By PURPLELEC | 08 January 2024 | 0 Comments
Interfering snowflakes appear on the HDMI optical monitor screen
This situation is mostly caused by excessive attenuation of the optical fiber link or AC electromagnetic interference caused by the front-end video cable being too long.
1: Check whether the pigtail is excessively bent (especially during multi-mode transmission, try to stretch the pigtail and avoid excessive bending). 2: Check whether the connection between the optical port and the terminal box flange is reliable and whether the flange core is damaged, etc. 3: If the optical port and pigtail are too dirty, clean them with alcohol and cotton and wait until they are dry before inserting them. 4: When laying lines, try to use 75-5 cables with good shielding and good transmission quality for video transmission cables, and try to avoid AC lines and other objects that can easily cause electromagnetic interference.
There is no control signal or the control signal is abnormal.
Check whether the data signal indicator light of the optical transceiver is correct.
a: Check whether the data cable is connected correctly, firmly and reliably according to the data port definition in the product manual. Especially whether the positive and negative poles of the control wire are reversed.
b: Check whether the control data signal format sent by the control device (computer, keyboard or DVR, etc.) is consistent with the data format supported by the optical transceiver, and whether the baud rate exceeds the range supported by the optical transceiver (0-100Kbps).
c: Check whether the data cable is connected correctly, firmly and reliably according to the data port definition in the product manual. Especially whether the positive and negative poles of the control line are connected reversely.
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