Troubleshooting
98
Instruction Manual – DXLink Fiber Transmitters and Receivers
DXLink Fiber Troubleshooting
Problem –
The signal run exhibits general signal problems, which may be caused by fiber cable quality issues.
Possible Solution –
Be sure to check the “Fiber Optic Cable Requirements” section on page 41.
Problem –
The signal run exhibits general audio problems, which may because you are trying to pass Dolby, DTS, or
high PCM frequency rates and the destination device does not support them.
Possible Solution –
Re-programming the EDID may help resolve the problem (see page 145).
Problem –
The signal run exhibits general video problems, which may be because you are trying to pass a video format
that the destination device does not support.
Possible Solution #1 –
Re-programming the EDID may help resolve the problem (see page 145).
Possible Solution #2 –
Check the Scaling setting on the RX unit to ensure it is in either Auto or Manual Mode (see
page 61).
Problem –
You are unsure if a multimode transceiver is passing an optical signal downstream.
Possible Solution –
Disconnect the fiber optic cable from the destination unit or board and, holding the cable away from
you, take a picture of the end with a digital camera (or cell phone camera). The image will show a bright light if the
signal is being passed (works on most digital cameras and cell phone cameras).
Problem –
You are unsure that Duplex hardware (in Bidirectional Mode)* is passing data over fiber.
Possible Solution –
Verify that the unit’s LED activity conforms to expected behavior:
– Yellow LED: fast blink = unencrypted video present
– Yellow LED: slow blink = free-run video present**
– Yellow LED: solid = HDCP video present
– Green LED: solid = full bidirectional link established
– Green LED: off = link not established
– Green LED: blinking = Data Link-lost Mode*** (no Ethernet, RS-232, IR, or USB). If Bidirectional Mode is required,
check return fiber path for proper connections and make sure DIP switch Toggle #4 is OFF.
Problem –
You are unsure that Simplex hardware* is passing audio and video over fiber.
Possible Solution –
Verify that the unit’s LED activity conforms to expected behavior:
– Illuminated LED: solid = available for use; not sending audio and video (never present: Ethernet, RS-232, IR, or USB)
– Illuminated LED: blinking = receiving or transmitting audio and video (never present: Ethernet, RS-232, IR, or USB)
* With Simplex hardware or when Duplex hardware is in Unidirectional Mode, only one LED operates, either the TX
LED or the RX LED. The operational LED illuminates on the side of the transceiver where data enters or leaves the
hardware and indicates the individual port where the fiber optic cable should be attached during cabling.
** Free run video is a video mode internal to the DXLink system. When free run video is indicated, video is not
displayed (nor is black video present) out the endpoint RX. This identifies a good connection with video flow between
endpoints.
*** When a DXLink Fiber Duplex cable run in Bidirectional Mode has one or both of the fiber optic cables on the return
path removed, the system automatically enters Data Link-lost Mode. In Data Link-lost Mode, video and audio continue
to flow from source to destination, but network and control no longer transmit over the fiber optic path.
