6.4. User Configurable ISDN Parameters

When using DM3 boards, ISDN protocol parameters are configurable by editing a CONFIG file. The FCDGEN utility is then used to convert the CONFIG file to an FCD file which is then used when downloading the firmware to the board. See the configuration information for DM3 products provided with the system release software for more information about the parameters that can be configured.

When using Springware boards, the parameters listed in Table 55 may be configured by the user by modifying the ISDN parameter (.prm) file. The parameter values should be set in accordance with your protocol and carrier requirements. See the Release Documentation included with each protocol for details.

Table 55. Modifiable Protocol Parameters 

Parameter	Value (hex)	Description
000F	00* 01	Digital E-1 trunk framing format: 00 = G.703 framing without CRC4 (default) 01 = G.703 framing with CRC4 Must be set to carrier requirement. Note: For T-1 applications, this parameter must be commented out (not used).
0013	00* 01	Digital trunk protocol type: 00 = Standard T-1/E-1 (default) 01 = PRI ISDN Must be set to 01 for ISDN application.
0014	00* 01	Digital T-1 trunk framing format: 00 = D4 framing (default) 01 = ESF (Extended Super Frame) framing Note: ESF framing is only supported in SCbus mode. Note: For E-1 applications, this parameter must be commented out (not used).
0016	00* 01 02	Enable D channel flag: 00 = Undefined (default) 01 = Enable D channel 02 = Disable D channel Must be set to 01 for the board carrying the D channel and to 02 for all other boards in NFAS group or in a clear channel application.
0023	00* 01	Inverted D channel flag: 00 = D channel data is not inverted (default) 01 = D channel is inverted Note: Must be set to 01 for D channel inversion.
0024	00* 01 02 04 08 10 20 40 80	Feature flag: 00 = ISDN layer 2 access inactive (disabled) (default). When layer 2 access is required, set to 01. 01 = ISDN layer 2 access active (enabled) 02 = Enable double call feature 04 = Not used 08 = Enable overlap sending feature 10 = Enable host controlled release 20 = Not used 40 = Not used 80 = Not used
* = Parameter file default selection; see most probable parameter defaults below.

Each ISDN protocol parameter (.prm) file uses the most probable parameters for that protocol as the default setting. See Table 56 and Table 57 for a summary of the default parameter settings for each protocol.

Table 56. T-1 ISDN Protocol Parameter Defaults 

Parameter	4ESS, 5ESS	DMS/100, DMS/250	NTT (INS1500)
000F	----	----	----
0013	01	01	01
0014	Check with carrier.
0016	For a D channel board, set to 01; for an NFAS application; for a non D channel board, set to 02.
0023	When using D4 framing, D channel inversion is recommended, set to 01 (also check with carrier); otherwise, ignore.
0024	Select from list of features for parameter 0024 listed in Table 55.

Table 57. E-1 ISDN Protocol Parameter Defaults

Parameter	1TR6	CTR4	DASS2	DPNSS	VN3	TPH
000F	Check with carrier.
0013	01	01	01	01	01	01
0014	----	----	----	----	----	----
0016	01	01	01	01	01	01
0023	----	----	----	----	----	----
0024	Select from list of features for parameter 0024 listed in Table 55.

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