CANOGA PERKINS 9161 Network Interface Device - Manual (Page 49)

Maintenance 9161 Ethernet Network Interface Device User’s Manual
General Maintenance
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5.1 General Maintenance
Well maintained components and clearly identified cables help assure optimum system opera-
tion. Damaged fiber optic cables and dirty connectors are a common source of signal loss or
attenuation. Fiber optics are especially susceptible to contamination. Inspect, clean, and test all
components to maintain optimum performance. Inspect the surface of the fiber optic ferrules and
clean as required.
CAUTION: To avoid damage and signal loss, do not over-tighten or force-
fit optical connectors.
5.2 Check Optical Power Levels
NOTE: For accurate results, warm up each unit for at least 30 minutes before
checking power levels. Ensure the Transmit laser is turned on when
the unit is powered up.
To ensure proper performance levels, measure Transmitter Output Power, Receiver Input Power,
and attenuation for all fiber links. Each 9161 is shipped with a document that lists the output
power for each optical transceiver.
5.2.1 Measuring Transmitter Output Power
To measure the output power, follow these steps (see Figure 6-1):
1. Inspect and clean connectors on a fiber optic test cable with a known loss, then connect it
to the Tx connector on the 9161.
2. Set the optical power meter to the proper wavelength.
3. Connect the other end of the optic test cable to the optical power meter, wait two or three
minutes for the power reading to stabilize, and read the output power.
4. Add the test cable loss, then record the power level and compare it to the value on the
performance sheet that was included for that transceiver. Measurement tolerance is +/-
0.5 dBm.
Chapter 5
Maintenance