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Total Access 374 4-POTS, 4-GigE MDU ONT Installation and Maintenance Guide
Signal Level Verification
The following sections detail signal level verification if problems are encountered when
service activation of an installed ONT is performed. Both
cation"
Downstream Signal Level Verification
A valid optical power level delivered by the OLT must be received at the drop cable point to
assure proper ONT ranging and operation. There is one optical wavelength (1490 nm) to
consider in the downstream direction that will contribute to the absolute optical power level
delivered to the ONT.
The 1490 nm wavelength is used for digital data. The individual optical power level that
should be present at the optical fiber that is connected to the ONT are listed in
To verify the correct downstream optical signal levels are present:
1. Ensure all connectors are clean and dry. Refer to
2. Setup and calibrate the OPM or OLTS for wavelengths that apply to FTT transmissions
3. Connect optical fiber drop cable to the test equipment as shown in
4. Verify the test equipment measurement results are within the optical signal level ranges
3-10
below and
"Upstream Signal Level Verification"
Table 3-4. Downstream Power Level
Optical Wavelength
1490 nm (digital)
nents"
on page 3-6 for details.
(that is 1310 nm and 1490). Verify the test equipment is capable and setup for wavelength
filtering so that you do not obtain an undesired reading of the absolute optical power
from all contributing wavelengths. Instead you are trying to measure the individual
wavelength optical power levels.
Figure 3-1. Downstream Test Configuration
described in
Table 3-4
above.
"Downstream Signal Level Verifi-
on page 3-11 are discussed.
Minimum Power Level
–27.0 dBm
"Cleaning and Inspection of Compo-
1490 nm
1550 nm
Drop cable
Table
3-4.
Maximum
–8.0 dBm
Figure
3-1.
OPM
or
OLTS
61287703G1-5B
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Troubleshooting
