Alcatel Lucent MDR-8000 Microwave Digital Radio (MDR-8606-45)

The Alcatel Lucent MDR‑8000 is a legacy point‑to‑point microwave digital radio system that has been widely deployed for long‑haul telecommunications and private network backbones. The specific configuration MDR‑8606‑45 is a high‑capacity variant that includes 13 functional modules, providing a complete transceiver, modem, multiplexing, and protection switching in a single rack‑mounted shelf. This system supports both PDH (e.g., DS3/E3) and SDH (STM‑1/4) interfaces, making it a versatile solution for interconnecting central offices and corporate sites.

Overview

The MDR‑8000 series is known for its robust mechanical design, advanced forward error correction (FEC), and adaptive equalization, which enable reliable transmission over distances up to 80 km under various atmospheric conditions. The MDR‑8606‑45 operates in the 6 GHz and 11 GHz bands (depending on module configuration) and can handle capacities ranging from 2×DS3 up to 4×STM‑1. The 13 modules typically include a power supply, main and standby transceivers, modem, protection switch, and interface cards, all arranged in a 4U shelf.

Key Features

• Modular architecture with field‑replaceable units (FRUs) for all functions

• Supports 1+1 hot‑standby protection with automatic switchover

• Frequency agility – software‑selectable channel tuning

• Advanced FEC: Reed‑Solomon and trellis coding for improved link budget

• Built‑in spectrum analyzer and BER monitoring

• Interface options: DS3, E3, STM‑1 (copper/fiber), and Ethernet (optional)

• Low power consumption per circuit

• Management via craft terminal and SNMP

Technical Specifications (Typical)

• Frequency Bands: 6.4‑7.1 GHz, 10.7‑11.7 GHz (depending on modules)

• Transmitter Output: +27 dBm to +33 dBm (adjustable)

• Receiver Threshold: -82 dBm for 10⁻⁶ BER (for 2×DS3)

• Capacity: Up to 4×STM‑1 (622 Mbps aggregate)

• Modulation: QPSK, 16QAM, 64QAM (adaptive)

• Interface Modules: Up to 13 slots including power, transceiver, modem, MUX, and protection

• Power Input: -48 VDC (dual feed)

• Dimensions: 178 mm (H) × 483 mm (W) × 380 mm (D) – 4U

• Operating Temperature: -10°C to +50°C

Applications

The MDR‑8000 has been used for trunk connections between telephone exchanges, for utility company SCADA networks, and for military communications. Its high reliability and proven performance in harsh environments make it a trusted platform for mission‑critical links. It is also used as a cost‑effective alternative to leased fiber in rural areas.

Management and Maintenance

The system can be configured and monitored via a local craft terminal using an RS‑232 port. An optional network management agent allows integration into larger NMS platforms. The 13 modules are individually hot‑swappable, allowing repairs without taking the entire link down. Routine maintenance includes checking antenna alignment, verifying power levels, and cleaning air filters.

Conclusion

The Alcatel Lucent MDR‑8000 MDR‑8606‑45 with its comprehensive 13‑module configuration remains a benchmark for legacy microwave digital radio systems. Its combination of modularity, protection features, and wide capacity range continues to serve operators who require reliable, high‑capacity point‑to‑point microwave connectivity.