Alcatel-Lucent 3AL79772AAAC 01 1650SM-C Fan Unit

The Alcatel-Lucent 3AL79772AAAC 01 1650SM-C Fan Unit is a thermal management module engineered for active cooling and temperature regulation in the 1650 Synchronous Multiplexer - Compact (1650SM-C) transport platform for SDH/SONET network architectures. This module delivers forced-air cooling to maintain optimal operating temperatures for installed service interface boards, cross-connect modules, control units, and power distribution systems within the compact shelf enclosure. The 1650SM-C Fan Unit implements redundant fan tray architecture with multiple high-efficiency brushless DC fans featuring variable speed control based on real-time temperature monitoring to balance cooling performance with acoustic noise reduction and power consumption optimization. The module features integrated temperature sensors providing continuous monitoring of inlet and outlet air temperatures with automatic fan speed adjustment and alarm generation when temperature thresholds are exceeded. Advanced features include N+1 redundancy with automatic failover, hot-swappable design enabling field replacement without service disruption, individual fan failure detection with status reporting to the shelf controller, and intelligent airflow management to ensure uniform cooling across all installed modules. The fan unit connects to the shelf backplane for power distribution via −48 V DC feeds and for communication with the system control processor through I²C or SMBus interfaces for remote monitoring and management. Management interfaces include SNMP v3 and TL1 protocols for integration with Alcatel-Lucent's 1350 OMS and third-party network management systems, providing access to fan speed, temperature readings, airflow status, and alarm conditions. The module features electromagnetic interference (EMI) shielding and filtered air intake to prevent contamination of internal components. Environmental specifications comply with ETSI EN 300 019 Class 3.1 and NEBS GR-63 Level 3 standards, supporting continuous operation in controlled telecommunications facilities with ambient temperatures from 0 °C to +45 °C and relative humidity up to 95% non-condensing. The 1650SM-C Fan Unit is validated for deployment in Alcatel-Lucent 1650SM-C compact transport platforms and ensures compliance with Telcordia GR-487 and ETSI EN 300 386 standards for telecommunications equipment cooling and environmental protection.