ONT Video LOS

Description

Generated when the video (including head-end failures) fails at the 1550nm wave length and there is no video signal incoming to an ONT.

Electrostatic Discharge (ESD)

Observe and follow all ESD instructions while handling Tellabs plug-in equipment.

Caution! The Tellabs plug-in equipment uses semiconductor devices that can be damaged by electrostatic discharge (ESD). Do not remove a plug-in from a protective packing box or equipment rack until the time of installation or replacement. To equalize the static charge on the plug-in, establish a body path to the ground using an ESD wrist strap connected to a ESD ground. If storing or shipping the plug-in becomes necessary, place the plug-in in a conductive shipping box to prevent static buildup.]

Apply the following precautions:

• Use grounded wrist straps, table mats, floor mats
• Handle static-sensitive devices by the nonconductive areas
• Place static-sensitive cards into an antistatic plastic bag
• Use protective ESD-sensitive packing and shipping bags, when returning repairable components

Laser Safety

Warning! Personnel handling fiber optic cables must be trained for laser safety.

Warning! Optical Fibers emit invisible laser radiation. Avoid direct exposure to the beam. Never look into the end of a Fiber or into a Fiber connector on a cable or a device. Permanent eye damage or blindness can occur quickly from laser radiation.

Fiber Optic Cable

Ensure that the fiber connectors are properly cleaned per local standards. Dirty connectors may result in inaccurate measurements.

Caution: Fiber optic cable installation and maintenance should only be performed by trained service personnel.

Caution:  Do not bend the fiber optic cable to a diameter smaller than 7.5cm/3 inches. Doing so may damage the fiber or prevent the signal from passing through properly.

Trouble Clearing

The probable causes of this alarm are: 

• Head-end not Transmitting: Verify the video head-end is transmitting the video signal and that the signal is at the PON in the Optical Line Terminal (OLT). If the head-end video signal is reaching the PON card in the OLT, this isolates the trouble from the PON card in the OLT to the ONT. If not, then the trouble is upstream of the PON.
  • Using an optical power meter or Optical Time Domain Reflectometer (OTDR), at the PON check for the 1550nm optical signal to verify it is being received. If the video signal is present at the PON, then the trouble is downstream of the PON. If the video signal is not at the PON, this indicates the trouble is upstream of the PON.
  • Using an optical power meter or OTDR, at the Splitter check for the 1550nm optical signal to verify it is being received. If the video signal is present at the Splitter, then the trouble is downstream of the Splitter. If the video signal is not present at the Splitter, then this would indicate a problem between the PON and the Splitter.
• Problem with Jumper: A common problem is the jumper between the video head end and the PON splitter combiner. This should be examined to ensure that the fiber is good and properly seated.
• Fibers and connectors at the PON and Splitter: Verify there are not any broken or damaged fibers at the PON and at the Splitter. Clean the connectors and fully seat all connectors at the PON and at the Splitter.
• Commercial power failure: At the EMS, check for a commercial PowerFailure or lowBatteryThreshold alarm. This indicates there has been a commercial power failure at the subscriber and the ONT is on battery backup. If this is the case, the ONT disables the video after 15 minutes and does not restore it until commercial power has been restored.
• ONT Problem: It is possible that the ONT Video hardware has a problem. If the signal level on the fiber at the input to the ONT is within specifications, and the connectors are properly seated, the ONT should be replaced.