ADTRAN 1287722G1, Руководство по установке и обслуживанию

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Total Access 372 Small Business Unit ONT Installation and Maintenance Guide
40 61287722G1-5B
• If the measurement results are within range, perform the steps in “Upstream Signal
Level Verification” on page 40.
Upstream Signal Level Verification
A valid optical power level delivered by the SBU ONT must be received by the OLT in 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 SBU 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 ‐
nents” on page 38 for details.
2. Setup and calibrate an OPM or OLTS that can be placed inline on the optical fiber and is
capable of performing wavelength filtering in order to obtain individual wavelength
optical power level readings.
3. Connect the test equipment to the optical fiber drop cable and the optical bulkhead on
the SBU ONT using a test jumper as shown in Figure 20 on page 40.
Figure 20. Upstream Test Configuration
4. Verify the test equipment measurement results are within the optical signal level range
described in Table 12 above.
5. If the measurement results are within range, perform a verification of the provisioning of
the SBU ONT at the OLT and verify that the proper upstream signal level is being
received by the OLT.
6. If the measurement results are not within range, perform a verification of the
provisioning of the SBU ONT at the OLT. If after verifying the provisioning the problem
still exists, replace the SBU ONT.
Table 12. Upstream Power Levels
Optical Wavelength Minimum Power Level Maximum Power Level
1310 nm 0 dBm +5 dBm
1310 nm
1490 nm
Test jumper Drop cable
OPM
or
OLTS ONT