4. Appendix
4-9
TI 30A10A05-01E
Mar. 15, 2019-00
4.5 PrecautionswhenInstallingNetwork
Devices
n Power supply for network devices
To avoid redundant Vnet/IP network devices connected to bus1 and bus 2 from failing at the
same time during a power failure, you must separate the power supply for network devices
connected to bus 1 and bus 2. In addition, use an uninterruptible power supply (UPS) for each
power supply system to prepare for temporary power failure of both systems. A temporary power
failure occurs in situations such as when switching from a commercial power supply to standby
generators.
*1: When power is restored after a power failure, network devices cannot communicate immediately. It may take a few minutes for
the network devices to start up and resume communication. Therefore, ensure that you take precautionary measures for all
network devices against power failures.
n Vnet/IP cable connection
Connect appropriate cables and conrm the link is up with the correct transmission speed.
Please refer to section 4.3 “Cable for Vnet/IP”.
n Environmental conditions
We provide recommended layer 2 switches and layer 3 switches that are suitable for harsh
environments. Use a device that is suitable for the environment where you want to use it.
To install network devices that are not suitable for harsh environments, modify the system
conguration based on the installation environmental specications of the device.
n InstallinglightningprotectionandGPSantennaforSNTPservers
GPS antennas for SNTP servers are usually installed outdoors for them to capture signals from
multiple GPS satellites. If you install a GPS antenna outdoors, ensure that you install it in a
location that is protected by a lightning conductor. Ensure that you take safety measures against
lightning by adding a lightning surge protector.
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