Alcatel-Lucent 9500-MPR MSS-8 Shelf 3DB18485CA – In‑Depth System Description

The Alcatel-Lucent 9500-MPR MSS-8 Shelf, identified by the assembly number 3DB18485CA, is a high‑capacity, modular microwave transmission platform designed for carrier‑grade packet radio backhaul. This 8‑slot chassis forms the indoor unit (IDU) of the 9500-MPR family, providing a flexible and resilient foundation for aggregating multiple TDM, Ethernet, and microwave radio interfaces. The specific configuration described includes a CRMM110BRA management and switch module, two CSM (Communication Service Modules) for redundancy, and three P8ETH (8‑port Ethernet) interface cards, delivering a feature‑rich solution for modern mobile and enterprise networks.

The MSS‑8 chassis measures 440 mm × 222 mm × 280 mm (19‑inch wide, 5U high) and is intended for standard rack mounting. Its robust steel construction includes integral EMC shielding and forced‑air cooling via four hot‑swappable fan trays arranged in a push‑pull configuration. The backplane is a high‑speed, multi‑layer PCB that provides high‑bandwidth connectivity between all slots, supporting data rates of up to 2.5 Gbps per slot with low latency. Redundant power entry modules (PEM) accept dual ‑48 VDC feeds with automatic load‑sharing and failover, ensuring 99.999% availability.

At the core of this system is the CRMM110BRA module, which serves as the central management and routing engine. This card hosts a powerful network processor and a control CPU running the 9500‑MPR operating system. It provides comprehensive network management via SNMP, CLI, and web interfaces, and supports synchronization distribution (IEEE 1588v2 PTP and Sync‑E) to all connected microwave ODUs and tributary cards. The CRMM also includes a Gigabit Ethernet management port and a console port for local access. Its built‑in flash memory stores configuration files, firmware images, and event logs for off‑line analysis.

For switching and service aggregation, the chassis includes two CSM (Communication Service Modules) configured in a 1+1 redundant pair. The CSM cards are high‑throughput fabric switches that handle packet forwarding, VLAN tagging, QoS scheduling, and traffic prioritization. They support MPLS-TP, MPLS, and VLAN-based switching for both Ethernet and TDM‑over‑packet traffic. Each CSM is equipped with an independent clock generator and can operate as the system clock master or slave, providing seamless switchover without frequency disturbances. The dual CSM architecture ensures that a single card failure does not interrupt service, with failover times under 50 ms.

Three P8ETH modules are installed, each providing eight 10/100/1000BASE‑T Gigabit Ethernet ports with optional SFP slots for fiber uplink. These cards are dedicated to high‑density Ethernet connectivity, supporting ports for direct connection to customer routers, base station controllers, or third‑party switches. The P8ETH cards incorporate hardware‑based QoS, VLAN stacking (Q-in-Q), and link aggregation (LACP) for increased bandwidth and redundancy. Each port can be configured for auto‑negotiation, forced speed/duplex, and energy‑efficient Ethernet (EEE) to reduce power consumption during idle periods.

The MSS‑8 shelf can be further populated with PDH (E1/T1) interface cards, microwave modem cards, or additional Ethernet cards to meet specific network needs. The 3DB18485CA configuration is pre‑optimized for high‑capacity packet transport, with the CRMM providing system intelligence, the CSMs offering redundant switching, and the P8ETH cards delivering abundant user‑side Ethernet ports. This balanced architecture is ideal for sites requiring aggregation of multiple microwave links, such as hub nodes in a ring topology or large cell sites with high backhaul demand.

Power consumption for this configuration is estimated at 150 W under typical traffic, with peak around 200 W. The chassis includes comprehensive monitoring of voltage, current, and temperature for each slot, with alarms generated when thresholds are exceeded. All cards support hot‑swap, allowing field replacement without powering down the entire shelf – a critical feature for live networks where maintenance windows are limited.

Network management is fully integrated. The CRMM collects performance data from all cards, including real‑time counts for Ethernet errors, TDM slips, and microwave link parameters (RSL, MER, BER). This data is presented via the 9500‑MPR Element Manager, which offers graphical dashboards, custom reports, and automated alarm correlation. The system also supports remote firmware upgrades for all modules, with automatic rollback in case of failures.

Environmental specifications are rigorous: operating temperature 0°C to 50°C, storage -40°C to +70°C, humidity 5% to 95% non‑condensing. The chassis is NEBS Level 3 compliant for shock, vibration, fire resistance, and EMC, making it suitable for central office, remote shelter, and even uncontrolled outdoor enclosures when paired with appropriate protection. The shelf also meets ETSI EN 300 019 and GR‑1089 standards.

Installation is facilitated by sliding rails, cable management brackets, and clearly marked port labels. The front panel includes LEDs for power, fan, alarm, and card‑specific status, enabling quick visual inspection. An integrated LCD panel (optional) can display the most critical system parameters without requiring a connected terminal.

In terms of scalability, the 3DB18485CA shelf can be expanded by adding more P8ETH cards or other interface modules. The backplane design supports future higher‑speed cards (e.g., 10 Gigabit Ethernet) as they become available, protecting the operator's investment. The 9500‑MPR platform is also fully interoperable with Alcatel‑Lucent's network management ecosystem, including the 5620 SAM and 5650 CPAM, for end‑to‑end service provisioning and performance assurance.

Overall, the Alcatel‑Lucent 9500‑MPR MSS‑8 Shelf with the CRMM110BRA, dual CSM, and triple P8ETH configuration is a powerful, resilient, and future‑ready foundation for microwave backhaul. Its modularity, high reliability, and extensive management capabilities make it the preferred choice for operators who demand carrier‑class performance in today's all‑IP transport networks. This chassis exemplifies Alcatel‑Lucent's commitment to engineering excellence and operational simplicity.