Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-31
CM
6.1.4.6 P591 optical received signal level
With an optical cable connected to the P54x optical transmitter as instructed in section 6.1.2,
discon
nect the other end of the cable from the P591 receiver (RX) and use an optical power
meter to measure the received signal strength. The value should be in the range
-16.8 dBm to -25.4 dBm. Record the measured value and replace the connector to the P591
receiver.
6.1.4.7 P591 Loopback
It is nece
ssary to loop the transmitted electrical G.703 signal presented on terminals 3 and 4
of the P591 to the received signal presented on terminals 7 and 8. If test links have been
designed into the scheme to facilitate this they should be used. Alternatively, remove any
external wiring from terminals 3, 4, 7 and 8 at the rear of each P591 unit. Loopback the
G.703 signals on each unit by connecting a wire link between terminals 3 and 7, and a
second wire between terminals 4 and 8.
6.1.4.8 P591 optical transmitter signal level
Usi
ng an appropriate fiber optic cable, connect the optical transmitter (TX) to an optical
power meter. Check that the average power transmitted is within the range -16.8 dBm to
-22.8 dBm.
Record the transmit power level.
Connect the appropriate optical fiber to connect the P591 transmitter to the P54x optical
receiver and return to the P54x relay.
6.1.4.9 P54x optical received signal level from P591
Return to the P54x relay.
Disconnect the fiber from the P54x optical receiver that connects
to the optical transmitter of the P591 and measure the received signal level. The value
should be in the range -16.8 dBm to -25.4 dBm. Record the measurement and then
reconnect the fiber to the optical receiver.
6.1.5 Communications using P592 interface units (V.35)
Before loo
pback testing can begin, some other checks must be completed.
6.1.5.1 P592 visual inspection
Carefully examine the unit to see that no
physical damage has occurred since installation.
The rating information given under the top access cover on the front of the unit should be
checked to ensure it is correct for the particular installation.
Ensure that the case earthing connection, top left-hand corner at the rear of the case, is
used to connect the unit to a local earth bar using an adequate conductor.
6.1.5.2 P592 insulation
I
nsulation resistance tests are only necessary during commissioning if it is required for them
to be done and they haven’t been performed during installation.
Isolate all wiring from the earth and test the insulation with an electronic or brushless
insulation tester at a dc voltage not exceeding 500 V. The auxiliary dc supply terminals
should be temporarily connected together.
The V.35 circuits of the P592 are isolated from all other circuits but are electrically
connected to the outer case. The circuits must not therefore be insulation or impulse
tested to the case.
The insulation resistance should be greater than 100 M at 500 V.
On completion of the insulation resistance tests, ensure all external wiring is correctly
reconnected to the P592.
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