Transmission Concept
On the DLE, a data stream is generated at the transmit side from the protection commands, RM, SC, and the
system-internal control information. The data stream is sent with the periodic transmission of 4 message types
with constant length. The data stream is split up again at the receive side into protection commands, RM, SC,
and system-internal control information.
The messages have the following elements:
Priority 1 = Tripping command
information
Type 3
Priority 2 = Service channel
Type 2
Priority 3 = Remote mainte-
nance
Type 1
Priority 4 = System-internal
control information
Type 0
Table 9-1
Composition of Messages
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Frame alignment signal
Type code 0
User data
User data
User data
Frame alignment signal
Type code 1
RM data
RM data
RM data
Frame alignment signal
Type code 2
SC data
SC data
SC data
Frame alignment signal
Type code 3
Device address
Command informa-
tion
Checksum
9.2
Digital Line Equipment
9.2 Transmission Concept
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
333
C53000-G6040-C605-1, Edition 03.2020
