Description
Nortel Meridian MMP40 Processor Card NT4R45AA PBX Telephony Module
The Nortel Meridian NT4R45AA is the MMP40 (Multi-Media Processor) card used in Nortel Meridian 1 PBX systems. This large-format processor board serves as a central processing and control module within the Meridian switching platform, handling call processing, system management, and coordination between other cards in the shelf. It is a densely populated board carrying multiple processor and memory ICs, edge connectors for backplane interfacing, and daughter-card sockets.
Specifications & What's Included
- Manufacturer: Nortel (Northern Telecom)
- Model: MMP40
- Part Number: NT4R45AA
- Secondary Part Number / Barcode: NNTM1832L37P
- Type: Processor Card / PBX Module
- Form Factor: Full-size backplane card / module
- Compatible System: Nortel Meridian 1 PBX
- Board features multiple processor ICs, memory ICs (SRAM/DRAM), and large-scale integration chips visible on both sides
- Edge connector interface for Meridian equipment shelf backplane
- Blue retention/ejector levers on leading edge for shelf insertion and removal
- Includes card only — no cables or accessories
Applications
The Nortel Meridian 1 is an enterprise-class PBX telephone switching system introduced in the 1980s and widely deployed through the 1990s and into the 2000s in large corporate, government, and institutional environments. The MMP40 processor card is one of the core control modules in this platform, responsible for call processing intelligence and system coordination. Meridian 1 systems were built around a modular card-cage architecture, meaning individual cards like this one could be replaced or upgraded independently. The platform remained in widespread service for many years, and replacement cards like the NT4R45AA continue to be sought by organizations maintaining legacy Meridian 1 installations, telecom refurbishers, and spare-parts depots supporting long-lifecycle PBX infrastructure.
This Nortel Meridian MMP40 Processor Card (NT4R45AA) has been inspected and is in good used condition. The board shows normal wear consistent with prior use in a PBX environment. No obvious physical damage is noted. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Nortel |
Model: |
MMP40 |
MPN: |
NT4R45AA |
Secondary Model: |
NNTM1832L37P |
SKU: |
15320 |
Type: |
Processor Card / PBX Module |
Compatible With: |
Nortel Meridian 1 PBX System |
Form Factor: |
Card / Module |
Condition: |
Used – Inspected |
Seller Notes: |
Card only; no additional accessories included. |
Country/Region of Manufacture: |
Canada |
Condition Notes: |
Nortel Meridian MMP40 NT4R45AA Processor Card. Inspected and in good used condition. Normal wear from prior PBX use. No obvious damage. See photos. |
