ABB Relion 650 Series Applications Manual page 253

1MRK 505 287-UUS B
16.3 SNTP server requirements
16.3.1 SNTP server requirements
The SNTP server to be used is connected to the local network, that is not more than 4-5 switches
or routers away from the IED. The SNTP server is dedicated for its task, or at least equipped with a
real-time operating system, that is not a PC with SNTP server software. The SNTP server should be
stable, that is, either synchronized from a stable source like GPS, or local without synchronization.
Using a local SNTP server without synchronization as primary or secondary server in a redundant
configuration is not recommended.
Busbar protection REB650
Application manual
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Section 16
Requirements
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