dt_getxmitslot( )

Description | Cautions | Example | Errors | See also

Name:	int dt_getxmitslot (devh, sc_tsinfop)
Inputs:	int devh	digital network interface device handle
	SC_TSINFO *sc_tsinfop	pointer to SCbus time slot information structure
Returns:	0 on success
	-1 on error
Includes:	srllib.h
	dtilib.h
Category:	SCbus Routing
Mode:	Synchronous

Description

The dt_getxmitslot( ) function provides SCbus time slot number of the digital transmit channel. The SCbus time slot information is contained in a SC_TSINFO structure that also includes the number of the SCbus time slot connected to the digital network interface device transmit channel (T-1/E-1time slot).

NOTE:

SCbus convenience function nr_scroute( ) includes dt_getxmitslot( ) functionality. See the SCbus Routing Guide for more information on convenience functions.

Parameter	Description
devh:	Specifies a digital interface time slot device handle returned by a call to dt_open( ).
sc_tsinfop:	Points to the device information structure SC_TSINFO.

The SC_TSINFO structure is declared as follows:

     typedef struct {  
          unsigned long   sc_numts;  
          long           *sc_tsarrayp;  
     } SC_TSINFO;

The sc_numts field of the SC_TSINFO structure must be initialized with the number of SCbus time slots requested (1 for a digital network interface device time slot). The sc_tsarrayp member of the SC_TSINFO structure must be initialized with a pointer to a valid array of longs. Upon return from the function, the first element of the array will contain the number (between 0 and 1023) of the SCbus time slot on which the digital network interface device transmits.

A D/240SC-T1 or D/300SC-E1 digital network interface device can transmit on only one SCbus time slot at a time.

Cautions

This function will fail when:

• An invalid digital channel (T-1/E-1 time slot/device handle) is specified.
• A PEB time slot is requested.

Example

#include <windows.h>  
#include <srllib.h>  
#include <dtilib.h>  
#include <errno.h>
  
main( )  
{  
   int devh;                           /* Time slot device handle */  
   SC_TSINFO  sc_tsinfo;               /* Time slot information structure */  
   long scts;                          /* SCbus time slot */  
   /* Open board 1 time slot 1 for digital interface device */  
   if ((devh = dt_open("dtiB1T1", 0)) == -1) {  
      printf("Cannot open time slot dtiB1T1.  errno = %d", errno);  
     exit(1);  
   }  
   /* Fill in the SCbus time slot information */  
   sc_tsinfo.sc_numts = 1;  
   sc_tsinfo.sc_tsarrayp = &scts;  
   /* Get SCbus time slot connected to transmit of time slot (digital channel) 1 on   
      board 1 */  
   if (dt_getxmitslot(devh, &sc_tsinfo) == -1) {  
      printf("Error message = %s", ATDV_ERRMSGP(devh));  
     exit(1);  
   }  
   printf("%s is transmitting on SCbus time slot %d", ATDV_NAMEP(devh), scts);  
   .  
   .  
   .

Errors

If the function returns -1, use the SRL Standard Attribute function ATDV_LASTERR( ) to obtain the error code or use ATDV_ERRMSGP( ) to obtain a descriptive error message. The error codes returned by ATDV_LASTERR( ) are:

Equate	Returned When
EDT_BADBRDERR	Board missing or defective
EDT_BADCMDERR	Invalid command parameter to driver
EDT_FWERR	Firmware returned an error
EDT_INVTS	Invalid time slot device handle
EDT_INVMSG	Invalid message
EDT_SH_BADLCLTS	Invalid local time slot number
EDT_SH_BADINDX	Invalid Switch Handler library index number
EDT_SH_BADMODE	Invalid Switch Handler bus configuration
EDT_SH_BADTYPE	Invalid local time slot type
EDT_SH_LCLDSCNCT	Local time slot is already disconnected from SCbus
EDT_SH_LIBBSY	Switch Handler library busy
EDT_SH_LIBNOTINIT	Switch Handler library is uninitialized
EDT_SH_MISSING	Switch Handler is not present
EDT_SH_NOCLK	Switch Handler clock fallback failed
EDT_SYSTEM	Windows system error
EDT_TMOERR	Timed out waiting for reply from firmware

See also

• ag_listen( )
• fx_listen( )
• dx_listen( )
• ms_listen( )

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