Vertiv VP8641 Manual page 38

VERTIV INTELLIGENT RACK PDU
Rapid Spanning Tree Protocol (RSTP)
GU2 devices include two Ethernet ports which work together as an internal Ethernet bridge. One of these
ports can be used to connect the IMD to an existing network, or both ports can be used at the same time
to connect one IMD to another in a daisy-chain configuration.
When both network interfaces are connected, the IMD implements a network bridging protocol called
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 regu-
larly checks for changes in the network topology. W hen a connection is lost, RSTP allows the bridges to
quickly switch to a redundant path.
Visible Light Communication (VLC)
The VLC feature on Vertiv Upgradeable PDUs allows the user
into a database management system via the
opportunities to monitor and enable larger amounts of PDU power data to be obtained via the unit's dis-
play, and all without physically connecting to the PDU.
Using a smart device, such as a smart phone or tablet with the Vertiv 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 Vertiv Upgradeable LED display will provide the Current (Amps) per input and cir-
cuit/breaker. By enabling the VLC feature, the LED Display will scroll through a set of alpha-numeric char-
acters. Utilizing the Vertiv 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
RSTP protocol imposes a limit of 40 links between bridges, including IMDs.
embedded LED display. This product feature provides new
to unobtrusively upload product information
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