AT&T Release 2.0 manual Installing the Channel Service Unit, ESF T1 CSU

Connecting the Control Unit to the Network Interface

Installing the Channel Service Unit

The channel service unit (CSU) provides the interface between the 100D module and the DS1 facilities.

NOTE:

Before the CSU can be installed, the local telephone company must be contacted for information such as services available, equipment options, and 48-VDC power on the trunk.

Two models are available:

■ESF T1 CSU

■551 T1 CSU

For any information on these CSUs that this chapter does not cover, see the user guide for your CSU. It is also recommended that you refer to the CSU documentation as you perform the procedures described in this section.

ESF T1 CSU

The ESF T1 CSU can connect to the DS1 network by using the D4 or extended superframe format (ESF). Also, it is the only CSU to provide the B8ZS line coding needed to transmit a 64-kbps clear channel.

Installing the ESF T1 CSU involves the following:

1.Setting the CSU DIP switches

2.Mounting the CSU in a relay rack or on a shelf as a stand-alone unit

3.Connecting the CSU to the 100D module and the network interface

4.Plugging the CSU into a 117-VAC outlet

Installing the Channel Service Unit 4-17