Upstream Signal Level Verification; Figure 32. Downstream Test Configuration - ADTRAN Total Access 300 Installation And Maintenance Practice

To verify the correct downstream optical signal levels are present:
1. Ensure all connectors are clean and dry. Refer to
nents" on page 51 for details.
2. Setup and calibrate the OPM or OLTS for wavelengths that apply to FTT transmissions
(that is, 1310 nm and 1490 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.
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
described in Table
5. Do one of the following:
• 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
Level Verification"

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 ONT will not activate its laser without receiving a signal from
the OLT.
61187602G2-5A
:

Figure 32. Downstream Test Configuration

5.
on page 53.
"Cleaning and Inspection of Compo-
1490 nm
Drop Cable
OPM or
OLTS
NOTE
Installation
Figure 32.
"Upstream Signal
53