LBVM920 Series 1.2 GHz Indoor High Output Optical Node
Installation & Operation Manual
TROUBLESHOOTING GUIDELINES
1.
No Power on the LBVM920 ONU.
a.
Check the powering coaxial cable and connections for intermittent connections.
b.
Check the output of the power adaptor for proper DC voltage (+29 VDC).
c.
Check with a different 29 VDC power pack.
d.
Try powering via the RF OUT/PWR IN port using a power inserter.
2.
Low or no downstream RF output level.
a.
Verify the optical receive level on the LBVM920 is within range (-8 dBm to 0 dBm, 3.5% OMI level and correct downstream wavelength).
b.
Using a fiber inspection scope, check the optical connector and adaptor. Make sure the optical connection is clean.
c.
If the optical input is within range, the OPT ON LED on the photo diode is illuminated. Verify that the OPT ON LED is illuminated. Use a DC voltage meter to
measure the 1 mW/1V OP TP on the photo diode of the ONU. Refer to step #13 and table under the OPTICAL, RF & POWER CONNECTIONS section of
this manual.
d.
Verify steps 2 to 8 under the FORWARD & REVERSE SETUP GUIDELINES of this manual for more troubleshooting.
e.
Check for intermittent connections or pinched fibers.
3.
Low or no upstream transmit level.
a.
Verify the LASER ON LED on the LBVM920 ONU is illuminated. Measure the OP TP 1V/1 mW DC TP on the laser diode using a digital multimeter on DC
voltage setting. Verify the DC voltage reading is as expected from table under the OPTICAL, RF & POWER CONNECTIONS section of this manual.
b.
Connect an optical power meter to the OPT OUT port. Using the optical power meter at proper upstream wavelength, verify the optical output of the
LBVM920 directly from OPT OUT port is ≥ 2.7 dBm.
c.
Verify the upstream RF input is within the LBVM920 upstream frequency range (5-42 MHz or 5-85 MHz) and level. Refer to reverse setup guidelines.
d.
Use a CW carrier for injection to troubleshoot.
e.
Inject either from the RF OUT port or using the bi-directional -20 dB forward TP. Make sure to compensate 20 dB if using the -20 dB TP to inject carrier.
f.
The RF input can also be verified at the reverse -20 dB TP.
g.
Check for intermittent connections.
4.
If the problem is still not solved, replace, and try with another node.
5.
If the problem still exists, contact Lindsay Broadband for support. Do not open the LBVM920 as it will void the warranty.
2-2035 Fisher Dr, Peterborough, ON K9J 6X6 Canada
+1.705.742.1350
•
1.800.465.7046
•
•
lindsaybb.com
© 2021 Lindsay Broadband Inc. All rights reserved. Printed in Canada. Non-Lindsay Broadband product marks,
service marks, and company names in this document are the property of their respective owners.
All information is subject to change without notice.
Rev. 07/21 (LBB0378)
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Page 4 of 4
ORDERING INFORMATION
# of Fibers
Laser
TX
TX
Sub-Split
Optical
Power
Type
Power
Wavelength
Connector
Adaptor
LBVM920
−
x
−
D
x
−
xx
−
xx
−
xx
−
x
S = Single (WDM)
D = DFB
2 = 2 mW
31 = 1310 nm
45 = 42/54
SA = SC/APC
1 = N. America
D = Dual (RX & TX fibers)
3 = 3 mW
47 = 1470 nm
81 = 85/102
2 = Europe
49 = 1490 nm
3 = Brazil
51 = 1510 nm
53 = 1530 nm
55 = 1550 nm
57 = 1570 nm
59 = 1590 nm
61 = 1610 nm
COMPLETING THE INSTALLATION
1.
Record the input and output levels for the station in both upstream and downstream for reference.
2.
Make sure the cables are routed properly and all connections are secured.
3.
Ensure the optical fiber cable is not pinched and does not have sharp bends.
FORWARD & REVERSE SETUP GUIDELINES CONT'D.
14.
For optimum performance in the upstream direction, make sure the LBVM920 is operated with RF input levels to the left side of the NPR peak. Operating at RF
input levels to the left side of the NPR peak will provide the best MER/BER performance while assuring the laser saturation and clipping does not occur on the laser
transmitter.
15.
This completes the reverse path setup for the LBVM920 ONU.
16.
If you have any more questions regarding the LBVM920 setup, please contact Lindsay Broadband for support.
Optional Accessories
Part #
Description
LBVM920GP-xdB
Plug-in attenuator (x = dB value; available values = 0, 2, 4, 6, 8, 10, 12, 14, 16)
