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robertalbertsen
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Join Date: Apr 2026
Posts: 1

HD-SDI Over Fiber Not Locking on Receiver Side

04/03/2026 11:52 PM

Hey everybody,

Running the QuestTel L-1SDI-FE-TX/RX feeding into a Blackmagic Smart Videohub 40x40 on a transit site, 8km singlemode, fiber tested clean. TX laser LED is solid, RX lock LED keeps flickering. 1080i/60 source, ST/PC connectors, 12V both sides, polarity verified.

Source is fine over coax direct. Anyone seen this before?
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Pathfinder Tags: fiber extender fiber optic HD-SDI RS485 SDI over fiber video transmission
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32201
Good Answers: 839
#1

Re: HD-SDI Over Fiber Not Locking on Receiver Side

09/10/2026 4:39 PM

Yes. The original equipment manufacturer may well have seen this with other Customers.

Please let the forum know the outcome of the telephone call.

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