Hi,

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:

RJ-45

DB-25 DCE

DB-25 DTE

Check out these links:

Cabling Guide for Console and AUX Ports

http://www.cisco.com/warp/public/701/14.html

Configuring Dialout using a Modem on the AUX Port

http://www.cisco.com/en/US/tech/tk801/tk36/technologies_configuration_example09186a0080094579.shtml

Configuring a Modem on the AUX Port for EXEC Dialin Connectivity

http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a0080094bbc.shtml

Connecting Routers Back-to-Back Through the AUX Ports

http://www.cisco.com/en/US/tech/tk801/tk36/technologies_configuration_example09186a0080093c7b.shtml

HTH, please do rate all helpful replies using the scrollbox on the right,

Mohammed Mahmoud.