On my local side, I have Cisco 3640 with one PRI port, 30 mica modems configured. On the remote side, there is AS5300 device but the PRI interfaces are used for some other purposes. Just to manage that device from my central office, I tried to connect 3640 with the remote side over the AUX port of AS5300.
On AS5300, I have created Async interfaces and configured necassary (hopefully) items under the aux 0 interface. I did not use dialer interface commands. Modem call was initiated by central 3640 router. However, I was not succeeded in connection. Remote AS5300 successfully identifies the connected modem but there is nothing about connectivity. "Line is up, but line protocol is down" is the answer of "show int ser x/y" command on 3640.
Am I doing right things, or should I use dialer interfaces? What is the proper way of doing such a connection?
Since you don't share what you have configured, there is no way to tell what is keeping your configuration from working properly. While the AS5300 could be considered a unique beast and I have no personal experience with it, I have yet to run into an AUX port on a Cisco router which did not support dial backup. If you want a "second opinion" there is a white paper "Using the AUX Port on Cisco Routers for IP/IPX Router to Router Communications" on my web site which walks you through a working AUX to AUX routing example.
FWIW: The most common cause of problems is forgeting the "default routing" statement and using the wrong async interface number (for example, AUX0 is Async1 on a 25xx and Async65 on a 26xx. Make sure you use the right value for the 5300.
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