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router> enable

router# configure terminal

router(config) interface serial (interface number)

router(config-if) no shutdown

router(config-if) end

router#

substitute (interface number) for the actual int number.. eg serial 0/1

you can find the number of the interface by using show interfaces from privileged mode

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Q: Cisco router 2801 serial port is manually down how you can enable this port?
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