6. R4 DTI API for DM3

6.1. DTI Network Interface API Function Restrictions

The Network Interface library (DTI library) contains functions for controlling the digital network interface (E-1 or T-1) to the PSTN (Public Switched Telephone Network). The DTI library includes functions for alarm handling, diagnostics, resource management, SCbus routing and others. See the Digital Network Interface Software Reference for detailed information about DTI functions.

R4 for DM3 does not support most DTI functions since the same functionality can be achieved using GlobalCall. However, R4 for DM3 does support the resource management and SCbus routing functions as shown in Table 13. List of DTI API Functions Fully Supported. R4 on DM3 now uses the DTI API for Layer 1 alarms. In previous versions of R4 on DM3, the GlobalCall API handled those alarms (see 6.2. Detecting Layer 1 Alarms). All other DTI functions are not supported.

NOTE:

If you execute a network interface library function that is not supported on DM3 boards, it produces an EDT_NOTIMP ("not implemented") error.

Table 13. List of DTI API Functions Fully Supported

Function Name	Notes
dt_close( )	Supported. Although dt_open( ) and dt_close( ) are supported on DM3 network interface devices, use of the network interface device handle is extremely limited because GlobalCall provides R4 on DM3 application call control rather than the DTI API. In general, use the gc_OpenEx( ), gc_GetNetworkH( ), and gc_Close( ) functions instead.
dt_getctinfo( )	Supported.
dt_getxmitslot( )	Supported.
dt_listen( )	Supported.
dt_open( )	Supported. See note for dt_close( ).
dt_setevtmsk( )	Limitations: Supports enabling layer 1 alarms.
dt_unlisten( )	Supported.
dt_xmitalrm( )	Supported.

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