North America T1/PRI Line

If the distance is longer (up to 6200 feet or 1800 meters), you need to connect the adapter in a DS1 configuration. In this configuration, a Channel Service Unit (CSU) must translate the short haul DSX1 interface in order to support the longer distance.

The iSPAN-PRI adapter optionally supports an internal CSU. In this case, you can connect the adapter directly to the T1/PRI line, also in a DS1 configuration. If your adapter does not include this option (and if the distance is too long), you will need to connect the adapter to an external CSU, which itself will be connected to the metallic T1/PR1 interface.

Connecting directly to the line without a CSU

You can connect the iSPAN-PRI directly to the line without any internal or external CSU if the distance to your carrier is short enough (less than 655 feet or 200 meters). The line will be in a DSX1 configuration (short haul). See Figure 3-1.

Less than 655 feet (200m)

WAN Adapter

Telco

Figure 3-1. Adapter connected directly to the Telco

Direct connection is subject to constraints imposed by FCC rules and by your partner carrier. For more information about these constraints, and to find out if you can connect directly to the interface, contact your carrier.

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Interphase Corporation