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Chapter 1
UNIT OVERVIEW
The ADTRAN NT1 Type 400 provides a basic rate interface between
the customer's ISDN Terminal Equipment (TE) and the ISDN Net-
work. Two interfaces are provided for this purpose: connection to the
ISDN network is made by the "U" interface and connection to the cus-
tomer's ISDN TE is made by the S/T interface.
The NT1 Type 400 is available in two configurations:
•
The NT1 Type 400 Standalone with an internal power supply, Part
No. 1212016L1.
•
The NT1 Type 400 Circuit Pack, Part No. 1212010.
The ADTRAN NT1 Type 400 Standalone consists of two parts, a metal
housing containing the power supply, connectors, and the NT1 Type
400 Circuit Pack. The Circuit Pack can be removed from the housing
by removing the plastic front panel and sliding the unit out of the
housing. This allows access to the option switches which may be reset
by the customer. The NT1 Type 400 Circuit Pack can also be purchased
as a separate unit and mounted in a Type 400 NCTE rack, as indicated
in Appendix A, NT1 Type 400 Circuit Pack on page A-1.
LED Indicators
Table 1-1 on page 1-2 describes the status of the LEDs located on the
front panel of the NT1 Type 400. There are a READY and an ERROR
indicator for each port of the NT1 Type 400.
61212016L1-20
About the NT1 Type 400
Nt1 T400 User Manual
1-1
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