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Connecting the Control Unit to the Network Interface
Step 1: Setting the CSU DIP Switches
Set the CSU DIP switches as indicated on Form 3b, Incoming Trunks—DS1
Connectivity (100D Module).
The seven 8-position DIP switches on the rear panel of the CSU are set for
operating features and diagnostic tests:
■ SW1 sets the CSU address, which must be confirmed with the local
telephone company (see Table 4-3 for the default settings).
■ SW2 sets the bit-error rate (BER) alarm threshold (see Table 4-4 for the
default settings).
SW3 is not used.
■ SW4 sets the Errored Seconds threshold. Positions 7 and 8 can be
changed to match diagnostic equipment (see Table 4-5 for the default
settings).
■ SW5 sets signal processing parameters according to the services
required by the customer and provided by the telephone company
(see Table 4-6 for the default settings).
■ SW6 sets signal processing parameters according to the services
required by the customer and provided by the telephone company
(see Table 4-7 for the default settings).
■ SW7 sets the distance from the 100D module to the CSU (see Table 4-
8 for the default settings).
NOTE:
Setting SW7 or administering line compensation for the 100D
module can provide for cable distances up to 655 ft (200 m). If the
SW7 is set and the 100D module is administered, the maximum
cable distance between the100D module and the CSU can be up
to 1310 ft (399 m).
Default Switch Settings
In the following tables, the “up” position is OFF or OPEN. The “Down” position
is ON or CLOSED. To effect option changes, you must power down the CSU
and then power up.
4-18
Installing the Channel Service Unit