21-08-2023, 07:55 AM
(20-08-2023, 02:20 PM)Stooky Bill Wrote: The source that says 'no signal detected' is a satellite receiver/decoder, the colour bars are from SIS, looks like some sort of decoder (and interesting spelling of 'media'). Both of those will either be synchronised into the building, or a local device so end up on air as proper good video, there'll be no loss of signal into the TX chain and it won't try and switch paths.
The 'no signal detected' screen is indeed a satellite decoder (probably the venerable Ericsson/MediaKind RX8200). The flashes of green are probably brief bits of it outputting invalid SDI video before it noticed and put out the error message instead.
The SIS 'Meida City' bars are actually generated by an encoder (providing a link from Salford to ITV's contribution network, possibly via BT Tower), and pop up on a loss of input. SIS, now NEP Connect, have a downlink station there.
So I think what happened was:
- RF stage loses signal
- Video decoder loses lock, then holds on to the last frame, then outputs black, then a few seconds of no valid video
- IVNP encoder pops up its bars
- Sat decoder starts outputting valid SDI black, which IVNP encoder starts sending again
- Sat decoder outputs signal loss message
- playout director cuts to the reserve, possibly not noticing that it's also on a glitchy freeze frame
- Playout director reaches for their breakdown slide and standby material.