How to identify the airflow into and from the switch, and to position the FRUs to ensure proper cooling.
The switch is positioned with its ports in either the front or the rear of the rack, depending on your cabling and maintenance requirements. To identify the airflow options for your switch, see the user-replaceable components in the Overview section of this document. Position the fan and power supply modules to move the coolant air from the cold aisle to the hot aisle in one of these ways:
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Port-side exhaust airflow: Cool air enters the chassis through the fan and power supply modules in the cold aisle and exhausts through the port end of the chassis in the hot aisle.
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Port-side intake airflow: Cool air enters the chassis through the port end in the cold aisle and exhausts through the fan and power supply modules in the hot aisle.
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Single-direction airflow: The direction of the installed fan modules determines the airflow.
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For port-side exhaust airflow, the N9348Y12C-SE1switch can support QSFP-100G-SR1.2 on rows 1 and 3 at a maximum ambient temperature of 35°C and on row 2 at a maximum ambient temperature of 30°C. It can also support QSFP-100G-SM-SR and QSFP-40/100-SRBD on rows 1, 2, and 3 at a maximum ambient temperature of 35°C.
For port-side intake airflow, there is no limitation.
You can identify the airflow direction of each fan and power supply module by its coloring.
To prevent the switch from overheating and shutting down, position the air intake for the switch in a cold aisle. The fan and power supply modules must have the same direction of airflow. To change the airflow direction for the switch, shutdown the switch before changing the modules.