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.
5.6.6 Service settings
GUID-4945ED6C-5CE7-4C32-8911-0D7057C11B0E v1
5.6.6.1 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).
IEC10000062 V1 EN-US
Figure 86: IED set as a slave
Section 5 1MRK505382-UEN Rev. K
Communication set-up
84 Communication set-up, 670/650 series
Application Guide
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