The Marconi SMA‑1 is a compact, cost-effective SDH (Synchronous Digital Hierarchy) access multiplexer designed to deliver high-quality voice and data services over optical transmission networks. Positioned as an entry-level solution within the Marconi SMA/MSH series, the SMA‑1 is ideal for last-mile delivery, small aggregation sites, or remote access locations where full SDH transport and service flexibility are required within a limited footprint.
This node provides STM‑1 optical interfaces for network-side connections and supports multiple E1 tributaries for PDH access. It includes integrated cross-connect capabilities, enabling grooming and routing of services at the VC‑12 level. With its built-in management features, low power consumption, and robust construction, the SMA‑1 became a popular solution for telecom providers deploying SDH at the edge of their networks—especially in areas where compact, reliable, and low-maintenance operation is crucial.
Although the SMA‑1 is now considered legacy equipment, it remains in active use in many parts of the world due to its proven reliability and compatibility with wider SDH networks. Carritech supports ongoing SMA‑1 operations by sourcing and supplying complete units, plug-in modules, and accessories from verified secondary market partners. Every component is thoroughly tested to ensure compatibility and operational stability within existing legacy systems.
Compact SDH Access Multiplexer: Optimized for deployment in access networks, roadside cabinets, or customer premises where space and power are limited.
STM‑1 Optical Interface: Provides a standard 155 Mbps SDH uplink for connection to larger SDH nodes or transport rings.
Tributary Capacity: Supports a wide range of E1 inputs for PDH traffic, often used to carry voice or low-speed data services.
VC‑12 Cross-Connect: Integrated cross-connect functionality at the VC‑12 level allows flexible service routing and grooming across E1 circuits.
Carrier-Grade Reliability: Designed for long service life with minimal operational overhead, making it suitable for unattended sites.
Integrated Management: Local and remote access via standard telecom protocols allows seamless integration into existing network operations.
Low Power Design: Efficient and cool-running, ideal for passive telecom enclosures or areas with strict power budgets.
Flexible Deployment: Suitable for mobile backhaul, business service delivery, or bridging legacy systems to optical networks.
Form Factor:
Rack-mounted or wall-mountable compact chassis
Typically occupies 1U to 2U of vertical space depending on model variant
Network Interfaces:
1 × STM‑1 optical port (OC-3 equivalent)
1300 nm or 1550 nm wavelength, depending on configuration
Optional electrical STM‑1 variants available in some deployments
Tributary Interfaces:
Up to 21 × E1 ports (2 Mbps) standard
BNC or RJ48 connectors depending on build
Framing and signaling compatible with ITU-T G.703/G.704
Cross-Connect Matrix:
VC‑12 non-blocking switch
Fully software-controlled mapping of E1 inputs to SDH containers
Management:
Local interface for craft terminal access
Remote management via SNMP or TL1
Compatible with Marconi’s legacy NMS platforms
Power Supply:
-48 VDC input typical for telecom environments
Low power consumption (<50W depending on configuration)
Optional dual-feed power input for redundancy
Cooling:
Fanless design in most models
Passive cooling suitable for harsh or enclosed environments
Environmental Performance:
Operating temperature: 0°C to +50°C
Humidity: up to 95% non-condensing
Compliant with ETSI environmental guidelines for outdoor telecom enclosures
Compliance:
ITU-T G.707, G.703, G.783 SDH standards
CE, ETSI, and Telcordia compliant
EMC and safety compliant for telecom central office installations
| Time Period | Brand / Company | Role / Notes |
|---|---|---|
| Late 1990s – 2006 | Marconi Communications / Marconi Corporation plc | The SMA‑1 was developed as part of Marconi’s SDH product suite, aimed at edge and access network applications, offering reliable last-mile optical delivery. |
| 2006 – Present | Ericsson (legacy support only) | Following Ericsson’s acquisition of Marconi’s telecom division, the SMA‑1 was no longer actively marketed, though legacy support remained in place for major deployments. |
| Present (Secondary Market) | Independent Resellers & Support Specialists (e.g., Carritech) | Carritech continues to support SMA‑1 users by sourcing tested units and modules, providing lifecycle extension solutions for networks that rely on compact SDH access infrastructure. |
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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.