Nortel Meridian QPC574A Digital Receiver Card SL1 PBX Telephone System Module

Nortel Meridian QPC574A Digital Receiver Card SL1 PBX Telephone System Module

The Nortel Meridian QPC574A is a Digital Receiver (DGT RCVR) card designed for use in the Nortel Meridian SL1 PBX telephone system. It is a slot-in circuit board module that installs into the SL1 system chassis and provides digital receiver functionality within the switching fabric of the PBX.

Specifications & What's Included

• Manufacturer: Nortel (Northern Telecom / Meridian)
• Model / Part Number: QPC574A
• Type: Digital Receiver Card (DGT RCVR)
• Compatible System: Nortel Meridian SL1 PBX Telephone System
• Form Factor: Slot-in PCB module with front panel faceplate and ejector levers
• Front panel label: DGT RCVR (Digital Receiver)
• Card edge connector for SL1 chassis backplane
• Multiple ICs and logic chips visible on component side
• Includes: card only — no additional accessories

Applications

The Nortel Meridian SL1 was a widely deployed enterprise PBX platform introduced in the late 1970s and expanded through the 1980s and 1990s, serving large organizations including corporations, universities, hospitals, and government agencies. The SL1 used a modular card architecture — each functional capability (line interfaces, trunks, conferencing, signal receivers) was delivered by a dedicated circuit card that seated into the system's card cage. The QPC574A Digital Receiver card provides tone and signal detection capability within the SL1 switching environment, handling incoming digital signaling from attached lines or trunks. Replacement cards like this are sought by organizations still maintaining legacy Nortel Meridian SL1 systems, as well as technicians performing repairs, and collectors of vintage telecommunications hardware. The SL1 platform has been largely superseded by IP-based communications systems, but many installations remained in service well into the 2000s and some legacy sites still rely on original hardware for day-to-day operation.