Description:

The Cisco Catalyst WS-X4991 Fan Tray is used in Cisco Catalyst 4948 series switches to provide active cooling and airflow management for internal switch components. This fan tray module helps maintain proper operating temperatures by circulating air through the chassis, preventing overheating of processors, power supplies, and switching hardware during continuous network operation. Designed specifically for compatibility with Cisco Catalyst 4948 switches, it supports stable system performance and long-term hardware reliability in enterprise network environments. Network administrators and maintenance technicians commonly install this fan tray for repair, maintenance replacement, or system reliability upgrades in enterprise switching infrastructure.

Applications:

The Cisco WS-X4991 fan tray is commonly used in enterprise campus networks, data center switching environments, and corporate IT infrastructures where Cisco Catalyst 4948 switches are deployed. It is typically installed in network equipment racks and communication cabinets to ensure proper cooling of switching hardware, supporting reliable operation of high-performance network devices in environments with continuous data traffic and demanding workloads.

Technical Specifications:

• Manufacturer: Cisco Systems
• Manufacturer Part Number (MPN): WS-X4991
• Product Type: Fan Tray Module
• Compatibility: Cisco Catalyst 4948 Series Switches
• Function: Chassis cooling and airflow management
• Cooling Type: Multiple high-speed internal fans
• Installation Type: Hot-swappable fan tray module
• Airflow Direction: Front-to-back chassis airflow
• Monitoring: Integrated with switch system monitoring
• Application: Thermal management for enterprise network switches
• Mounting: Installed directly into switch fan tray slot
• Operating Environment: Designed for enterprise networking equipment racks

Common Replacements:

• Cisco WS-X4992 Fan Tray for Catalyst 4948
• Cisco FAN-MOD-4HS High-Speed Fan Module
• Cisco FAN-T2 Fan Tray Module