2 routers can be connected using serial interfaces.
After set them up to see the encapsulations
Type
sh interfaces serial 1/0
You will probably see HDLC(Layer 2 protocol runs in place of ethernet,stands for high level data link control,it’s very simple to use,plug the cable in and routers serially connected will run HDLC,no configuration necessary).
To change it to ppp(point to point protocol)
From global config mode
Type
int serial 1/0
encapsulation ppp
exit
you have to do it both routers to up the connection
In a serial connection one side acts as a DCE another side as the DTE
To see it in a router
From global config mode
Type
sh controllers serial 1/0
In DCE side you will see the clockrate applied.
To set the clock rate manually
From global config mode
int serial 1/0
clock rate 64000
exit
Courtesy to Cisco Guru Jeremy Cioara
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