Mostly every important modules in these modular switches like 6500 has temperature sensors to guage there temperatures and provide alerts in time.
EARL stands for Enhanced Address Resolution Logic. It is gives the 6500, the ability to do packet forwarding in hardware. EARL is nothing but a set of ASICs or CHIPs that does forwarding lookups at hardware level. The same job that a CPU or Proccesor does. But by doing forwarding lookups in hardware and not involving the CPU, helps us to achieve the Millions Packet/Sec rate.
The VTT(voltage termination) module are three replaceable voltage termination (VTT) modules (WS-C6K-VTT-E=) that provide reference voltage for bus signals.
These temperature sensors are for these two hardware modules/ASICs to monitor.
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