4.6. Configuring Digital Network Interface Parameters (Springware Boards)

The digital network interface (DNI) parameter file is an ASCII text file used by the Intel Dialogic System Software to initialize the firmware configuration for the front end of digital network interface Springware boards. The DNI parameter file is named Spandti.prm and is installed in the Data subdirectory of the Intel Dialogic home directory (normally C:\Program Files\Dialogic\Data).

If the default settings in Spandti.prm are not appropriate for your application, you can modify this file or create your own version of this file. In either case, you must enter the name of the file in DCM using the ParameterFile parameter, which appears on the Misc property sheet for Springware boards.

Table 2 shows the parameter ID, name, and default settings for DNI parameters. The comments in the Spandti.prm file provide further details about the parameters. Comments in the parameter file are preceded by a semicolon (;) in the first column of a line. Keep a record of the parameter settings that you change. All values are in hexadecimal.

In order for the modified DNI parameters to take effect, specify the name of the file that contains them with the ParameterFile parameter in DCM.

Table 2. Digital Network Interface Configuration Parameters 

ID	Parameter Name	Default Setting
0005	Receive Wink Definition	T-1: Detect wink with positive polarity on A bitE-1: Detect wink with negative polarity on A bit
0006	Transmit National and International Bits	E-1 only: All national and international bits set to 1
0007	Transmit Extra Bits	E-1 only: All extra bits set to 1
0008	Initial Signaling Insertion Pattern	T-1: A and B bits = 0E-1: A, B, and D bits = 1, C bit = 0 (blocking)
0009	Signaling Mode	Insertion mode
000A	Idle Mode	Do not transmit idle
000B	Transmit Idle Pattern	T-1: 7FhE-1: 54h
000C	Transmit Wink Definition	T-1: A bit toggles OFF to ON to OFF, B bit stays OFFE-1: A bit toggles ON to OFF to ON, B and C bits stay OFF, D bit stays ON
000D	Transmit Pulse Digit Make/Break State Definition	T-1: A bit pulses ON to OFF to ON, B bit stays OFFE-1: A bit pulses OFF to ON to OFF, B and C bits stay OFF, D bit stays ON
000E	Number of Pulses Per Digit	0 represented by 10 pulses
000F	CRC Enable Switch	E-1 only: Turn CRC off
0011	Receive Pulse Digit Definition	T-1: Detect digit with negative polarity on A bitE-1: Detect digit with positive polarity on A bit
0012	Line Length	0 to 110 feet
0013	CCTS16 (Clear Channel Time Slot 16)	E-1 only: E-1 signaling on time slot 16 (CCTS16 not enabled)
0020	Zero Code Suppression Mode	No zero code suppression

The Spandti.prm file can also be modified to configure T-1 span cards, such as the D/240SC-T1 running in robbed bit mode, to run ESF.

Note: There is no externalization of the error checking or network diagnostic capabilities of the ESF format.

To operate a T-1 span card in robbed bit ESF mode, add the following lines to the Spandti.prm file:

0014 01   ;ESF framing
0020 01   ;B8ZS 

Parameter 0014 sets the ESF framing; parameter 0020 sets the T-1 line for B8ZS.

T-1 span card revision numbers less than the following board and component level part numbers do not support ESF:

SpanCard Board	Part Numbers
D/240SC-T1	99-0392-009, 96-0064-008
D/240SC-2T1	99-2111-xxx (xxx=any suffix)
D/480SC-2T1	99-2028-xxx (xxx=any suffix)
DTI/240SC	99-0944-001, 96-0292-001
DTI/241SC	99-0947-004, 96-0295-003
DTI/480SC	99-2112-004, 96-0324-004
DTI/481SC	99-2420-003, 96-0455-003

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