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 4-3for the default settings).

SW2 sets the bit-error rate (BER) alarm threshold (see Table 4-4for 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 4-5for the default settings).

SW5 sets signal processing parameters according to the services required by the customer and provided by the telephone company (see Table 4-6for the default settings).

SW6 sets signal processing parameters according to the services required by the customer and provided by the telephone company (see Table 4-7for 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 isOFF or OPEN. The “Down” position is ON or CLOSED. To effect option changes, you must power down the CSU and then power up.

4-18Installing the Channel Service Unit

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AT&T Release 2.0 manual Setting the CSU DIP Switches, Default Switch Settings