Connecting to the network

Before connecting a TX 4000C board to the network, ensure that you have properly configured the trunks as either T1 or E1 trunks. For configuration information, refer to the Dialogic® NaturalAccess™ Signaling Software Configuration Manual.

Caution:

Dialogic Corporation obtains board-level approval certificates for supported countries. Some countries require that you obtain system-level approvals for boards connected to the public network. To learn what approvals you require, contact the appropriate regulatory authority in the target country.


Use a shielded 50-pin Telco cable to connect a TX 4000C board to a T1 network or to an E1 120 ohm trunk. Connect the Telco cable to a punchdown block. Failure to use a shielded cable may negate Class B approval.

To connect a TX 4000C board to a 75 ohm E1 trunk, configure the board as E1 120 ohm and connect a shielded 50-pin Telco cable to a punchdown block or SEP. Connect the punchdown block or SEP to a 75 ohm BNC signal entry panel or equivalent to convert the impedance from 120 to 75 ohm.

For information about the products available for connecting and terminating Dialogic boards, contact your Dialogic Services and Support representative.

The following illustration shows a TX 4000C board connecting to a punchdown block:

T1 network considerations

For typical T1 communications, each trunk interface connects to a channel service unit (CSU) that is connected to a T1 trunk line. The CSU provides a DSX-1 interface to the T1 line and also contains circuitry that enables the Central Office (CO) to perform diagnostic tests remotely. The following illustration shows the TX 4000C trunk interface with the CSU:

Note: Trunks do not synchronize until the board is booted with a valid T1 configuration.

You can purchase or lease the CSU from the telephone company or other vendor. The CSU must be compatible with DSX-1 specifications.

Warning:

Important safety notes for telephony connections:

Use a channel service unit (CSU) to isolate the cables attached to this product before the cables leave the building.


To avoid causing T1 service provider alarms, make sure that the board always sends a valid signal, either by looping back at the CSU or by connecting the CSU to a functioning TX 4000C board. The best way to provide a loopback is to unplug the cable from the TX board to the CSU. The modular connector on most CSUs loops back the transmit signal to the receive signal when nothing is plugged in.

E1 network considerations

TX 4000C boards have as many as eight CEPT E1 trunk interfaces. For typical E1 communications, each E1 interface connects directly to an E1 trunk, as shown in the following illustration:

Note: Trunks do not synchronize until the board is booted with a valid E1 configuration.