Cisco ONS 15200 Series, Инструкция по установке, настройке и эксплуатации

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4-15
Cisco ONS 15200 Installation, Setup, and Test Manual
78-13765-01
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.
Step 6 Attenuate the DWDM transmit port:
a.
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.
b. Record the B-side attenuated power level in Table B-14 on page B-7 .
c.
Insert the attenuated jumper into the B input port, as shown in Figure 4-6 .
d. Repeat Steps a – c on the A side. Record the A-side attenuated power level in Table B-14 on
page B-7 .
e.
Check the received power using the Maintenance Manager, and record the values in Table B-14 on
page B-7 .
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
Step 7
Double-click the data rate parameter in Maintenance Manager, and set the data rate to OC-48 (datarate
stm_16). Verify the data rate.
Step 8 Check the client side transmit levels.
a.
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.)
b. Run a jumper cable from the client OUT port of the CLIP to your power meter.
c.
Set the wavelength on the power meter to 1310 nm.
d. Measure and record the output power of the client side transmit in Table B-15 on page B-8 .
Step 9
Disconnect the power meter from the client side output and run a fiber from the client OUTPUT interface
to the receive of the signal generator.
Note
Do not remove any fibers.