How is synchronization provided for synchronous transmission?

What is the way to provide synchronization for synchronous transmission?
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"One possibility is to provide a separate clock line between transmitter and receiver. One side (transmitter or receiver) pulses the line regularly with one short pulse per bit time. The other side uses these regular pulses as a clock. An other alternative is to embed the clocking information in the data signal. For digital signals, this can be accomplished with Manchester or differential Manchester encoding. For analog signals, a number of techniques can be used; for example, the carrier frequency itself can be used to synchronize the receiver based on the phase of the carrier."
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"Data transfer method that a continuing stream of internet data signs is definitely together with the right time indicators (developed simply by a digital timepiece) to make certain the vector and the receiver are usually in stage (synchronised) together. The information is sent in prevents (called frames as well as boxes) spaced by fixed time period periods. "
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