[USRP-users] Re: UHD routable through port forwarding?

[Marcus Müller]

Note that it's rather important that your router does not reorder packets; I think UHD for 
the most of its existence wasn't able to put incorrectly ordered packets back, and even if 
it can, it comes with an inherent latency and CPU load – both things you need to avoid.


Also: You might have a gigabit Internet line, but don't forget that even a mediocre 10 
MS/s stream from your USRP means a *constant* load of 320 Mb/s. I know no residential ISP 
who would guarantee that for any duration of time! University/Research institute access 
might be different, but even then, you would probably want to give your network operation 
team a bit of a heads up and let them have input on your problem; it's thoroughly possible 
that you end up getting a NAT-free VLAN connecting the two ends of your experiment if your 
uni's team is as cool as mine.


Best regards,
Marcus

On 17.12.22 04:08, Marcus D. Leech wrote:

On 16/12/2022 21:28, Louis Brown via USRP-users wrote:
I have an X300 and N210 I’d like to access through my firewall via a UHD based app.  Is 
this possible, and which port should I forward?


Thanks,
Lou
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We don't recommend using USRPs through routers -- they have a de-minimis IP routing 
stack in them, and should be thought
  of more as a hardware device that happens to use ethernet as a "device bus" than a 
first-class IP host.


There are also both performance and reliability issues--the protocols used are UDP 
based, and they don't have any
  retransmit capability, so cannot handle packet-loss that is inevitable on multi-hop 
routed connections.


That said, the UDP ports involved at 49152 and 49153 as I recall.

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[USRP-users] RFNoC Block Controller with Fractional Sample Rates

[Brian Padalino]

I am building some blocks that have some fractional rates for filtering,
and I am trying to make sure I convey the fractional rates correctly on the
controller block side.

I am looking at the ddc_block_control.cpp as an example, but it has a few
different functions:

  - get/set_input_rate
  - get/set_output_rate

... but those seem to rely on a property called _samp_rate_in which is
added in the private method _register_props() which also seems to add new
resolvers.

In other words, this is pretty complicated and I am unsure if I really need
this for a static fractional rate.

Is there any guidance on the UHD block controller side for an RFNoC block
for fixed fractional rate changes?

Thanks,
Brian
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