9
RA
Remote Alarm. A red LED indicating that the remote unit has encounter a fault condition
and has set the “Yellow Alarm bit” in the IEEE C37.94 protocol.
LA
Local Alarm. A red LED indicating that the 21-216 has encounter a fault in the received IEEE
C37.94 protocol – LOS Loss Of Signal. The “Yellow Alarm bit” is set in the outgoing IEEE
C37.94 protocol.
ERR
Error. A red LED indicating that the 21-216 has detected an internal error.
LF
Link Fiber. A green LED indicating that the 21-216 receives correct IEEE C37.94 frames, (no
LOS).
LT
Link Twisted pair/G.703 codir. A green LED indicating that 21-216 receives G.703 codir
64kbit/s protocol.
RxF
Receives data on fiber. A green LED indicating that 21-216 receives data in IEEE C37.94
format.
RxT
Receives data on Twisted pair/G.703 codir. A green LED indicating that 21-216 receives
data in G.703 codir protocol.
PSU2 (Optional second power supply)
A green LED lit when power is connected to the unit.
Alarm
Alarm out, is a 3-pin relay output. Normally when the G.703 link is up and the C37.04 link
is up and no errors, the NC pin and the common pin(in the middle) are closed, at the
same time the NO pin are open.
When G.703 link is down or C37.94 link is down or any other error is detected the relay
will switch to the opposite state.
Max switching voltage 440VAC, 300VDC.
Max switching current 8 A.
