USB Class Definitions for Communication Devices
Version 1.1
v
January 19, 1999
Contents
1. Introduction...............................................................................................................................1
1.1 Scope..................................................................................................................................1
1.2 Purpose...............................................................................................................................1
1.3 Related Documents .............................................................................................................1
1.4 Terms and Abbreviations .....................................................................................................4
2. Management Overview..............................................................................................................7
3. Functional Characteristics........................................................................................................8
3.1 Device Organization.............................................................................................................8
3.1.1 Communication Device Management............................................................................8
3.2 Device Operation.................................................................................................................9
3.3 Interface Definitions .............................................................................................................9
3.3.1 Communication Class Interface.....................................................................................9
3.3.2 Data Class Interface...................................................................................................10
3.3.2.1 Protocol Data Wrapper........................................................................................................ 11
3.4 Endpoint Requirements...................................................................................................... 12
3.4.1 Communication Class Endpoint Requirements ............................................................12
3.4.2 Data Class Endpoint Requirements.............................................................................12
3.5 Device Models ...................................................................................................................12
3.6 USB POTS Models ............................................................................................................12
3.6.1 Direct Line Control Model ...........................................................................................13
3.6.1.1 DL Model........................................................................................................................... 13
3.6.1.2 Datapump Model ................................................................................................................ 14
3.6.2 Abstract Control Model ...............................................................................................15
3.6.2.1 Abstract Control Model Serial Emulation............................................................................. 16
3.6.3 USB Telephone Model................................................................................................17
3.6.3.1 Telephone Control Model.................................................................................................... 17
3.7 USB ISDN Models ............................................................................................................. 18
3.7.1 Multi-Channel Model...................................................................................................18
3.7.1.1 Topology............................................................................................................................ 20
3.7.2 USB CAPI Model........................................................................................................20
3.7.2.1 CAPI Control Model........................................................................................................... 21
3.8 USB Networking Models ....................................................................................................22
3.8.1 Common Data Plane Characteristics........................................................................... 22
3.8.1.1 Segment Delineation........................................................................................................... 23
3.8.1.2 Segment Size...................................................................................................................... 24
3.8.2 Ethernet Networking Control Model............................................................................. 24
3.8.3 ATM Networking Control Model ..................................................................................26
4. Class-Specific Codes for Communication Devices ................................................................28
4.1 Communication Device Class Code....................................................................................28
4.2 Communication Interface Class Code.................................................................................28
4.3 Communication Interface Class SubClass Codes................................................................28
4.4 Communication Interface Class Control Protocol Codes......................................................29
4.5 Data Interface Class Codes................................................................................................29
4.6 Data Interface Class SubClass Codes................................................................................29
4.7 Data Interface Class Protocol Codes ..................................................................................29
5. Descriptors..............................................................................................................................31
5.1 Standard USB Descriptor Definitions ..................................................................................31
5.1.1 Device Descriptor.......................................................................................................31
