Ups Communication Signals; Figure 19. Upstream Test Configuration; Table 13. Ups Communication Signal Descriptions - ADTRAN Total Access 372E Installation And Maintenance Manual

3. Connect the test equipment to the optical fiber drop cable and the optical bulkhead on
4. Verify the test equipment measurement results are within the optical signal level range
5. If the measurement results are within range, perform a verification of the provisioning of
6. If the measurement results are not within range, perform a verification of the

UPS Communication Signals

The communication signals of the UPS are isolated from the internal circuitry via open
collector opto-coupled transistors. The connection SIG RTN (Signal Return) is a common
return point for all communication signals. In the typical application, the attached equipment
digital ground connects to Signal Return, and pull-up resistors turn the open collector signals
into logic levels.
A pinout of the communication signals is shown in
Signal
+12 VDC
12 V RTN
SIGNAL RETURN
ON BATTERY
REPLACE BATTERY
BATTERY MISSING
LOW BATTERY
61287723G1-5B
the SBU ONT using a test jumper as shown in
1490 nm
Drop cable

Figure 19. Upstream Test Configuration

described in Table 12 on page 38.
the SBU ONT at the OLT and verify that the proper upstream signal level is being
received by the OLT.
provisioning of the SBU ONT at the OLT. If after verifying the provisioning the problem
still exists, replace the SBU ONT.

Table 13. UPS Communication Signal Descriptions

Figure 19
OPM
or
OLTS
Table 13.
Description
Vo+ (+ Voltage output)
Return path for +12 VDC
Signal return
Low when operating from utility line
Open when operating from battery
Low when battery is charged
Open when battery fails self-test
Low when battery is present
Open when battery is missing
Low when battery is near full charge capacity
Open when operating from a battery with less than 20% capacity
Troubleshooting
on page 39.
1310 nm
Test jumper
ONT
39