CANOGA PERKINS 9119 Rack Mount 100BASE-TX/FX Media Converter - Manual (Page 21)

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9119 Media Converter Canoga Perkins
4. Troubleshooting
In the case of the 9119 Media Converter, a hybrid device, there are two LNK LED indicators, marked Fiber LNK and UTP
LNK. When the 9119 Media Converter is put into service, and if all cables are correctly connected and there are UTP and fiber
optic devices attached to the cable, both LNK indicators should illuminate. If either LNK Indicator does not illuminate, check
the appropriate attached cable and remote transmitter to ensure they are connected properly. If the UTP LNK Indicator still
does not illuminate, try the alternate UTP connector, which provides the opposite Transmit-to-Receive crossover routing.
This implies that if the LNK indicator is illuminated on the local device, the remote transmitter, the attached cable and the
local receiver are operational. In addition, the 9119 Media Converter supports Far End Fault operation on the Fiber Optic
interface, if connected to a unit with similar capability at the remote end. Thus, if the RMTF LED indicator is illuminated, it
indicates a problem with either the local fiber transmitter, the attached cable, or the remote fiber receiver.
The 9119 Media Converter's Link Loss Forwarding (LLF) feature will disable the UTP transmitter whenever the Fiber LNK
LED indicator is off. This allows the fiber failure to be sensed by a management agent at the remote UTP port as a UTP Link
failure. Therefore, whenever the UTP transmitter appears to be off, check the receive fiber cable connections to the 9119
media converter and ensure the F/LNK LED indicator is illuminated.
If the Power LED indicator and both LNK indicators are illuminated, and the RMTF indicator is off, you can assume with
some assurance that the problem exists elsewhere. Data transfer through the 9119 Media Converter can only take place
when both LNK indicators are illuminated and the RMTF indicator is off. The most common cause of network problems,
once physical layer problems are resolved, is software configurations.
In addition, check that the total link loss is within the allowable fiber optic loss budget, and that the proposed application
is within normal IEEE 802.3 Propagation Delay Budget parameters for Half-Duplex (CSMA/CD) applications.
If this still does not solve the problem, call the Canoga Perkins Service Department at (818) 718-6300. A 24-hour hotline,
(800) 360-6642, is available for emergency repair situations.