The Alcatel 1651 SM is a compact Synchronous Digital Hierarchy (SDH) transmission multiplexer designed for access and edge transport networks. It provides a cost-effective solution for service providers and utility companies looking to deliver high-quality voice and data services over SDH infrastructure. With its small footprint and flexible configuration options, the 1651 SM is ideal for deployment in locations where space and power availability are limited.
Engineered to support STM-1 and STM-4 transmission rates, the Alcatel 1651 SM is capable of multiplexing a wide range of PDH and SDH signals, including E1, T1, and subrate interfaces. It offers reliable performance with built-in protection mechanisms such as SNCP and automatic protection switching, ensuring continuous service delivery even in the event of network disruptions.
The platform is managed via Alcatel’s 1350 Management Suite, providing a centralised interface for provisioning, monitoring, and troubleshooting. Its simple design and ease of integration with existing Alcatel systems make it a dependable building block in metro and regional networks. Whether supporting business access services, mobile backhaul, or mission-critical communication, the 1651 SM delivers a robust and scalable transport solution.
At Carritech, we provide comprehensive support for the Alcatel 1651 SM, including spare parts supply, repair services, and technical expertise. Our goal is to help extend the life of legacy network equipment while maintaining performance and reliability. With our global inventory and experienced engineering team, Carritech is a trusted partner for ongoing maintenance and lifecycle management of the Alcatel 1651 SM platform.
Compact SDH Access Platform
Designed for space-constrained environments, making it ideal for street cabinets, remote sites, or edge network installations.
Flexible Interface Support
Supports a variety of signal types including E1, T1, subrate interfaces, and STM-1/STM-4, offering versatile service delivery.
Efficient Multiplexing
Allows for grooming and aggregation of multiple low-speed signals into higher-capacity SDH streams.
Built-In Network Protection
Equipped with SNCP and APS capabilities for reliable service continuity and fast fault recovery.
Seamless Integration
Compatible with other Alcatel-Lucent SDH platforms and easily managed via the Alcatel 1350 Management Suite.
Low Power Consumption
Energy-efficient operation suited to locations with limited power availability.
Scalable and Future-Proof
Supports growth in network demand with options for STM-1 to STM-4 upgrades without significant hardware changes.
Carritech Support Services
Fully supported by Carritech, including tested spare parts, repairs, and technical guidance to extend product life and reduce downtime.
The Alcatel 1651 SM is a compact SDH multiplexer designed to operate at STM-1 (155 Mbps) or STM-4 (622 Mbps) levels, with flexible support for various tributary interfaces. It accommodates multiple PDH signals including E1 (2 Mbps), T1, and subrate interfaces, making it suitable for aggregating voice and data traffic in access or metro edge networks. The system allows for grooming and multiplexing of these inputs into standard SDH outputs for efficient transport across the network.
The unit includes integrated protection features such as Sub-Network Connection Protection (SNCP) and Automatic Protection Switching (APS), ensuring continuous operation and rapid failover in case of a fault. Clock synchronization is achieved through internal or external sources, and it supports SSM (Synchronization Status Messaging) to maintain network-wide timing accuracy.
Management of the Alcatel 1651 SM is handled via the Alcatel 1350 Management Suite, providing a centralized interface for provisioning, performance monitoring, and fault diagnostics. It supports both local and remote access through serial and Ethernet connections, offering flexible control options for field engineers and NOC teams alike.
Power is supplied through a -48V DC feed, and the system is designed for installation in ETSI-standard racks, with compact chassis options for space-limited environments. Environmental tolerance includes typical telecom operating conditions, with passive cooling and low power requirements contributing to overall energy efficiency.
| Period | Owner / Marketer | Notes |
|---|---|---|
| Late 1990s–2006 | Alcatel | Originally developed, manufactured, and marketed by Alcatel as the 1651 SM STM‑4 Add‑Drop Multiplexer as part of the 1600 series. |
| 2006–2016 | Alcatel‑Lucent | Following the 2006 merger between Alcatel and Lucent, the 1651 SM remained in the legacy SDH/ADM portfolio under Alcatel‑Lucent. |
| 2016–Present | Nokia | After Nokia’s acquisition of Alcatel‑Lucent in 2016, the 1651 SM became part of Nokia’s legacy product suite, with ongoing support and documentation offered. |
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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.