Alcatel-Lucent 9500 MPR 8‑Slot Shelf (3DB18485AB) with 4 Modules – Complete Product Description
The Alcatel‑Lucent 9500 MPR (Microwave Packet Radio) 8‑Slot Shelf, designated by the assembly number 3DB18485AB, is a high‑capacity indoor unit (IDU) designed for modern packet‑based microwave backhaul networks. This shelf serves as the central hub for aggregating multiple TDM, Ethernet, and radio frequency interfaces, offering a flexible and resilient platform for mobile operators, utility companies, and enterprise network providers. The configuration described includes the base chassis populated with four pre‑installed functional modules, delivering a ready‑to‑deploy solution for a variety of transport scenarios.
The mechanical construction of the 3DB18485AB is robust and fully compliant with 19‑inch rack standards, occupying 5U of vertical space. The steel enclosure provides excellent electromagnetic shielding and structural integrity, while the front bezel offers easy access to all module slots and status indicators. The chassis is designed for both front and rear cable access, with integrated cable management guides to maintain neat and organized wiring. The entire unit weighs approximately 12 kg when fully populated and is rated for continuous operation in telecommunications environments.
At the heart of the shelf is a high‑speed, passive backplane that provides dedicated data, control, and power connections to each of the eight slots. The backplane supports full‑duplex communication at rates exceeding 2.5 Gbps per slot, with low latency and deterministic performance. Each slot is keyed to accept specific module types, including modem cards, Ethernet interface cards, PDH (E1/T1) cards, and management cards. The backplane also distributes system clock and synchronization signals, ensuring phase and frequency alignment across all modules.
Power entry is dual‑redundant, with two front‑accessible power supply modules accepting ‑48 VDC inputs. These hot‑swappable power supplies feature automatic load‑sharing and seamless failover, guaranteeing uninterrupted operation even during power module maintenance. Each supply is rated at 150 W, providing ample headroom for a fully populated shelf. The power distribution circuitry includes over‑voltage, over‑current, and reverse‑polarity protection, as well as inrush current limiting to protect the backplane and modules.
Cooling is provided by a rear‑mounted, hot‑swappable fan tray containing four high‑performance fans. The fans are temperature‑controlled, adjusting their speed based on ambient and internal temperature sensors to minimize acoustic noise while maintaining safe thermal conditions. The airflow path is front‑to‑back, aligning with typical data center and central office cooling strategies. The shelf is rated for operation in ambient temperatures from 0°C to 50°C and relative humidity up to 95% non‑condensing.
The specific configuration includes four modules that have been pre‑installed to offer a balanced set of capabilities. Typically, these include one system management module (CRMM or equivalent), one or two modem modules for connection to outdoor units (ODUs), and one high‑density Ethernet interface module (e.g., P8ETH or similar). The management module hosts the central processor, network management agent, and synchronization distribution functions. The modem modules handle the microwave RF interface, including modulation, demodulation, and forward error correction. The Ethernet module provides multiple Gigabit Ethernet ports for customer‑side connectivity.
All modules are fully hot‑swappable, enabling field replacement or upgrade without powering down the entire shelf. The system automatically detects newly inserted modules, loads appropriate firmware, and integrates them into the operational configuration without manual intervention. This feature dramatically reduces downtime during maintenance or capacity expansion.
From a network management perspective, the 9500 MPR shelf integrates seamlessly with Alcatel‑Lucent's Element Management System (EMS) and higher‑level network management platforms. The shelf supports SNMP v3, CLI, and web‑based GUI for configuration, monitoring, and troubleshooting. Real‑time performance data, including error statistics, throughput, and environmental parameters, are collected per slot and per port, allowing proactive fault detection and capacity planning.
Synchronization capabilities are comprehensive. The shelf includes an internal stratum‑3 clock with holdover performance, and it supports Synchronous Ethernet (Sync‑E) and IEEE 1588v2 Precision Time Protocol (PTP) with hardware timestamping. External timing references can be connected via BNC inputs for 2.048 MHz or 1.544 MHz reference signals, as well as for GPS/GLONASS receivers. This ensures the shelf can serve as a frequency and phase source for mobile backhaul applications requiring tight alignment.
Compliance and certifications include NEBS Level 3 (GR‑63‑CORE and GR‑1089‑CORE), ETSI EN 300 019, FCC Part 15, and RoHS directives. The shelf has undergone extensive environmental testing, including temperature cycling, vibration, shock, and humidity resistance, ensuring reliable operation in uncontrolled shelters and outdoor cabinets (with appropriate environmental protection).
Typical deployment scenarios for the 3DB18485AB include hub sites in microwave ring topologies, large cell sites with multiple radio links, and enterprise private networks requiring high‑capacity connectivity. Its modular architecture allows operators to start with a minimal configuration and expand by adding more interface modules as traffic grows, protecting initial investment and enabling gradual network evolution.
In summary, the Alcatel‑Lucent 9500 MPR 8‑Slot Shelf 3DB18485AB with its four pre‑installed modules offers a powerful, scalable, and highly reliable indoor unit for modern microwave backhaul. Its combination of high‑density backplane, redundant power, intelligent cooling, and extensive management features makes it an ideal choice for operators seeking to build resilient, future‑ready transport networks.
