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ZeroMQ input not usable in SFN #6

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mpbraendli opened this issue Aug 9, 2014 · 3 comments
Closed

ZeroMQ input not usable in SFN #6

mpbraendli opened this issue Aug 9, 2014 · 3 comments
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@mpbraendli
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The assembly of ETI frames into transmission frames is not checked for alignment contiuously. It is only checked once at startup. This is why when using the ZeroMQ input, a zmq message must contain four ETI frames, so that this alignment is never disturbed.

But in an scenario with timestamped transmission, once the modulator is streaming, it is expected that no incoming ETI frames get dropped. However, ZeroMQ doesn't guarantee that all frames reach the modulator. If we only lose a few, and the buffer is still large enough to sustain streaming, the UHD output will not interrupt, and the system will be transmitting timestamped frames at the wrong point in time.

This breaks the SFN feature.
@mpbraendli mpbraendli added the bug label Aug 9, 2014
@mpbraendli mpbraendli self-assigned this Aug 9, 2014
mpbraendli added a commit that referenced this issue Sep 13, 2014
@mpbraendli
SFN: carry FCT along with timestamps
6850954 
This is the first step to fix issue #6.

The goal is to enable the OutputUHD to check
for FCT consistency. Once it can do that,
it will also be able to reset the UHD streamer if
necessary.
@mpbraendli
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Commit 11295ea closes this bug.

@ghost
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ghost commented Sep 26, 2014

OH WOW!

Congratulations!

=)

On 26 September 2014 10:29, Matthias P. Braendli notifications@github.com
wrote:

Closed #6 #6.

—
Reply to this email directly or view it on GitHub
#6 (comment).

@mpbraendli
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Thanks !
But this bugfix doesn't imply that SFN is the most stable feature the mmbTools offers. ;-) Testing reports are welcome !

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