[App_rpt-users] Fwd: RE: Jim and Ramesh (chan_voter and RPi)

[Shane Morris]

---------- Forwarded message ----------
From: "Shane Morris" <edgecomberts at gmail.com>
Date: 28/12/2012 10:25 AM
Subject: RE: [App_rpt-users] Jim and Ramesh (chan_voter and RPi)
To: "Corey Dean" <n3fe at repeater.net>

Yes, but that function is handled by the DSPiC in the RTCM as far as I
understand. I'm suggesting the RPi be a SIP/ IAX server. And merely that.
No real need for a DSP in the RPi.
On 28/12/2012 10:22 AM, "Corey Dean" <n3fe at repeater.net> wrote:

> My thought on this would be if it couldn't handle the DSP and had to rely
> on simple USB then it wouldn't be able to work as a voter because it
> wouldn't be able to read the RSSI of the discriminator audio.   I may be
> way off on my thought, but I know it needs DSP for the discriminator audio.
>
> Corey  N3FE
>
> -----Original Message-----
> From: app_rpt-users-bounces at ohnosec.org [mailto:
> app_rpt-users-bounces at ohnosec.org] On Behalf Of Shane Morris
> Sent: Thursday, December 27, 2012 2:56 PM
> To: app_rpt mailing list
> Subject: [App_rpt-users] Jim and Ramesh (chan_voter and RPi)
>
> Hi all,
>
> I was thinking, even though the RaspberryPi can't handle the audio stream
> from a URI due to the limitations of the USB bus, what is the ethernet
> performance like? I imagine it wouldn't be terribly good, due to the fact
> the ethernet swings off the USB, but hear me out...
>
> chan_voter is a module that communicates via ethernet, am I correct?
> It uses an RTCM connected over an ethernet bus to communicate the voice
> data around, and I can imagine, at a low codec rate like GSM or even Speex,
> throughput wouldn't be as excessive as raw sound data coming from a fob.
>
> So my proposal is, before Jim and Ramesh throw out the baby with the
> bathwater, and consign the RPi effort to the dust, why not take the work,
> which I believe involves getting Zaptel/ DAHDI to work with the RPi, and
> apply it to a purely chan_voter system? Yes, I know the chan_voter is
> dependant upon app_rpt, and in the future, someone, somewhere, is going to
> try to hook up a sound fob, and miserably complain it doesn't work, but we
> get the same questions about Asterisk
> 1.8 over and over too, right?
>
> The advantages here are manyfold - again, low power consumption comes into
> the game, everyone knows I personally need as low a power consumption as I
> can get. The fact the RTCM data (ie, VoIP over
> ethernet) is much more suited to the infrastructure on the RPi is a good
> thing here too. The fact that normal Asterisk just runs, and runs well, on
> RPi is another motivating factor - my friend Andrew is running his house
> PABX on an RPi running Asterisk 1.8 I believe, there is an image for this.
> And yes, simply the cool factor - who else can say they run their voting
> repeater system off something the size of a credit card, with all the
> proprietary, messy, rack mounted stuff out there?
>
> If Jim and Ramesh are unwilling, or unable, to help, due to the fact that
> the RPi is a bit of a letdown (I heard about the USB performance issues -
> ouch!), I would like to take their work, and apply it to a platform I think
> may have a bit better USB performance - its based on a Cortex-A8 (ARMv7) -
> the Cubieboard. For all you I/O junkies out there, what can YOU do with 96
> I/Os? For $49, gets you something good, look it up, www.cubieboard.org -
> I got one for Christmas, and I thought it would be good for this. Its a
> Chinese Allwinnner A10 device.
>
> Since I have gone beyond just simple URI systems since Jim introduced me
> to the RTCM, I would like to get this to work. I recognised the RTCM did
> something I was talking to Andrew about on the way home from Expedition in
> October of this year - "Wouldn't it be nice, Andrew, if we could have a
> voting system that allows us the flexibility to run an Expeditions
> communications in such a way that make it simply easy for us, and easy for
> the users?" Before, we've had users change channels in different places,
> this inevitably leads to confusion. With a chan_voter system, we can run
> the same UHF CB channel across the arena, and access it anywhere.
>
> Andrew had said to me "Shane, do you know how much such a system would
> cost...?" Yes, Andrew, I had the Simoco, and I bought the RTCM for
> $250 second hand ^.^ Sorry for being a smart-alec, I know you meant how
> much would a PROPRIETARY system cost us?
>
> Anyway, I hope I have Jim and Rameshes blessing on this one - they did
> some great work, and I know it must've been a letdown to find out the
> hardware simply wasn't up to the task. Believe me, this isn't the first
> story I've heard about the lacklustre I/O performance of the RPi, and it
> won't be the last. But by using their work on a much stronger (I hope!)
> platform that it still ARM Linux based, I hope to circumvent at least one
> problem with the RPi. And its only $11 more before shipping!
>
> Looks like I'm going to be reading the Allwinnner A10 device spec sheet
> now, huh? =)
>
> Thanks for putting up with my ramble everyone.
>
> Shane.
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