ISW Series Managed Industrial Ethernet Switch Hardware Installation Guide

Generation deployment considerations

Industrial grade SFPs, with maximum temperatures of up to 85°C, are required for extended temperature operations.
ISW-Series switches are fan-less. In order to achieve the rated operating temperature, the switches require an airflow of 40 to 100-LFM.

SFPs are the primary component at risk for exceeding their thermal limits. SFPs will maintain operation in a safe environment through the reduction of PoE power in the system.
When the system enters operational restriction mode due to thermal limits, the PoE power is reduced from 360W total to 180W total. The highest numbered ports drop PoE in decreasing order until the PoE power is at or under 180W.
In the event the reduction to 180W of PoE power is insufficient, ALL PoE power delivery is turned off.
If the system continues to overheat, the SFP TX/RX is turned off until the system cools down below 65°C (ambient).

System operational specifications as provided are for when the unit is racked and maintains 2-RU of separation above and below the unit, using 5-RU of total rack space.
When the unit is racked and maintains only 1-RU of separation above and below the unit, using 3-RU of total rack space, the thermal operational range is reduced.
When the unit is racked and does not provide any separation from adjacent racked equipment, using 1-RU of total rack space, the thermal operational range is extremely limited.
The system can support 720W of total PoE power. However, that is limited to distribution at a maximum of 240W for each set of 8 ports (1-8, 9-16, 17-24).
SFPs are the primary component at risk for exceeding their thermal limits. SFPs will maintain operation in a safe environment through the reduction of PoE power in the system.
When the system enters operational restriction mode due to thermal limits, all the right-most 8-ports (ports 17-24) drop PoE power.
When the system uses the SDR-960W PSU, it can achieve 720W of PoE power if the ambient temperature is under 60°C. Dual PSUs are required to operate at 720W of PoE if the temperature is over 60°C.