LHMI info Description
Setting/signal Normal
(example)
Faulty
(example)
Specification
CRCERROR 0 1 Status CRC error in incoming message
TRDELERR 0 1 Status Transmission delay error, > 40 ms
SYNCERR 0 1 Status Error in echo timing synchronization
REMBLKDF 0 1 Status Error in received message at remote
end
GPSERROR 0 1 Status Error in GPS synchronization at
local or remote end
NOCARR 0 1 Status No carrier is detected in the
incoming message. Group signal -
Logical OR for:
• LINK_LOST (no input data
stream at the optical receiver)
• SYNC_LOST (clock
synchronization is lost)
• C37 ERROR (error at the
C37.94 fiberoptic receiver:
faulty format)
NOMESS 0 1 Status No start and stop flags in the
incoming message
LNGTHERR 0 1 Status Incorrect length for the incoming
message
YBIT 0 1 Status Detected error in an incoming
message at the remote end
LOWLEVEL 0 1 Status Low signal level in the receive link
1) Approximately 75% RXD is typical if, for example, two master clocks are present in the
telecommunication network.
5.6.2 Detecting communication faults on transceiver 21-216
GUID-A0B9019C-F470-49AA-AD36-56B1FCCB5E01 v1
Some LED indicators on the transceiver 21–216 front panel can be used for
communication fault tracing as shown in Table 29.
Table 29: LED indicators used for detecting communication faults
LED name
Fault indication
RA Remote Alarm. Red LED indicates that the remote unit has detected a fault
condition, and has set the Yellow Alarm bit in the C37.94 protocol.
LA Local Alarm. Red LED indicates that transceiver 21-206 has detected a fault
condition in the C37.94 protocol (LOS = Loss Of Signal). The Yellow Alarm bit is
set in the outgoing C37.94 protocol.
If the line differential protection IED shows a communication fail alarm but RA or
LA LED is not lit on transceiver 21-216, communication interruption stems from
the telecommunication network.
Section 5 1MRK 505 382-UEN B
Communication set-up
98 Communication set-up 670/650 series 2.2
Application Guide
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