Chapter 3: Connecting to the Line

Connecting Directly in a DSX1 Configuration

You can connect the board directly to the T1/PRI line without using a CSU if the distance to your carrier is less than 655 feet or 200 meters. The line will be in a DSX1 configuration, as shown in the following illustration:

Less than 655 feet (200m)

WAN Adapter

Telco

Figure 3-1. Direct DSX1 Connection to the Line

Connecting Directly in a DS1 Configuration

If the distance to your carrier is up to 6200 feet (1.8 kilometers), you can connect directly to the T1/PRI line with the board’s internal CSU activated. The line will be in a DS1 configuration, as shown in the following illustration:

Up to 6200 feet (1.8 km)

WAN Adapter

Telco

Figure 3-2. Direct DS1 Connection with Internal CSU

Connecting Through an External CSU to the Line

If you do not use the board’s internal CSU to connect to the T1/PRI line in a DS1 configuration, you can connect the board to an external CSU that connects to the metallic T1/PR1 interface. (You might want to use this method if the distance to

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