Nortel NT6X21BC (telecommunications transmission and networking portfolio) Telecom System Card / Module

The Nortel NT6X21BC is a P-Phone Line Card, Processor Interface Card (PIC) Line Type C, in its UK variant, for the Nortel DMS-100 central-office digital switching platform. It provides the analogue subscriber-line interface between the exchange’s peripheral module and individual customer phone lines, converting and supervising the loop for onward digital switching, and the UK-specific release matches British line-signalling and ringing conventions rather than the North American default. DMS-100 exchanges of this generation remain in service in a number of established telecoms networks, and genuine spares such as this one are a routine requirement for maintaining full line capacity, restoring redundancy after a card failure, or expanding an existing installation. Tech-Star (UK-based, shipped worldwide) stocks Nortel DMS-100 line cards to support ongoing exchange maintenance. Please contact our sales team to confirm exact compatibility and for current stock and pricing.