2 Status LEDs for Channel 1
LED name LED function
LA Local Alarm. Red LED indicates that transceiver 21-219 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.
The red LED is lit when transceiver 21-219 has detected an error. The indication
has a memory function. When the local error is no longer present, the LED blinks
until the Reset button is pressed.
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.
The red LED is lit when the fibre-optic link has detected an error. The indication
has a memory function. When the remote error is no longer present, the LED
blinks until the Reset button is pressed.
ST
Status. The red LED is lit when transceiver 21–219 has set outgoing data on fibre-
to-AIS condition.
LI Link Fibre. Green LED indicates that transceiver 21-219 is receiving the correct
C37.94 frames (no LOS).
The LED blinks when the fibre-optic receiver indicates low signal amplitude
(received optical signal power between –35 dBm and –40 dbM). The C37.94
standard specifies that the receiver should operate error-free (BER <1E-9) when
the mean optical power is between -32 dBM and -11 dBm.
TxD
Received data from E1 sent to C37.94. Yellow LED indicates that transceiver
21-219 is sending data in C37.94 format.
RxD Receive data on fibre. Yellow LED indicates that transceiver 21-219 is receiving
data in C37.94 format.
5.5.6 Service settings
GUID-4945ED6C-5CE7-4C32-8911-0D7057C11B0E v1
5.5.6.1 Service settings for the line differential protection IED
GUID-5C96797C-B5CF-4E81-9DDB-02FF91492A90 v1
Line differential protection IEDs used in the communication set-up are set to
operate as slaves (CommSync = Slave).
Section 5 1MRK 505 382-UEN B
Communication set-up
92 Communication set-up 670/650 series 2.2
Application Guide
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