Precise clock distribution for synchronous broadband transmission network

System considerations and precise clock distribution technology are discussed for high-speed fiber-optic systems such as broadband ISDN (integrated services digital network). A precise oscillator is in the central office provides a frequency standard. In each local office, a precise phase-locked loop recovers the standard clock signal. Methods are proposed for fast phase-locking and reducing the slip that occurs when the standard clock signal input is absent.<
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