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mpinto, bersanetti - 15:23 Tuesday 25 November 2025 (68244) Print this report
BS TX full bandwidth - local control glitches

today, profiting of the fact that we had to unlock in order to let Ilaria do her commissioning activity, we made few tests restoring the BS tx in full bandwidth. The first test didn't go well as concurrently with the loop engagement we had a huge drop of the BNS (not clear if the drop is related to some loop misbehaviour, since the decrease of the BNS seems to be started before the fbw engagement, fig.1).

The second test we had a similar drop after 60 seconds the fbw engagement, but this time the issue was caused by a glitch on the local control signals, both on tx and ty, see fig.2 and 3 for zoom. By looking at the zoom they look more like some missing samples.

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masserot, mours - 21:28 Tuesday 25 November 2025 (68250) Print this report

Some remarks related to this event 2025-11-25-13h36m42-UTC 

  • there is none log messages reported by the ISC_Fb server receiving the 59 Sc_BS's channels
  • all Sc_BS's channels are missing during 40.2ms (see the attached plots)

The file Sc_BS-1448113020-20251125-13h36m42-UTC.txt shows the content of one of the channels 

  • the first sample set to zero is the sample id 1517 
  • the last sample set to zeor is the sample id 1918

According the TolmFrameBuilder code,  if there is none log messages reported its means that all data were received.

As result, we think that all the Tolm packets from Sc_BS were received and some of them were sent with 0 for all channels by the Sc_BS DSP 

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