(B) frequency division multiplexing
(C) time division duplex
(D) frequency division duplex
Answer (A) Time division multiplexing.
A piconet consists of two or more devices occupying the same physical channel (synchronized to a common clock and hopping sequence). The common (piconet) clock is identical to the Bluetooth clock of one of the devices in the piconet, known as the master, and the hopping sequence is derived from the master's clock and the master's Bluetooth device address. All other synchronized devices are slaves in the piconet. The terms master and slave are used only when describing these roles in a piconet. Within a common location, a number of independent piconets may exist. Each piconet has a different physical channel (that is a different master device and an independent piconet clock and hopping sequence). A Bluetooth enabled device may participate concurrently in two or more piconets. It does this on a time-division multiplexing basis. A Bluetooth enabled device can never be a master of more than one piconet (since the piconet is defined by synchronization to the master's Bluetooth clock it is impossible to be the master of two or more piconets). A Bluetooth enabled device may be a slave in many independent piconets. A Bluetooth enabled device that is a member of two or more piconets is said to be involved in a scatternet. Involvement in a scatternet does not necessarily imply any network routing capability or function in the Bluetooth enabled device.
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