[arm-allstar] BBB/Pi or RTCM

Thu Nov 19 23:03:05 EST 2015

Wayne,

 The RTCM is not a stand-alone device. It requires a server (Acid, BBB, RPi2) running Allstar to function. The voting process uses the function of the RTCM AND the Allstar end to function. There is a channel driver in Allstar which functions with the RTCM.  Currently the voting process will not work stand-alone in the Acid PC, BBB, or RPi2 without the RTCM.

Voting requires synchronization of audio. If you have audio coming from several places via the Internet there is no guarantee that each audio channel would arrive at the same. The voting procedure obviously has to process and switch audio that is synchronized to be seamless. The RTCM time stamps the packets based on accurate GPS timing. The packets are then processed back at the server (Acid, BBB, RPi2) end.

I hope that answers your question. The RTCM manual should explain much of this and there is info out there you just have to google search for it.  Try   'asterisk app_rpt voter'

http://ohnosec.org/drupal/node/180

73 Doug
WA3DSP
http://www.crompton.com/hamradio

From: allstar at controlservers.net
To: arm-allstar at hamvoip.org
Date: Thu, 19 Nov 2015 18:55:54 -0800
Subject: Re: [arm-allstar] BBB/Pi or RTCM

I don’t drink coffee. It took me a few minutes to realize that there are 
two Sam’s. What you aren’t aware of is that I have several emails telling me 
offlist otherwise and therefore confusion. Suggesting that I don’t know how to, 
or I am not reading isn’t fair. I’m reall
y
 just a guy trying to learn and had 
hoped for more than RTFM. I don’t understand the answer. That’s all. There is a 
huge amount of information in this list that I don’t understand and much of it I 
dare say isn’t in the manual, They are things you guys have discovered. I don’t 
mean to sound condescending or patronizing. I just don’t understand!

If we can get back to my question, I have been told by offlist email that 
it is possible to use the RPi2 or the BBB for voting and simulcast but when 
reading the manuals I don’t see this information. I have asked for clarification 
because I really would like to know if there are benefits to doing so over the 
RTCM, which of course does voting. I’ll confess that I don’t communicate well 
using email. I try but I seem to miss the mark and I hope that you’ll help me 
with this.

From: Sam Skolfield 
Sent: Thursday, November 19, 2015 2:26 PM
To: ARM Allstar 
Subject: Re: [arm-allstar] BBB/Pi or RTCM

People have stated over and over throughout the thread that the RTCM is the 
only Allstar compatible device that votes and simulcasts. So asking if Sam if he 
is using a RTCM for simulcasting or not shows that either you aren't reading 
people's posts all the way through or you are in the first week of trying to 
kick a bad caffeine habit. Please don't feel victimized because people grow sick 
of repeating themselves. 

The documentation on the RTCMs and the voting mechanics of app_rpt is very 
well done, and answers all of your questions. Many newbies have deployed RTCM 
systems from design to finish with no help whatsoever from the group, so one 
would think that a system administrator would have much less of a problem 
grasping the basics.

On Nov 19, 2015, at 3:43 AM, R. Wayne <allstar at controlservers.net> 
wrote:

  It does, Sam. Thank you for taking the time to explain. I keep reading so 
  many different things and its like, OK, which way do I go.

Now you say 
  that you are using BBB located at one site. But am I to assume that for the 
  simulcast you are using the RTCM and they talk to your BBB? Our server is in a 
  commercial data center now but it doesn’t need to be. It could be a RPi2 at 
  one site and they would all talk one another. Our site vendor has 25 linked 
  sites. Doing this would lower the latency. I assume that we could then run a 
  remote base that could talk up to a site that allow other Allstar nodes into 
  the system using a different node number.

  Am I on the right track?

