USB flash drive containing images is plugged into the printer's USB port with no computer present (or at least turned off), it would be useful for the printer to take on the role of host, allowing it to communicate with the flash drive directly and to print images from it. For example, a printer is connected as the A-device (host), but cannot function as the host for a particular camera, since it does not understand the camera's representation of print jobs. The OTG device is allowed to charge and enter host mode. 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).

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). OTG and embedded hosts typically have little battery power to spare, so leaving the USB link unpowered helps in extending the battery runtime. Some manufacturers find clever ways to make a battery charger an even more useful tool. OTG hardware design merges all of the controllers into one dual-role controller that is somewhat more complex than an individual device controller. However, motor cables are more expensive and thicker than control cables due to the more complex core insulation. Framed data bytes are known as slots. Software handshaking is done for example with ASCII control characters XON/XOFF to control the flow of data. A restaurant, for instance, can maximize the use of kitchen equipment and take better control over food storage. You can use headphones that have RCA jacks if you want to hear a stereo signal in its intended form. Tacticus's system had water filled pots at the two signal stations which were drained in synchronisation. However, when the same A-device is plugged into another USB system or a dedicated host becomes available, it can become a device.

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