Cisco C9550 Series Smart Switches Hardware Installation Guide

Environmental specifications

Updated: July 17, 2026

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Environmental specifications of the switch, power supply modules, and fans.

This section describes the environmental specifications for the Cisco C9550 Series Smart switches, power supply modules, and fans.

Table 1. Environmental specifications for the switch
Environmental ranges
Operating temperature	With C9550-FAN-1U-F: -5°C to +35°C (23° to 95°F) With C9550-FAN-1U-R: -5°C to +45°C (23° to 113°F) With C9550-FAN-2U-F: -5°C to +35°C (23° to 95°F) With C9550-FAN-2U-R: -5°C to +45°C (23° to 113°F)
Storage temperature	-40°C to 70°C (-40° to 158°F)
Relative humidity	Operating: 10% to 85% (noncondensing) Non-Operating: 0% to 95% (noncondensing)
Operating altitude	Up to 6,000 feet (1,800 m)
Storage altitude	Up to 10,000 feet (3,000 m)
Heat dissipation (in British Thermal Units [BTU])	1000 BTU/hr = 293W C9550-24L4CD: 1,880 BTU/hr C9550-48L4CD: 2,000 BTU/hr C9550-96L4D: 3,200 BTU/hr

Acoustic measurements

This section lists the acoustic measurements for the different switch models.


Switch model	Sound power level
C9550-24L4CD	Not greater than 87.2 L_WAd dB
C9550-48L4CD	Not greater than 85.7 L_WAd dB
C9550-96L4D	Not greater than 89.3 L_WAd dB

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