Rm Transmission; Line Clock Synchronization - Siemens SWT 3000 Equipment Manual

Guard
Command
Command guard
Command transmission
Interval
In order to improve the cyber security of SWT 3000 against the injection of spoofed command packet into
Ethernet line, a message authentication mechanism (HMAC-SHA256) using secure crypto hash function is
implemented. Only the messages from authenticated far end SWT 3000 are accepted.
The SWT 3000 Ethernet line interface is compliant to IEC 60834 standards for digital transmission.
NOTE
i
i
The Ethernet line interface will prolong the digital transmission time for about 2 ms.

RM Transmission

2.12.4
Remote monitoring (RM) provides the possibility for the user to configure far end SWT 3000 in the communi-
cation link via PowerSys. RM transmission via Ethernet line interface is much faster than the existing analog
(50 bps) and digital (50 bps to 300 bps) line interface, which depends on the bandwidth of the Ethernet
channel. For every outgoing RM message, the keyed-hash message authentication is appended similar to the
command packet. The receiving SWT 3000 authenticates the RM message integrity and drops it if the message
is corrupted.
Figure 2-26 shows the example RM connection for 4 SWT 3000.
[DwRMTrans-28032014-1, 1, --_--]
Figure 2-26
For further information about Remote monitoring, refer to the Equipment Manual SWT 3000.
NOTE
i i
The Service Channel (SC) is not available on the Ethernet line interface.
2.12.5

Line Clock Synchronization

The line clock synchronization between 2 SWT 3000 devices is possible over Ethernet transmission line as well.
The Master SWT 3000 sends a line synchronization command to the slave SWT 3000 at a configured time
every 24 hours.
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020
Guard
Command
Command guard
Command transmission
Interval
RM Transmission
Functional Description
2.12 Tele Protection Over Packet TPoP
83