| 摘要 |
In one embodiment, a telecommunications device includes a synchronization bus and a controller coupled to the bus that generates a system clock signal according to a primary reference clock signal and communicates the system clock signal using the bus. The controller detects a loss of the primary reference clock signal and, in response, continues generating the system clock signal, determines acceptability of a secondary reference clock signal, switches from the primary reference clock signal to the secondary reference clock signal if the secondary reference clock signal is acceptable, and in response to the switch generates the system clock signal according to the secondary reference clock signal.
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