903-0628-00 Rev. 1
Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp.
Page 7-1
7.0 Troubleshooting
7.1 System Verification
7.1.1 Initial Checks
Ensure cards installed and configured as per installation drawing.
Ensure correct input power is supplied and verify the primary fuse is not open.
Fuses: each module and card have fuse protection. Ensure there are no input power supply issues or
incorrect connector wiring before replacing fuses. Several spare kits are available for fuses, e.g.
903-8022-18.
Verify the proper fuse type and value and location per the appendices sections in this User’s Guide.
Ensure voltage rail levels are acceptable using either the diagnostics software or a voltmeter.
Ensure external fibers and bushings are clean and have low optical loss. (May be verified with
diagnostic software or an optical power meter.)
Ensure optical output power levels are sufficient at the FMB front panels with an optical power meter:
o
Console FMB 1550 nm downlink output power should be -2 dBm or better and
o
Remote FMB 1310 nm uplink output power should be -6 dBm or better.
Ensure receiver power at the FMB front panel is acceptable, between -4 dBm and -24 dBm at remote
and between -7 dBm and -28 dBm at console. Excessive receive power will cause errors or possibly
even damage the receiver and low receive power will cause errors or link faults. In general, bench
testing should be conducted with a 10 dB optical attenuator.
7.1.2 Review Settings
Cards are shipped from the factory in the default configuration for the specific system. Shunt
terminals are 2-pin or 3-pin; pin 1 is typically designated with a square pad or silk-screened ‘1’.
DIP switches are set either on (1) or off (0). Circuit 1 is the leftmost switch when reading the text on
the switch.
Mode settings should generally match on remote and console cards, except AIB-MS900,
AIB-ARCNET, and AIB-HYDRO.
FMB DIP switch settings should not normally be changed. When troubleshooting an older card with a
DIP switch, switch the DIP switch back and forth a few times to ensure there is a good, stable
contact.
7.1.3 Using Diagnostic Software
Check for acceptable voltage levels (screen LEDs).
Check acceptable temperature, remote and console (both should be less than +70C).
Check for uplink/downlink errors (<= 1 error per hour typical).
Verify expected optical levels (transmitted and received) with fiber optic power meter.
Verify power budget with VOAT (Variable Optical Attenuator), refer to section 6.4 of this document for
a bench test example.
Observe strip chart for unusual power fluctuations in the optical link.
Verify losses of video sync.
Log diagnostics files for long term monitoring.
When new FMBs are installed, the software may need to be recalibrated for optical readings. (OK if
within 2 dB).
Summary of Contents for Focal 903
Page 78: ...903 0628 00 Rev 1 Model 903 HD User s Guide FMB X 2 5 This page intentionally left blank ...
Page 79: ...903 0628 00 Rev 1 Model 903 HD User s Guide FMB X 2 5 APPENDICES ...
Page 80: ...903 0628 00 Rev 1 Model 903 HD User s Guide FMB X 2 5 This page intentionally left blank ...
Page 86: ...903 0628 00 Rev 1 Model 903 HD User s Guide FMB X 2 5 This page intentionally left blank ...
Page 89: ...903 0628 00 Rev 1 Model 903 HD User s Guide FMB X 2 5 APPENDIX E BACKPLANE PIN CONFIGURATIONS ...
