Cisco C9550 Series Smart Switches Hardware Installation Guide

Environmental specifications

Updated: September 30, 2026

Want to summarize with AI?

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 C9550-32C: 2,200 BTU/hr C9550-48L4CD: 2,000 BTU/hr C9550-64C-XL: 3,754 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	Maximum value: Not greater than 87.2 L_WAd dB Typical value: 60.4L_WAd dB at 27C
C9550-48L4CD	Maximum value: Not greater than 85.7 L_WAd dB Typical value: 61L_WAd dB at 27C
C9550-96L4D	Not greater than 89.3 L_WAd dB Typical value: 66.7L_WAd dB at 27C

Need help?

Open a support case

(Requires a Cisco Service Contract)

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.