Short Answers Telecommunications
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Synchronous and asynchronous When talking about synchronous and asynchronous in terms of telecommunications, Synchronous signals are those that occur at the same clock rate, given all of the clocks participating in the in the transaction are based on a single reference. In contrast, an asynchronous signal is one that is transmitted at a different clock rate than the other signals. An example of synchronous means that you call an item, it gets executed and when it is completed you get the control back. In contrast, asynchronous you can call an item and you get control back immediately.
XON and XOFF These are flow control methods using the XON and XOFF characters. They control software handshaking, used to determine when data can be sent and/or received. XOFF is used to signal no data should be sent. XON is used to signal data can be sent.
Simplex and duplex - Simplex circuit allows only one-way communication from a transmitter to a receiver. A half-duplex circuit allows two-way communication, but only in one direction at a time, meaning two parties on the connection must take turns transmitting and receiving data...