# Using isdndemo

Perform the following steps to use isdndemo:

Step | Action
1 | Set up the boards in a configuration that allows one trunk to talk with another. For example, install two boards and connect a cable between their trunk connectors. Do not link the boards together over the CT bus. For NFAS configurations, you can also install a single CG 6000C and connect a cable between two trunk connectors.
2 | Start oamsys to configure and boot the boards.
3 | Use isdndemo by either invoking an instance of the demonstration program with two active D channels or by invoking two separate instance of the demonstration program to call each other. To invoke one instance of the demonstration program with two active D channels (using the -D option), enter: isdndemo -b 0 -n -p 20 -D -b 1 -o 10 If you specify a protocol variant for one D channel, the other uses the same variant unless otherwise specified. All other parameters (such as board, NT/TE, and call parameters) are unique for each D channel and must be configured separately. To invoke two separate instances of the demonstration program to call each other, invoke one instance for each trunk. Set up one to place calls, and the other to receive calls. Make sure to include the -n (lowercase) option to configure one instance as the NT side. For example: isdndemo -b 0 -n -p 20 isdndemo -b 1 -p 20 -o 10