Mitel 50001271 SX-200 / SX-2000 / 3300 ICP telephone system PBX Card / Module

The Mitel 50001271 is a Mitel 3300 Universal Network Service Unit (NSU), a T1/E1 digital trunk interface unit that connects to a 3300 ICP controller by fibre-optic cable and can be chained with a second NSU for additional digital trunk capacity. It supports T1 CAS/CCS variants (including Primary Rate ISDN) and E1 variants (including Euro-ISDN and QSIG). These Mitel PBX generations are still widely deployed across small, medium and enterprise sites, and stock like this supports ongoing maintenance, redundancy and capacity-expansion work on systems already in the field. Confirm the exact shelf, slot and revision this unit is replacing before ordering, since Mitel part numbers were revised across the product’s production run. Tech-Star (UK-based, shipped worldwide) stocks Mitel components to support ongoing PBX maintenance projects.