4.11.1. Device Overview

The following concepts are key to understanding Intel® Dialogic devices:

device

• A computer component controlled through a software device driver. An Intel® Dialogic resource board, such as a voice resource, fax resource, and conferencing resource, and network interface board contain one or more logical board devices. Each channel or time slot on the board is also considered a device.

device channel

• A data path that processes one incoming or outgoing call at a time (equivalent to the terminal equipment terminating a phone line). The first two numbers in the product naming scheme identify the number of device channels for a given product. For example, there are 24 voice device channels on a D/240JCT-T1 board, 30 on a D/300JCT-E1.

device name

• A literal reference to a device, used to gain access to the device via an xx_open( ) function, where "xx" is the prefix defining the device to be opened. The "xx" prefix is "dx" for voice device, "fx" for fax device, "ms" for modular station interface (MSI) device, and so on. For more information on device names, see Section 4.11.5, Constructing Device Names.

physical and virtual boards

• Intel® Dialogic API functions distinguish between physical boards and virtual boards. The device driver views a single physical voice board with more than four channels as multiple emulated D/4x boards. These emulated boards are called virtual boards. For example, a D/120JCT-LS with 12 channels of voice processing contains 3 virtual boards. A DM/V480A-2T1 board with 48 channels of voice processing and 2 T-1 trunk lines contains 12 virtual voice boards and 2 virtual network interface boards.

The Intel Dialogic System Software creates standard device and channel names for boards. These names are input as the namep parameter to, for example, the dx_open( ) and fx_open( ) functions, which return the device handles necessary for many essential API calls, such as dx_play( ) and dx_rec( ).

When assigning device names, the Intel Dialogic System Software first groups the devices into device types and then sorts the devices within each group. Each groups' sort order depends on what kind of boards are installed in your system. Each device is then named according to its device type (group) sort number.

You can verify the Springware device names assigned to the boards in your system as follows:

1. Go to \Program Files\Dialogic\Cfg. This is the default location for configuration files. You may have specified a different location when installing the Intel Dialogic System Software.
2. Examine the Voxcfg file against the device naming rules described in Section 4.11.5, Constructing Device Names. Do NOT modify this file.

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