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# 2.5.3 Configuring the Library

The application designer must specify the following configuration parameters while using the CDC Function Driver. The configuration macros that implement these parameters must be located in the `system_config.h` file in the application project and a compiler include path (to point to the folder that contains this file) should be specified.

## Macros

Name | Description
USB_DEVICE_CDC_INSTANCES_NUMBER | Specifies the number of CDC instances.
USB_DEVICE_CDC_QUEUE_DEPTH_COMBINED | Specifies the combined queue size of all CDC instances.
Configuration on MCC | This section describes the symbols available in the MCC that can be configured.