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Chapter 8
■
Ethernet Control Model (ECM) devices, including devices supporting the IEEE 802
family (for instance cable and ADSL modems, WiFi adaptors).
8
■
Asynchronous Transfer Mode (ATM) devices, including ADLS modems and other
devices connected to ATM networks (workstations, routers, LAN switches).
■
Wireless Mobile Communications (WMC) devices, including multi-function
communications handset devices used to manage voice and data communications.
■
Ethernet Emulation Model (EEM) devices which exchange Ethernet-framed data.
■
Network Control Model (NCM) devices, including high-speed network devices (High
Speed Packet Access modems, Line Terminal Equipment)
8-1 OVERVIEW
A CDC device is composed of several interfaces to implement a certain function, that is
communication capability. It is formed by the following interfaces:
■
Communications Class Interface (CCI)
■
Data Class Interface (DCI)
A CCI is responsible for the device management and optionally the call management. The
device management enables the general configuration and control of the device and the
notification of events to the host. The call management enables calls establishment and
termination. Call management might be multiplexed through a DCI. A CCI is mandatory for
all CDC devices. It identifies the CDC function by specifying the communication model
supported by the CDC device. The interface(s) following the CCI can be any defined USB
class interface, such as Audio or a vendor-specific interface. The vendor-specific interface is
represented specifically by a DCI.
A DCI is responsible for data transmission. The data transmitted and/or received do not follow
a specific format. Data could be raw data from a communication line, data following a
proprietary format, etc. All the DCIs following the CCI can be seen as subordinate interfaces.
116
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