# NetworkInterface.T1E1[x].D_Channel

Specifies whether the trunk has a primary D channel with ISDN running on it.

#### Syntax

NetworkInterface.T1E1[x].D_Channel = setting

x = 0-(n-1) (0-based trunk number or range of trunk numbers where n equals the number of trunks on the board.)

#### Access

Read/Write

#### Type

String

#### Default

ISDN_NONE

#### Allowed values

ISDN | ISDN_NONE

#### Example

NetworkInterface.T1E1[0..3].D_Channel = ISDN

#### Details

If NetworkInterface.T1E1[x].D_Channel = ISDN for any of the trunks on a board, a configuration message is sent to the ISDN stack on that board to initialize that stack. You must initialize the ISDN stack for any trunk that has a D channel. You must also enable the HDLC controller for that trunk by setting the NetworkInterface.T1E1[x].SignalingType keyword to the value PRI.

In the case of an NFAS group with a backup D channel, specify this keyword for the primary D channel only. The backup D channel is specified using the NetworkInterface.T1E1[x].ISDN.D_Channel_Backup_Trunk keyword.

NetworkInterface.T1E1[x].D_Channel is required in any configuration where NFAS is used. For information about NFAS groups, refer to the Dialogic® NaturalAccess™ ISDN API Installation Manual.

#### See also

NetworkInterface.T1E1[x].CRCMFMode, NetworkInterface.T1E1[x].FrameType, NetworkInterface.T1E1[x].Impedance, NetworkInterface.T1E1[x].Length, NetworkInterface.T1E1[x].LineCode, NetworkInterface.T1E1[x].Type