Huawei EchoLife HG8110 Service Manual page 288

EchoLife HG8010/HG8110/HG8240/HG8245/HG8247/
HG8447 GPON Terminal
Service Manual
input optical port and can display the optical power of three wavelengths: 1310 nm, 1490 nm,
and 1550 nm.
Figure 4-3
Figure 4-3 Measurement points of the optical power in the GPON network
Maintenance engineers should also know related optical specifications on the ONT side, such
as the maximum output optical power of the 1310 nm wavelength, minimum input optical power
of the 1490 nm wavelength, and receiver sensitivity of the 1490 nm or 1550 nm wavelength.
Table 4-3
Table 4-3 Optical specifications of optical ports on GPON ONTs
Parameter
Type
Upstream data
Downstream
data
Downstream
CATV
To use an optical power meter, do as follows:
1.
2.
3.
4.
Figure 4-4
Issue 02 (2011-12-08)
shows the common measurement points.
lists the optical specifications on the ONT side.
Wavelength
(nm)
1310
1490
1550
Connect optical fibers to optical ports correctly in upstream and downstream directions.
Turn on the power supply.
Choose the measurement unit (dB or dBm).
Perform the measurement.
shows the measurement interface of the optical power meter.
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4 Maintenance and Troubleshooting
Unit Min.
dBm +0.5
dBm -28
dBm -8
Max.
+5
-8
+2
280