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Chapter 4
Turn Up and Test
Procedure: Check DWDM Receivers and Client Transmit Levels
Continue with the following steps to check DWDM receivers and client transmit levels.
Attenuate the DWDM transmit port:
Step 6
a.
b.
c.
d.
e.
To calculate the expected receive power, take the measured transmit power and subtract the associated
losses caused by the channel dropping. Actual received power should be within 2 dB of the expected
received power.
Formula:
ERp = MTp – 2
ERp—Expected received power
MTp—Measured transmitter power (with attenuators attached) on the OUT port of the SCU side in use
2—Value (in dB) that must be subtracted to account for the combined loss from the connectors and drop
in the CFM
Double-click the data rate parameter in Maintenance Manager, and set the data rate to OC-48 (datarate
Step 7
stm_16). Verify the data rate.
Check the client side transmit levels.
Step 8
a.
b.
c.
d.
Disconnect the power meter from the client side output and run a fiber from the client OUTPUT interface
Step 9
to the receive of the signal generator.
Note
78-13765-01
Attenuate the output port of the B-side of the SCU so that the optical power measured is within the
DWDM receiver specification for each wavelength. The receiver operating range is -31 and -8 dBm,
but the default warning thresholds of -28 and -10 should be used on all CLIP interfaces. As a rough
guide, the input power for each channel should be between -25 and -10 dBm.
Record the B-side attenuated power level in
Insert the attenuated jumper into the B input port, as shown in
Repeat Steps
a–c
on the A side. Record the A-side attenuated power level in
page
B-7.
Check the received power using the Maintenance Manager, and record the values in
page
B-7.
Connect a fiber from the transmit port of the signal generator to the client IN port for the CLIP. (The
valid input range on the client side receive is -3 to -18 dBm.)
Run a jumper cable from the client OUT port of the CLIP to your power meter.
Set the wavelength on the power meter to 1310 nm.
Measure and record the output power of the client side transmit in
Do not remove any fibers.
Table B-14 on page
B-7.
Figure
Table B-15 on page
Cisco ONS 15200 Installation, Setup, and Test Manual
4-6.
Table B-14 on
Table B-14 on
B-8.
4-15
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