Smart serial connector i.e. V.35 connection speed is maximum 2.04 mbps equal to one E1 connection.
But i have not seen smart serial connector to any Cisco switch.It is found in router.
May be i am wrong.Please let me know if available in switches too.
The WIC-2T provides two serial ports using the Smart Serial connector.
Asynchronous support with a maximum speed (per port) of 115.2 Kbps, minimum 600 bps. If you need to run at speeds lower than 600 bps, use the AUX port instead.
Synchronous support with a maximum speed of 8 Mbps per port.
Sorry Nilesh, you're right it's in router, and i wanted to write router but i wrote switch it's my bad, sorry again for the confusion. now i've made correction.
Thanks for the information both of your guys, your information is really helpfull for me i really appreciate, thanks again.