ADTRAN T400 19 - switch

Model: 1150028L1

ADTRAN T400 19 - Switch - 0 / 12 - external

The T400 shelf provides a space-saving housing for multiple Type 400 circuit packs. The T400 shelf can support customer premises NT1 applications, central office U-Repeater Powering Module (U-RPM) applications or Total Reach ISDN Central Office Units (TRI-C). The shelf is effective for large ISDN installations that prefer housing equipment in a centralized location instead of on a desktop. This provides efficient management and maintenance of ISDN circuits. The T400 shelf houses up to 12 NT1s, U-RPMs or TRI-Cs and is available in two sizes. The T400-23 is a 23-inch shelf, and the T400-19 is a 19-inch shelf. The T400 shelf can be powered internally or externally depending on the application. If U-RPMs are used in a central office, then the shelf is powered externally by a -48 VDC bulk power source. Additionally, for customer premises applications, the shelf has provisions for using internal or external power supplies to power the NT1s and the terminal equipment. When using internal power, one Type 400 power supply powers the shelf. A second power supply can be used as a redundant supply and will engage as a backup if the first unit fails. Two fuses protect the T400 power supplies from short circuiting. An external alarm can be connected to the shelves as an alert that a T400 power supply is down. An external power supply (110 VAC to -48 VDC) or any -48 VDC bulk power source can be used instead of the internal T400 power supply to power the NT1s and terminal equipment. The T400 shelf connects to the network and customer equipment by three 50-pin micro-ribbon connectors. A five position terminal block is used to make connections to the external power supply and the alarm.

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