The Marconi SMA‑1/4 is a flexible and compact SDH (Synchronous Digital Hierarchy) access multiplexer designed to deliver STM‑1 (155 Mbps) and STM‑4 (622 Mbps) transmission capabilities within the same unit. Developed as a scalable access node, it offers a hybrid platform for both low and mid-capacity SDH transport applications, allowing operators to consolidate and deliver services such as E1 circuits, legacy leased lines, and business-class voice/data connections efficiently.
The SMA‑1/4 supports a variety of interface modules, including multiple E1 tributaries, STM‑1 and STM‑4 line ports, and Fast Ethernet cards. It features integrated cross-connect functionality, making it a versatile option for grooming, aggregating, and transporting services in small to medium-sized networks. With robust protection mechanisms and management integration, the SMA‑1/4 serves effectively in regional aggregation sites, business access points, and edge network locations.
Its ability to operate on both STM‑1 and STM‑4 levels—either independently or in a scalable deployment—makes it ideal for service providers seeking to optimize network assets and gradually transition between different bandwidth layers. At Carritech, we continue to support SMA‑1/4 deployments by sourcing complete systems, expansion modules, and accessories from our global network of suppliers. All hardware is tested to ensure reliability and compatibility, giving network operators peace of mind when managing legacy SDH assets.
Dual-Level Transport Support: Designed to support both STM‑1 and STM‑4 interfaces, enabling smooth scaling of transport capacity without a complete platform overhaul.
Integrated VC‑12 and VC‑4 Cross-Connect: Allows flexible mapping and switching of tributary traffic, supporting service-level routing and grooming at multiple hierarchy levels.
High-Density E1 Aggregation: Offers multiple E1 ports per chassis, supporting the transport of PDH voice/data traffic and integration of legacy systems into modern optical networks.
Fast Ethernet Over SDH: Some variants support Fast Ethernet mapping using virtual concatenation (VCG), enabling packet-based service delivery over traditional SDH infrastructure.
Compact & Scalable Design: Modular platform allows for easy upgrade and expansion in the field, with support for additional line interfaces or tributary ports.
Telecom-Grade Availability: Designed for continuous operation with redundant power feeds and protection switching for high network uptime.
Management Integration: Local and remote management through industry-standard protocols; compatible with Marconi’s SDH NMS platforms.
Ideal for Edge and Aggregation Roles: Whether as a last-mile node or regional aggregation point, the SMA‑1/4 is suited to locations where reliable synchronous transport is still essential.
Form Factor:
Rack-mounted chassis, typically 2U to 4U in height
Passive backplane with modular front-facing cards
Designed to fit 19-inch and ETSI-standard racks
Line Interfaces:
1 × STM‑1 optical or electrical port
1 × STM‑4 optical port
Hot-swappable line modules with SFP or fixed optics (1300 nm or 1550 nm depending on span)
Tributary Interfaces:
E1 (2 Mbps) interfaces via plug-in cards
Support for up to 63 E1 ports depending on configuration
Optional support for Fast Ethernet (10/100 Mbps) with GFP and LCAS functionality
Cross-Connect Matrix:
Full VC‑12 and VC‑4 non-blocking cross-connect
Supports grooming of lower-speed services into higher-capacity SDH containers
Management Interfaces:
Craft port for local access
Remote management via SNMP, TL1
Integration with Marconi’s Optical Management System (OMS)
Power Supply:
-48 VDC telecom-standard power input
Dual-feed power support for redundancy
Low power consumption (typically under 80W, depending on module configuration)
Cooling:
Active fan-based cooling with temperature monitoring
Replaceable fan tray for maintenance and reliability
Environmental Specifications:
Operating temperature: 0°C to +45°C
Humidity: up to 95% (non-condensing)
Designed for controlled indoor environments or cabinet installations
Compliance:
ITU-T G.707, G.783, G.783 Annex A
CE marked, EMC, ETSI and Telcordia certified
| Time Period | Brand / Company | Role / Notes |
|---|---|---|
| Early 2000s – 2006 | Marconi Communications / Marconi Corporation plc | The SMA‑1/4 was developed as a scalable access and aggregation SDH node, supporting both STM‑1 and STM‑4 transport with modular service integration. |
| 2006 – Present | Ericsson (legacy support only) | After acquiring Marconi’s telecom assets, Ericsson phased out active marketing of the SMA‑1/4 but maintained limited support under long-term service contracts. |
| Present (Secondary Market) | Independent Resellers & Support Specialists (e.g., Carritech) | Carritech sources SMA‑1/4 systems, modules, and accessories, providing tested, verified components to maintain and extend legacy SDH infrastructures in operational networks. |
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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.