Upstream Signal Level Verification; Figure 26. Downstream Test Configuration; Table 12. Upstream Power Levels - ADTRAN Total Access 300 Series Installation And Maintenance Manual

Total Access 300 GigE SFU ONT with RF Overlay Installation and Maintenance Guide
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 Figure 26.
4. Verify the test equipment measurement results are within the optical signal level ranges
5. Do one of the following:

Upstream Signal Level Verification

A valid optical power level delivered by the ONT must be received by the OLT on the GPON
to assure proper ONT ranging and operation. The laser output of the ONT is burst mode at
1310 nm that is controlled in the upstream direction by grants given by the OLT.
The individual optical power level that should be present at the optical bulkhead that is
located on the ONT is listed in Table 12.
To verify the correct upstream optical signal level is present:
1.Ensure all connectors are clean and dry. Refer to the "Cleaning and Inspection of Compo‐
2. Setup and calibrate an OPM or OLTS that can be placed inline on the optical fiber and is
46
(that is, 1310 nm, 1490 and 1550 nm). 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 26. Downstream Test Configuration

described in Table 11 above.
• If the results are not within range, perform the necessary testing and verification steps to
validate points further up the network, towards the OLT, to locate the cause of the optical
signal level differences.
• If the measurement results are within range, perform the steps in "Upstream Signal Level
Verification" on page 46.
Optical Wavelength
1310 nm
nents" on page 44 for details.
capable of performing wavelength filtering in order to obtain individual wavelength
optical power level readings.
1550 nm
1490 nm
Drop cable

Table 12. Upstream Power Levels

Minimum Power Level
0 dBm
OPM
or
OLTS
Maximum Power Level
+5 dBm
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