Alstom MiCOM P545 - 6.1.1 Communications loopback setting; 6.1.1.1 Channel 1 transmit power level; 6.1.1.2 Channel 2 transmit power level; 6.1.2 Loopback communications configuration

Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-29
CM
6.1.1 Communications loopback setting
The loopback test can be used to establish correct operation of the local communication
interface.
In loopback mode the signals sent and received via the communications interface
continue to be routed to and from the signals defined in the programmable logic. If
InterMiCOM
64
is enabled, the same applies, but in this case, if the IM64 Test Mode is
set to ‘Enabled’, a test pattern, IM64 Test Pattern is transmitted instead. This can be
useful for testing.
Set cell [0F13 Test Loopback] to ‘External’.
6.1.1.1 Channel 1 transmit power level
Usi
ng an appropriate fiber optic cable, connect the Channel 1 transmitter (TX1) to an optical
power meter. Check that the average power transmitted is within the range given in the
following tables.
Relays
manufactured pre
April 2008
850 nm
multi-mode
1300 nm
multi-mode
1300 nm
single-mode
Maximum
transmitter power
(average value)
-19.8 dBm -7 dBm -7 dBm
Minimum
transmitter power
(average value)
-22.8 dBm -13 dBm -13 dBm
Relays
manufactured
post April 2008
850 nm
multi-mode
1300 nm
multi-mode
1300 nm
single-mode
Maximum
transmitter power
(average value)
-19.8 dBm -3 dBm -3 dBm
Minimum
transmitter power
(average value)
-22.8 dBm -9 dBm -9 dBm
Record the transmit power level.
6.1.1.2 Channel 2 transmit power level
Rep
eat section 6.1.1.1 for channel 2 (if fitted)
6.1.2 Loopback communications configuration
A commu
nications loopback will need to be made on the protection signaling
communications. Either one or two channels will be fitted according to specification. A
combination of direct fiber connection or multiplexed (using P59x units) connection can be
used on each of the channels. Sections 6.1.3 to 6.1.6 describe how the various loopback
are m
ade. They should be followed as appropriate to configure the loopback on channel 1
and the loopback on channel 2 (if fitted), before proceeding to the loopback test described in
section 6.1.7.
If the commu
nications is being realized using P590 interface units, then start by connecting
the appropriate optical fiber(s) between the channel transmitter(s) on the P54x that will be
used to make connection to the P590 optical receiver(s) and then proceed to the relevant
sections below that describe the commissioning of the P590 interface units.