| 摘要 |
PURPOSE: A method for distributing clocks of a time division switch is provided to synchronize a clock of a 2K side with a frame pulse by combining a self link alarm with the other side alarm. CONSTITUTION: A time division switching board and a control memory/maintenance combination board receive various clocks such as CP3, CP3D, FP3, and CLKF from a link interface board and selects a receiving clock according to a state of the CLKF signal. The CLKF signal becomes low if a self link of the link interface board is normal. The CLKF signal becomes high if the self link of the link interface board is abnormal. A signal formed by combining two alarms is outputted to the time division switching board and the control memory/maintenance combination board. Both sides of A and B receive self-generated clocks when both sides are abnormal.
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