21. The two zones were kept synchronous by a clock signal carried by the crosslink cables. 22. The clock signal is always controlled by the programmer. 23. The usual use of a clock signal is to synchronize transitions in sequential logic circuits. 24. For example, a clock signal is subject to the delays of any other electrical signal. 25. Dual-link DVI displays use two of the TMDS / DisplayPort transmitters and one clock signal each. 26. The process of extracting the clock signal from the data stream is where jitter is introduced. 27. Single-link DVI displays and HDMI displays use one TMDS / DisplayPort transmitter and one clock signal each. 28. "Analog clock " signals are equivalent to the clock signal at pin 3 of DIN sync interface. 29. Like modems, the system locked onto the signal rise and fall times to recreate a clock signal . 30. It can resume processing when the clock signal is restarted, as long as it is kept powered.
