3.3. CT_DEVINFO: Channel/Timeslot Device Information Data Structure

Use the SCbus routing device information functions, such as dx_getctinfo( ) and dt_getctinfo( ), to obtain information about DM3 devices, which is returned in a CT_DEVINFO data structure. This information can be used to identify whether a logical device belongs to DM3 hardware. The following selected fields in the data structure return information related to DM3 devices:

Table 3. DM3 Device Information in Selected CT_DEVINFO Fields

Field	DM3 Data Values/Description
ct_prodid	Not applicable for a DM3 device (reserved for future use).
ct_devfamily	CT_DFDM3 for a DM3 device.
ct_devmode	CT_DMNETWORK for a DM3 network device or for a DM3 voice device in fixed routing. CT_DMRESOURCE for a DM3 voice device in flexible routing.
ct_busencoding	CT_BEULAW or CT_BEALAW for _-law or A-law coding, respectively.
ct_rfu	Returned by ms_getctinfo( ) (for DM3 MSI devices). Returns a character string containing the board and channel of the voice channel resource associated with the station interface. This data is returned in BxxCy format, where xx is the voice board and y is the voice channel. For example, dxxxB1C1 would be returned as B1C1. To subsequently use this information in a dx_open( ) function, you must add the dxxx prefix to the returned character string.

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