Nortel QPC43R (telecommunications transmission and networking portfolio) Telecom System Card / Module

The Nortel QPC43R is a Peripheral Signalling card from the legacy QPC-prefixed card range used on early Nortel SL-1 and Meridian 1 systems. QPC-prefix cards predate the later NT-prefixed part numbering scheme and were used on the earliest generations of Nortel’s digital PBX platform, handling functions such as signalling, switching and peripheral control within the system’s network shelf; this specific card handled peripheral signalling duties within that architecture. It sits in the same QPC-prefix legacy hardware family as other early SL-1/Meridian 1 cards such as the QPC412 InterGroup Switch and QPC447 Enhanced Conference cards from the same generation, all of which predate the Meridian 1/Option-series naming used on later hardware. Systems old enough to still be running original QPC-prefix cards are now a small and specialist part of the installed base, typically very long-serving PBX installations that have never been upgraded to later Meridian 1 hardware. Tech-Star (UK-based, shipped worldwide) supplies legacy Nortel PBX cards for continued support of older systems.