2 measuring receiver input power, Measuring receiver input power – CANOGA PERKINS 9145ELB Network Interface Device Hardware User Manual
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9145ELB NID Hardware User’s Manual
Maintenance
Checking Optical Power Levels
32
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.
5. If the reading is low, repeat the measurement with a different test cable. If the power level
is still not within range, call Canoga Perkins Technical Support.
Figure 6-1 Measuring Transmitter Output Power
6.2.2 Measuring Receiver Input Power
To measure receiver input power (
):
1. Connect the transmit fiber to the transmit side of the equipment at the local site.
2. Connect a calibrated optical power meter to the end of the transmit fiber at the remote
site.
3. Measure and record the optical power on the transmit fiber at the remote site. This is the
receiver input power for the transmit fiber from the local site.
4. Connect the transmit fiber to the transmit side of the equipment at the remote site.
5. Connect a calibrated optical power meter to the end of the transmit fiber at the local site.
6. Measure and record the optical power on the transmit fiber at the local site. This is the
receiver input power for the transmit fiber from the remote site.
7. Compare the receiver input power with the sensitivity level listed on the optical
specifications sheet, located in the Client Support Area of the Canoga Perkins web site.
The power level must be within the sensitivity range listed on the data sheet. If not,
contact Canoga Perkins Technical Support.
8. Compare the receiver input power to the receiver’s saturation (overdrive) level shown on
the optical specifications sheet, located in the Client Support Area of the Canoga Perkins
FIBER OPTIC
TRANSMITTER
FIBER OPTIC
RECEIVER
OPTICAL
POWER
METER
-7dBm
λ = 1300 nm