Chapter 3 - Setup
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© 2017 Geist
GM1157
When both network interfaces are connected, the IMD implements a network bridging protocol called
the Rapid Spanning Tree Protocol (RSTP). RSTP is an IEEE standard that is implemented by all
managed bridges. Using RSTP, bridges in the network exchange information to find redundant paths,
or loops.
When a loop is detected, the bridges in the network work together to temporarily disable the redundant
paths. This allows the network to avoid broadcast storms caused by the loops. In addition, RSTP
regularly checks for changes in the network topology. When a connection is lost, RSTP allows the
bridges to quickly switch to a redundant path.
NOTE
RSTP protocol imposes a limit of 40 links between bridges, including
IMDs.
Visible Light Communication (VLC)
The VLC feature on Geist Upgradeable PDUs allows the user
to unobtrusively upload product
information into a database management system via the
embedded LED display. This product feature
provides new opportunities to monitor and enable larger amounts of PDU power data to be obtained via
the unit’s display, and all without physically connecting to the PDU.
Using a smart device, such as a smart phone or tablet with the Geist Mobile app installed, it is
possible to capture data from the LED display when running in VLC mode, which can be
enabled/disabled easily by using the display buttons on the device, or using the GUI on monitored
units.
By default, the Geist Upgradeable LED display will provide the Current (Amps) per input and
circuit/breaker. By enabling the VLC feature, the LED Display will scroll through a set of alpha-numeric
characters. Utilizing the Geist Mobile app the user can scan the LED display and retrieve additional
power metrics which include Volts, Amps, Watts, Volt-Amps and Kilowatt Hours. Before VLC, the
power data was only available on network connected PDUs by viewing the GUI, or using external
software to collect and display the data. The VLC feature provides this data on local metered only
devices, as well as on monitored units without the need to connect them to the network.
NOTE
To Enable VLC – Press the center square
button
three times in
under 2 seconds as shown in the IMD section - Please see the
Interchangeable Monitoring Device and/or Display section for addition
information regarding how to enable/disable VLC mode.