Chassis Cooling

The fans on the GigaVUE‑HC1 run at 100% of their maximum speed on power up, then drop to approximately 65% during normal operations. The fans are deployed in 2+1 redundancy mode, meaning that a single fan can fail and immediately the third fan can help the chassis maintain the appropriate cooling temperature at 40ºC ambient.They are also hot-swappable.Refer to Module Removal and Replacement Procedure (Hot Removal) for more information on hot-swapping the module.

The temperatures of five components: intake, exhaust, CPU, switch CPU, and GigaSMART CPU temperatures, are monitored. When a component crosses a pre-defined threshold, the fan speed is adjusted dynamically, in increments of approximately 10%.

An SNMP trap is sent when a component reaches the threshold for warning, alert, or critical temperature conditions. Refer to Table 1: Component Temperature Thresholds and Actions for the temperatures at which the warning, alert, and critical traps are sent.

Table 1: Component Temperature Thresholds and Actions

Exhaust Temperature	CPU Temperature	Switch CPU Temperature	GigaSMART CPU Temperature
85ºC Warning trap sent	90ºC Warning trap sent	105ºC Warning trap sent	90ºC Warning trap sent
90ºC Alert trap sent	95ºC Alert trap sent	115ºC Alert trap sent	95ºC Alert trap sent
95ºC Critical trap sent	100ºC Critical trap sent	140ºC Critical trap sent	100ºC Critical trap sent

The output of the following CLI command displays the current intake, exhaust, CPU, switch CPU temperatures, as well as the GigaSMART CPU temperature:

(config) show environment

...

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 Card cc1 (GVS-HC100/MB):

 Intake temperature :           36 C

 Exhaust temperature :          35 C

 Cpu temperature :              28 C

 Switch temperature :           51 C

 Cav temperature :              53 C

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 Card 2 (TAP-HC1-G10040):

 Intake temperature :           32 C

 Exhaust temperature :          31 C

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 Card 3 (TAP-HC1-G10040):

 Intake temperature :           33 C

 Exhaust temperature :          33 C

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The output of the following CLI command displays the fan speed in RPM (the normal operational speed is approximately 12000 RPM; the maximum speed is approximately 19000 RPM):

(config) show environment

...

-----------------------------------------------------------

 Fan tray 1 (FAN-HC1):

 1st fan :                      12136 RPM

 2nd fan :                      12136 RPM

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 Fan tray 2 (FAN-HC1):

 1st fan :                      12136 RPM

 2nd fan :                      12136 RPM

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 Fan tray 3 (FAN-HC1):

 1st fan :                      12288 RPM

 2nd fan :                      12136 RPM

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