Nortel NTHR16GA R03 56G Fabric Module

The Nortel Networks NTHR16GA R03 is a 56G Fabric Module (also referred to as Fabric CD) designed for the Nortel Passport MSS 15000 (Multi-Service Switch 15000) multiservice switching platform. It serves as a high-capacity switch fabric card responsible for high-speed cell and packet switching, traffic management, and non-blocking interconnection between line cards and other system modules within the MSS 15000 chassis.This fabric module provides 56 Gbps switching capacity and supports the scalable, carrier-grade architecture of the Passport MSS series. It handles cell-based switching for ATM, Frame Relay, IP, and multiservice traffic, ensuring low-latency, high-throughput performance required for core and edge multiservice networks. The R03 revision typically includes hardware enhancements for improved reliability, thermal characteristics, and compatibility with later software loads.
The NTHR16GA integrates with the MSS 15000 backplane, working in conjunction with control processors, line interface cards, and other fabric modules (often in redundant or load-sharing configurations) to deliver full-mesh or multistage fabric connectivity. It supports quality of service (QoS) mechanisms, traffic shaping, and congestion management essential for converged voice, video, and data services.
For installation and maintenance, the module occupies a dedicated fabric slot in the Passport MSS 15000 shelf. It is engineered as a field-replaceable unit with robust backplane connectors for reliable mating. The card operates on standard -48 VDC telecom power and includes front-panel indicators for power, fabric status, alarms, and link/activity. Proper airflow and cooling are critical due to the high switching density.
The fabric module is built for carrier-class reliability in central office environments, complying with NEBS-level requirements for electromagnetic compatibility, thermal performance, and high availability. It supports redundant fabric configurations to ensure continuous operation during module failures or maintenance activities. Built-in diagnostics and system-level monitoring facilitate fault isolation and performance tracking.
During operation, the NTHR16GA continuously manages internal switching paths, monitors fabric utilization, and reports status and alarms to the central control processor. Configuration, diagnostics, and firmware updates are performed through the Passport Element Management System or CLI, minimizing service impact.
The Nortel Networks NTHR16GA R03 56G Fabric Module is intended for high-capacity deployments in the Passport MSS 15000 platform, enabling scalable multiservice switching for ATM, IP, and legacy data services in carrier and large enterprise networks.