The Marconi MSH‑51 is a high-capacity, modular SDH (Synchronous Digital Hierarchy) multiplexer designed to operate at the core or aggregation layer of legacy telecom transport networks. Positioned between access and backbone environments, the MSH‑51 provides powerful cross-connect capabilities, multiple STM‑1/STM‑4/STM‑16 interface options, and extensive tributary support, making it ideal for dense voice, data, and leased-line traffic aggregation.
Built to handle large volumes of synchronous traffic, the MSH‑51 offers full VC-12 and VC-4 cross-connect functionality, enabling flexible grooming and rerouting of traffic with integrated protection mechanisms. Its modular architecture allows service providers to scale capacity and functionality according to operational needs. The system is widely deployed in metro networks, regional aggregation sites, and national transmission hubs that rely on SDH for guaranteed service delivery and reliability.
Though no longer manufactured or supported directly by the OEM, the MSH‑51 continues to operate in numerous networks around the world. Carritech helps operators maintain, expand, or decommission Marconi MSH‑51 deployments by sourcing tested equipment and replacement modules through our extensive global supply network.
Modular High-Capacity Design: Scalable system architecture to support dense SDH transport and flexible network deployment.
Comprehensive Interface Support: Accommodates STM‑1, STM‑4, and STM‑16 line interfaces, as well as a wide range of E1 tributary modules.
Full Cross-Connect Capability: Offers non-blocking VC-12 and VC-4 switching, allowing for granular service routing and grooming across large networks.
Integrated Protection Mechanisms: Supports SNCP (Sub Network Connection Protection), MSP (Multiplex Section Protection), and automatic switch-over for improved service availability.
Flexible Expansion: Add-in card slots for new services, enabling upgrades without full replacement of the chassis.
Carrier-Grade Reliability: Built for continuous 24/7 operation in telecom environments, with redundant power and fan systems.
Remote Network Management: Supports local and remote management using standard protocols; compatible with Marconi’s SDH network management systems.
Long Service Life: Designed to remain in service for extended lifecycles, making it ideal for network stability during phased transitions to newer technologies.
Form Factor:
Modular rack-mounted shelf
Typically 7U to 9U height, depending on configuration and number of interface cards
Transmission Interfaces:
Multiple STM‑1, STM‑4, and STM‑16 optical ports supported
Configurable based on installed line cards
Tributary Interfaces:
High-density support for E1 (2 Mbps) channels
Optionally supports T1 or other PDH interfaces in certain configurations
Cross-Connect Capacity:
Full non-blocking matrix supporting VC‑12 and VC‑4 cross-connections
Capable of handling thousands of simultaneous connections
Protection and Resilience:
Dual power supplies
Redundant fan trays
Software-controlled protection switching
Power Supply:
Standard telecom -48 VDC input
Dual feed for redundancy
Cooling:
Active fan-based system
Front-to-back airflow with replaceable fans
Environmental Conditions:
Operating temperature: 0°C to +45°C
Humidity: Up to 95% non-condensing
Designed for central office and controlled environments
Management:
Local terminal access
Remote management over SNMP or TL1
Compatible with legacy Marconi NMS platforms
Certifications:
Built to conform to ITU-T SDH standards
ETSI and Telcordia compliant for installation in carrier environments
| Time Period | Brand / Company | Role / Notes |
|---|---|---|
| Early 2000s – 2006 | Marconi Communications / Marconi Corporation plc | Original designer and marketer of the MSH‑51, positioned for high-capacity SDH aggregation and metro core applications. |
| 2006 – Present | Ericsson (legacy support only) | Following Ericsson’s acquisition of Marconi’s telecom division, MSH‑51 was maintained temporarily for ongoing projects, but removed from active product development shortly after. |
| Present (Secondary Market) | Independent Resellers & Support Specialists (e.g., Carritech) | Carritech sources and supplies MSH‑51 systems, modules, and accessories, offering lifecycle extension, technical support, and logistics solutions for legacy SDH operations. |
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From expert maintenance and repair to reliable part sourcing and technical consultation, we provide comprehensive support for every stage of your network’s lifecycle. Whether you’re extending the life of legacy systems or integrating with modern infrastructure, our team ensures seamless, efficient, and cost-effective solutions—so you can focus on performance, not problems.