Approved Class Specifications are those that have officially reached Version 1.0 status and are usable to design products. Each document describes one or more classes, identified by a Class Code. Devices and interfaces that implement a class must use this Class Code (for example, in the bInterfaceClassfield). Each Approved Class Specification defines the appropriate values for SubClass and Protocol for the class(es) it defines.

If you have questions regarding any of these documents please contact the DWG chair (dwg-wg-chair@usb.org) and your questions will be channeled to the appropriate group.

Audio Class

Audio Device Class Spec for Basic Audio Devices and Adopters Agreement (.zip format, size 1.33MB)
Audio Device Document 1.0
Audio Data Formats 1.0
Audio Terminal Types 1.0
USB MIDI Devices 1.0
Audio Devices Rev. 2.0 Spec and Adopters Agreement (.zip format, size 1.28 MB) 

Audio/Video Device Class

Audio/Video Device Class v1.0 Spec and Adopters Agreement (.zip format, size 11.5 MB)
AVSchema Documentation
AVSchema Files:  http://avschemas.usb.org/v1/avschema.xsd and http://avschemas.usb.org/v1/avtypes.xsd

AVDD Creator User Manual (.pdf format, 472 KB)
AVDD Creator Installer (.zip format, 126 MB)
USB Device Class Definition for Audio/Video Devices Basic Device Profile (BDP) (.pdf format, 1.20 MB)

Battery Charging

Battery Charging v1.2 Spec and Adopters Agreement (.zip format, size 1.30 MB)
Battery Charging v1.1 Spec and Adopters Agreement (.zip format, size 292 KB)

USB Battery Charging 1.2 Compliance Plan (Revision 1.0)

Cable and Connector

USB 3.0 Connectors and Cable Assemblies Document Rev. 1.02
Cable and Connector Class 2.0 
Series 'A' Plug form factor Guideline 1.0
USB Connector for Mezzanine Applications Guidelines Rev. 1.0
Micro-USB Cables and Connectors v1.01 Spec and Adopters Agreement
USB Thin Card v1.0 and Adopters Agreement

Common Class (CCS)

Common Class Base Specification 1.0

Communications Device Class

Class definitions for Communication Devices 1.2 (.zip file format, size 3.42 MB)
the components of CDC 1.1 have been reorganized as five separate documents and associated errata:
- ATM120.pdf -- CDC Subclass for Asynchronous Transfer Mode Devices
- CDC120-20101103-track.pdf - CDC Subclass for Communications Devices
    - CDC120-Errata1.pdf ECM120.pdf - CDC Subclass for Ethernet Control Model Devices
- ISDN120.pdf -- CDC Subclass for ISDN Devices
- PSTN120.pdf -- CDC Subclass for PSTN devices
- WMC110-20101103-track.pdf - CDC Subclass for Wireless Mobile Communication Devices 1.1
- WMC110-Errata1.pdf and CDC v1.2 WMC v1.1 Errata 1 Adopters Agreement

Errata updates for CDC v1.2 and WMC v1.1 as of DEC-2012 (.zip file format, size 2.5 MB)
- CDC Subclass for Communications Devices
    2012-08-02-CDC120_errata.pdf
    2012-08-02-CDCErrata-1.pdf
- CDC Subclass for Wireless Mobile Communications Devices 1.1
    2012-07-31-WMC110_errata.pdf
    2012-07-31-WMCErrata-1.pdf
- CDC v1.2 WMC v1.1 Errata 1 Adopters Agreement

CDC Subclass Specification for Ethernet Emulation Model Devices 1.0

Network Control Model Devices Specification v1.0 and errata and Adopters Agreement (.zip format, size 948 KB)

Mobile Broadband Interface Model v1.0 Errata -1 and Adopters Agreement (.zip format, size 3.62MB)

MBIM Compliance Testing v1.0 (pdf 1.23MB)

Content Security

Device Class Definition for Content Security Devices 2.0
Content Security Method 1 - Basic Authentication Protocol 1.0
Content Security Method 2 - USB Digital Transmission Content Protection Implementation 1.0
Content Security Method 5 - High-bandwidth Digital Content Protection 2.1 (HDCP 2.1) Implementation

Device Firmware Upgrade Group

Device Firmware Upgrade 1.1 (new version 31-Aug-2004)

HID Class

HID Information

Imaging Class

Still Image Capture Device Definition 1.0 and Errata as of 16-Mar-2007 (.zip format, size 200 KB)

IrDA

IrDA Bridge Device Definition 1.0

Mass Storage

Mass Storage Class Specification Overview 1.4
Mass Storage Bulk Only 1.0
Mass Storage Control/Bulk/Interrupt (CBI) Specification 1.1  
Mass Storage UFI Command Specification 1.0
Mass Storage Bootability Specification 1.0
Lockable Mass Storage Specification 1.0 and Adopters Agreement (.zip format, size 288 KB)
  - Lockable Mass Storage IP Disclosure
USB Attached SCSI Protocol (UASP) v1.0 and Adopters Agreement (.zip format, size 204 KB)
USB Mass Storage Class Specification for UASP Bootability v1.0 and Adopters Agreement (.zip format, size 503 KB)

Media Agnostic USB

Media Transfer Protocol

Media Transfer Protocol v.1.1 Spec and MTP v.1.1 Adopters Agreement (.zip format, size 1.98MB)

Monitor

Monitor Device Document 1.0

OpenUSBDI

OpenUSBDI Specification 1.0

Personal Healthcare

Personal Healthcare Rev. 1.0, Errata for USB Personal Health Care Device Class and Personal Healthcare Adopters Agreement (.zip format, size 386 KB)

Physical Interface Devices

Device Class Definition for PID 1.0

Power

Power Device Class Document 1.0

Printer Class

Printer Device Class Document 1.1
IPP Protocol 1.0 and Adopters Agreement (.zip, 1.32 MB)

Smart Card Class