APPENDIX A
NT1 TYPE 400 CIRCUIT PACK
RACK INSTALLATION
The ADTRAN NT1 Type 400 Circuit Pack, Part No. 1212010, can be purchased as a separate unit for installation in a Type 400 NCTE rack. This configuration pro- vides a central location for the NT1 in a customer's wiring closet, and facilitates bat- tery backup. Refer to ADTRAN's Building a Battery Protected ISDN Phone System for a complete description of the centrally located battery
Figure A-1 shows the connector pin assignments of the ADTRAN NT1 Type 400 Circuit Pack. The Type 400 rack supplies -48V to the Circuit Pack. In addition, the Type 400 rack provides access to the necessary wire pairs for connection to the network and the customer's TE.
After ensuring that connections to the Type 400 rack are correct, and the circuit pack has been optioned properly, insert the circuit pack into the Type 400 rack by firmly pushing the circuit pack into one of the available slots. The circuit pack should slide in smoothly and snap into place.
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