# Making switch connections for NMS ISDN

To enable an application access to ISDN channels, several switch connections must be made. In the board keyword file, if Clocking.HBus.ClockMode is set to StandAlone, these settings are automatically made when the board boots.

If Clocking.HBus.ClockMode is set to any other value, the application must set these values using the NMS Switching service or swish utility. The application must make the following connections:

- On each trunk, streams and timeslots carrying D channel information to and from the HDLC controller (if any) must be connected to streams and timeslots accessible by the ISDN protocol stack. These connections must be full duplex. They must be made before the ISDN protocol stack is initialized. (Initialization is described in Initializing ISDN protocol stack instances.)

- The streams and timeslots carrying voice information to and from the trunk must be connected to the streams and timeslots carrying voice information to and from the DSP resources. The connections must be full duplex.

The connections differ depending upon whether the NetworkInterface.T1E1.SignalingType keyword is set to PRI or RAW. Specifically, if NetworkInterface.T1E1.SignalingType=RAW, no connections are made between the HDLC controller and signaling streams. This setting is for trunks that are included in NFAS groups and do not have a D channel in operation. For more information about these keywords and about NFAS, see the NMS ISDN Installation Manual.

Connections are listed in MVIP-95 nomenclature unless otherwise specified.

Note: On CG boards, the framer signaling is hard wired to the HDLCs. Any attempt to switch framer signaling to the HDLCs will fail.

The following table shows the default connections. The exact settings depend upon the NetworkInterface.T1E1.SignalingType keyword setting.

Board | Setting | Default connections
--- | --- | ---
Four-trunk T1 board (for example, CG 6000C) | PRI | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..22 => 17:0..22, 16:0..22 => 1:0..22 Trunk 2: 4:0..22 => 17:24..46, 16:24..46 => 5:0..22 Trunk 3: 8:0..22 => 17:48..70, 16:48..70 => 9:0..22 Trunk 4: 12:0..22 => 17:72..94, 16:72..94 => 13:0..22 Full duplex, between HDLC controller and signaling streams (AG boards only): Trunk 1: 2:0 => 21:0, 20:0 => 3:0 Trunk 2: 6:0 => 23:0, 22:0 => 7:0 Trunk 3: 10:0 => 25:0, 24:0 => 11:0 Trunk 4: 14:0 => 27:0, 26:0 => 15:0
Four-trunk T1 board (for example, CG 6000C) | RAW | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..23 => 17:0..23, 16:0..23 => 1:0..23 Trunk 2: 4:0..23 => 17:24..47, 16:24..47 => 5:0..23 Trunk 3: 8:0..23 => 17:48..71, 16:48..71 => 9:0..23 Trunk 4: 12:0..23 => 17:72..95, 16:72..95 => 13:0..23
Four-trunk E1 board (for example, CG 6000C) | PRI | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..29 => 17:0..29, 16:0..29 => 1:0..29 Trunk 2: 4:0..29 => 17:30..59, 16:30..59 => 5:0..29 Trunk 3: 8:0..29 => 17:60..89, 16:60..89 => 9:0..29 Trunk 4: 12:0..29 => 17:90..119, 16:90..119 => 13:0..29 Full duplex, between HDLC controller and signaling streams (AG boards only): Trunk 1: 2:0 => 21:0, 20:0 => 3:0 Trunk 2: 6:0 => 23:0, 22:0 => 7:0 Trunk 3: 10:0 => 25:0, 24:0 => 11:0 Trunk 4: 14:0 => 27:0, 26:0 => 15:0
Four-trunk E1 board (for example, CG 6000C) | RAW | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..30 => 17:0..30, 16:0..30 => 1:0..30 Trunk 2: 4:0..30 => 17:31..61, 16:30..61 => 5:0..30 Trunk 3: 8:0..30 => 17:62..92, 16:60..92 => 9:0..30 Trunk 4: 12:0..30 => 17:93..123, 16:90..123 => 13:0..30 Generally, NetworkInterface.T1E1[x]. SignalingType is set to RAW only for trunks that are included in NFAS groups and do not have a D channel in operation. NFAS is not supported on E1 trunks.
Two-trunk T1 board (for example, CG 6000C) | PRI | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..22 => 17:0..22, 16:0..22 => 1:0..22 Trunk 2: 4:0..22 => 17:24..46, 16:24..46 => 5:0..22 Full duplex, between HDLC controller and signaling streams (AG boards only): Trunk 1: 2:0 => 21:0, 20:0 => 3:0 Trunk 2: 6:0 => 23:0, 22:0 => 7:0
Two-trunk T1 board (for example, CG 6000C) | RAW | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..23 => 17:0..23, 16:0..23 => 1:0..23 Trunk 2: 4:0..23 => 17:24..47, 16:24..47 => 5:0..23
Two-trunk E1 board (for example, CG 6000C) | PRI | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..29 => 17:0..29, 16:0..29 => 1:0..29 Trunk 2: 4:0..29 => 17:30..59, 16:30..59 => 5:0..29 Full duplex, between HDLC controller and signaling streams (AG boards only): Trunk 1: 2:0 => 21:0, 20:0 => 3:0 Trunk 2: 6:0 => 23:0, 22:0 => 7:0
Two-trunk E1 board (for example, CG 6000C) | RAW | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..30 => 17:0..30, 16:0..30 => 1:0..30 Trunk 2: 4:0..30 => 17:30..61, 16:30..61 => 5:0..30 Generally, NetworkInterface.T1E1[x]. SignalingType is set to RAW only for trunks that are included in NFAS groups and do not have a D channel in operation. NFAS is not supported on E1 trunks.
Four trunk BRI board | PRI | Full duplex, between trunk voice information and DSP resources: Trunk 1: 0:0..1 => 5:0..1, 4:0..1 => 1:0..1 Trunk 2: 0:2... 3 => 5:2..3, 4:2..3 => 1:2..3 Trunk 3: 0:4..5 => 5:4..5, 4:4..5 => 1:4..5 Trunk 4: 0:6..7 => 5:6..7, 4:6..7 => 1:6..7
Four trunk BRI board | RAW | None.