Channel Service Unit - AT&T MERLIN LEGEND Installation & Maintenance Manual

Installation

Channel Service Unit

The channel service unit (CSU) provides the interface between
the 100D module and the DS1 facilities. Two models are
available: the ESF T1 CSU and the 551 T1 L1 CSU.
ESF T1 CSU
The ESF T1 CSU can connect to the DS1 network by using the
D4 or extended superframe format (hence the ESF). Also, it is the
only CSU to provide the B8ZS line coding needed to transmit a
64-kbps clear channel.
Mount the ESF T1 CSU in a relay rack or on a shelf as a stand-
alone unit. Plug the CSU into a 117-VAC outlet.
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 line.
Also, a completed "Request for 1.544 Mbps End Section
Characteristics" form must be submitted to the telephone
company.
To install the ESF T1 CSU, set the switch options, mount the CSU
(as needed), and connect the wires from the 100D module and
the DS1 network. Follow the procedures below to install an
ESF T1 CSU.
Set the DIP Switches on the Rear Panel
The seven 8-position dual in-line package (DIP) switches on the
rear panel are set for operating features and for diagnostic tests:
SW1 sets the CSU address, which must be confirmed with the
local telephone company (see Table 3-1).
SW2 sets the bit-error rate (BER) alarm threshold (see
Table 3-2).
Channel Service Unit 3-19