Assessments - 3, GPA: 5
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Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment. Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines, and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas. Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or an electrician, as appropriate. The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all devices does not exceed 100. Table of Contents 1.0 GENERAL............................................................................... 1 1.01 Unit Overview ......................................................................... 1 1.02 Basic Rate Description ........................................................... 2 1.03 Passive Bus Description ......................................................... 2 1.04 Powering TEs from the NT1 ................................................... 2 1.05 Rear Panel..............................................................................2 2.0 INSTALLATION ...................................................................... 3 2.01 Setting the Option Switches.................................................... 3 2.02 Powering Up the NT1 Type 400 Standalone .......................... 4 2.03 Connecting the Terminal Equipment ...................................... 4 3.0 TROUBLESHOOTING............................................................ 5 4.0 MAINTENANCE...................................................................... 6 5.0 REMOTE TESTING................................................................6 6.0 REPAIR AND RETURN..........................................................6 7.0 SPECIFICATIONS..................................................................7 APPENDIX A NT1 TYPE 400 CIRCUIT PACK RACK INSTALLATION ................. 9 APPENDIX B S/T BUS CONFIGURATIONS........................................................11 61212016L1-1 NT1 T400 User Manual Table of Contents FIGURES Figure 1. NT1 Type 400 Standalone Rear Panel ............................ 2 Figure 2. NT1 Type 400 Switch Option Locations...........................3 Figure A-1.NT1 T400 Circuit Pack Connector Pin Assignments .... 10 Figure B-1.Short Passive Bus Configuration .................................. 11 Figure B-2.Extended Passive Bus Configuration ........................... 11 TABLES Table 1. NT1 Type 400 Front Panel Indicators...............................1 Table 2. NT1 Type 400 Switch settings.........................................3 Table 3. NT1 Pin Assignments.......................................................4 NT1 T400 User Manual 61212016L1-1 1.0 GENERAL 1.01 Unit Overview The ADTRAN NT1 Type 400 provides a basic rate interface between the customer’s ISDN Terminal Equipment (TE) and the ISDN Network. Two interfaces are provided for this purpose: connection to the ISDN network is made by the “U” interface and connection to the customer'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. 1212.016L1. • The NT1 Type 400 Circuit Pack, Part No. 1212.010. 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. LED Indicators Table 1 describes the status of the LEDs located on the front panel of the NT1 Type 400. There is a READY and ERROR indicator for each port of the NT1 Type 400. Table 1: NT1 Type 400 Front Panel Indicators LED Color Description READY Green S/T and U interfaces ready to place call ERROR Red S/T or U interface not ready POWER Green Unit has power If an ERROR indicator is illuminated, check the flash rate of the READY indicator to determine the source of the error. A faster 8 Hz flash rate (8 flashes per second) indicates a network problem. A slower 1 Hz rate (1 flash per second) indicates an S/T interface problem. 61212016L1-1 NT1 T400 User Manual . 1.02 Basic Rate Description ISDN Basic Rate Service consists of two “B” channels at 64 kbps and a single “D” channel at 16 kbps. Basic Rate Servic...