# Changing configuration parameter settings

When you run oamsys, the utility starts all boards according to the configuration parameters specified in their associated board keyword files.

To change a parameter:

- Use of modify one of the sample board keyword files corresponding to your country and board type. Specify the name of this new file in the File statement in oamsys.cfg and run oamsys again. Refer to the NMS OAM System User's Manual for information about the syntax of NMS OAM board keyword files.

- Specify parameter settings with oamcfg. Refer to the NMS OAM System User's Manual for information about oamcfg.

- Create a new board keyword file, either with additional keywords or with keywords whose values override earlier settings.

- Specify the settings using OAM service functions. Refer to the NMS OAM Service Developer's Reference Manual for more information.

You can oamsys to:

- Change which software module files are downloaded to the board at startup. Refer to Specifying configuration file locations for more information.

- Specify board switching.

- Configure CT bus clocking.

## .leo files

A .leo (loadable extensible object) file is a run module, a modular extension to the core file. The core file and the run modules make up the software that runs on the board's coprocessor.

The following .leo files are included with AG 2000C:

File | Description
--- | ---
svc.leo | DSP function manager
gtp.leo | Trunk protocol engine
voice.leo | Play and record manager