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What is Clock Rate and Why is it Set

Clock rate is set or provided to fix the speed at which the data is to be received.
DCEs and DTEs are used in WAN connections. The communication via a WAN connection is maintained by providing a clock rate that is acceptable to both the sending and the receiving device.
For example, if a device connected via a WAN link is sending its signal at 1.544 Mbps, each receiving device must use a clock, sending out a sample signal every 1/1,544,000th of a second. The timing in this case is extremely short. The devices must be able to synchronize to the signal that is sent and received very quickly.
By assigning a clock rate to the router, the timing is set. This allows a router to adjust the speed of its communication operations, thereby synchronizing with the devices connected to it.
Clock rate is set on Router’s Serial Interface, if the router is running as a DCE (Data Communication Equipment). Generally clock rate is provided by teleco or Internet Service Provider through CSU/DSU in this case the router is said to be as DTE (Data Terminal Equipment) Device.Command to set Clock rate on Cisco Router
Router(config-if)#clock rate 1000000

Note:- New ISR Routers adjust Clock rate automatically by detecting DCE connections and set clock rate to 2000000 Router(config-if)#clock rate 1000000
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