Cisco device HighThreshold calculation
If the device is a Cisco device and has a ciscoEnvMonTemperatureThreshold = 105 and the RelativeTemperatureThreshold is defined as = 10.0000
This gives a HighThreshold = 94.5000 (105 - 10%).
Juniper device HighThreshold Value
On a Juniper device, this HighThreshold Value is taken as the "High Temperature Threshold" configured in polling and thresholds. Juniper devices do not provide recommended "High Threshold" recommendations in their MIBs, so the Smarts High Temperature Threshold setting was added to facilitate the equivalent functionality on these devices as is native on Cisco devices.
See also KB Article emc228431 for details on how TempSensor OutOfRange events are generated on Cisco 6509 devices.