Lenovo System x PDU, Technical Reference

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Environmental Monitoring Probe for Monitored PDUs
Figure 112 displays the Environmental Monitoring Probe (EMP) which connects to the
PDU. Some Monitored PDUs ship standard with the probe, and for others it can be
ordered optionally.
Although the EMP device needs to be connected to a monitored PDU to function, the
EMP device is not a necessity for the monitored PDU to function. The monitored PDUs
have their own internal sensors to report on temperature and humidity values of the
PDU.
The EMPs purpose is to report on local environmental temperature and humidity at its
installed location. For example, if the EMP device is installed at the top of a rack, it
will report on the temperature and humidity values at that location.
The EMP reports the local temperature and humidity values to management tools
such as Lenovo Systems Director Active Energy Manager (AEM) or to the PDU web
interface. The following image shows an example of the EMP connected to an Lenovo
Monitored PDU communication port via a CAT5 cable.
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Figure 113: EMP connection example to PDU
Figure 112: The EMP