  From: Sam Nabkey 
  Sent: Thursday, November 19, 2015 3:09 AM
  To: BeagleBone Black ARM Allstar 
  Subject: Re: [arm-allstar] BBB/Pi or RTCM

  Consider the RTCM to be an ip phone. It will only talk to itself 
  without a pbx.  Allstar is rhe pbx.  
  The RTCM is a stupid controller without a connected server 
  Doesn't matter where or what allstar is running on, as long as one 
  the sites with the RTCM is located on the same physical switch as the allstar 
  server. That allows for proper GPS timing between the allstar server and the 
  master RTCM.   In some cases people don't run any radios on this 
  single RTCM.
  I use a bbb located at one of my sites and run a simulcast 900 
  repeater.   Work wonderful 
  Does that help?  
  On Nov 19, 2015 05:37, "R. Wayne" <allstar at controlservers.net> 
  wrote:

  No, 
    actually it wasn't. Let's not beat up on the new guy trying to understand. 
    OK? He wrote:

"The RPi2 could be used to replace a PC acid box to 
    interface with the RTCM's at your remote locations."

If the RTCM is 
    capable of running without a PC of some sorts why the RPi2?

Just help 
    me understand and if it troubles you you need not 
    reply.

-----Original Message----- From: Corey Dean
Sent: Thursday, 
    November 19, 2015 2:04 AM
To: ARM Allstar
Subject: Re: [arm-allstar] 
    BBB/Pi or RTCM

No!  I think that was explained to you right on 
    the first email. Only xipar and the rtcm can vote the way you 
    want.

Sent from my iPhone

    On 
      Nov 19, 2015, at 4:26 AM, R. Wayne <allstar at controlservers.net> wrote:

I think I 
      may not be communicating well. Is the BBB/Pi capable of replacing the RTCM 
      in voted operation?

-----Original Message----- From: David 
      McGough
Sent: Wednesday, November 18, 2015 11:01 PM
To: ARM 
      Allstar
Subject: Re: [arm-allstar] BBB/Pi or 
      RTCM

Hi,

Currently, the RTCM is the only solution for 
      endpoints--for true voting,
adding BBB or RPi2 endpoints won't solve 
      the problem. The software that
drives the RTCM boards only runs on 
      RTCM's....There is no functional
equivalent for the other platforms, 
      like the BBB or RPi2.

Note that when the RTCM was 
      conceived/developed, it preceded these tiny
high-performance Linux 
      boards by several years.  Now, looking toward the
future, a 
      software solution may become viable.  And, we've already 
      had
considerable discussion about this, pondering the direction of 
      future
development.

Anyhow, for now, adding RTCM's is your best 
      option.

73, David KB4FXC

      On 
        Wed, 18 Nov 2015, R. Wayne wrote:

Thanks. As I have written I am 
        a full time System Administrator and load the
OS on PC's 
      all the time. We already have a PC in a data center that our
current 
      RTCM talks to. We need to add remote receivers and there's my
question. 
      RTCM or use Pi's. Why would I choose Pi's? I know there is a
reason but 
      I don't know it yet. LOL Please tell me what the secret handshake
is!!! 
      For the love of Pete. Sorry. I got carried away.

-----Original 
      Message----- From: David McGough
Sent: Wednesday, November 18, 2015 
      10:33 PM
To: ARM Allstar
Subject: Re: [arm-allstar] BBB/Pi or 
      RTCM

Hi,

The RTCM is currently the only 
      AllStar-based voting solution.
Technically speaking, you'd have an RTCM 
      at each site where you've got a
receiver or transmitter. Then, all the 
      RTCM's would connect back to a
central server (which could be in a data 
      center, etc.) via an IP data
network. The central server would perform 
      the actual voting action and
send the resultant audio and telemetry 
      back the the transmitter site.

You could use a BBB, RPi2 or regular 
      PC as the central server, the RPi2
or PC being preferred for new 
      installations.

73, David 
      KB4FXC

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    the BBB and RPi2 web page - http://hamvoip.org 

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    mailing list
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Visit 
    the BBB and RPi2 web page - http://hamvoip.org

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  list
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  _______________________________________________

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  mailing list
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Visit 
  the BBB and RPi2 web page - http://hamvoip.org

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list
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Visit 
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