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The Communication Class interface is described by a USB interface descriptor, three class-specific descriptors, and an endpoint descriptor for the notification endpoint. The notification endpoint descriptor is a standard USB Interrupt-type IN endpoint descriptor whose wMaxPacketSize field is 8 bytes. The following table defines the prominent fields of the Communication Class interface descriptor.
| Offset (bytes) | Field | Size (bytes) | Value | Description |
|---|---|---|---|---|
5 |
bInterfaceClass |
1 |
02h |
Communication Interface Class code. |
6 |
bInterfaceSubClass |
1 |
02h |
Communication Interface Class SubClass code for Abstract Control Model. |
7 |
bInterfaceProtocol |
1 |
FFh |
Communication Interface Class Protocol code for vendor specific protocol. |