Could you tell me, What is the AUX port and advantage for your this port?
I had some document but not clear.
AUX port is usually used to get dial-in access to the router, and it can also support SLIP and PPP and dial-on-demand async network access, the Aux port can be in one of those types:
Check out these links:
Cabling Guide for Console and AUX Ports
Configuring Dialout using a Modem on the AUX Port
Configuring a Modem on the AUX Port for EXEC Dialin Connectivity
Connecting Routers Back-to-Back Through the AUX Ports
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i think , the port which you can remotely login though telephone line.