Connecting to the network

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

Caution:

Dialogic 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 RJ-45 cable to connect a TX 4000 board to a T1 network or to an E1-120 ohm network. Complete the following steps to connect a TX 4000 board to the network:

Step

Action

1

If connecting Trunk 1 or Trunk 2, connect a shielded RJ-45 cable directly to the board.

If connecting Trunk 3 or Trunk 4, use dual T1/E1 120 ohm trunk adapter cables to connect to the board. Each trunk adapter cable divides the 8-pin modular jack on the end bracket into two RJ-48C connectors. If you are connecting both jacks, use two cables, otherwise, just use one.

Note: TX 4000 boards are configured as T1/E1 120 ohm boards. To connect a TX 4000 board as an E1 75 ohm board, use a balun transformer to convert the impedance from 120 ohm to 75 ohm. No other configuration changes are required. For more information, contact a Dialogic Services and Support representative.

2

Connect shielded RJ-45 cables directly to the trunk connector on the board or to the dual T1/E1 trunk adapter cable.

Caution:

Failure to use a shielded cable may negate your approval.



The following illustration shows the cabling required to connect all four trunks on the TX 4000 board:

 

For more information, refer to dual T1/E1 120 ohm adapter cable.

E1 network considerations

TX 4000 boards can support up to four 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.

T1 network considerations

For typical T1 communications, each trunk interface connects to a channel service unit (CSU), which 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 4000 trunk interface with 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.

Warning:

Important safety notes for telephony connections:

Use a channel service unit (CSU) to isolate the cables that are 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 4000 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.