[arm-allstar] Portable Node Excessive Data Usage

[David McGough]

Frank,

If you're using the uLAW CODEC, 400mb of bandwidth is about 12 hours of 
one-way audio. The way I came up with that number is from calculations 
based on real, measured bandwidth use. Here is the calculation:

(400 megabytes of data)
/ (0.0094 megabytes per second for uLAW)
= (42553 seconds of audio)
/ (3600 seconds per hour)
= (11.8 hours of audio)

As mentioned in a message from last year 
(http://lists.hamvoip.org/pipermail/arm-allstar/2016-August/003563.html ), 
the actual measured bandwidth requirements for several common CODECs are:

(All results in Kbytes-per-second for an actual IAX2 UDP data stream)

ULAW	9.4
G726	5.5
iLBC	3.5
GSM	3.2


....Now I have more CODECs to add to that list, which will be added to our
codebase soon (again in Kbytes/s):

In beta test:
CODEC2(3.2kbit)	2.0

In pre-alpha test:
AMBE+2(2.0kbit)	1.6

Note that AMBE+2 will require external hardware. The CODEC2 audio quality 
is definitely "digital" sounding. And, AMBE+2 sounds like DMR, etc. 


73, David KB4FXC



On Sun, 2 Jul 2017, "Frank McKibben via arm-allstar" wrote:

> I have been working on an Allstar project to set up a portable node in my
> RV.  I have been testing with  a Verizon 4G hotspot for connectivity.  The
> node seems to be working fine except for one issue that I am trying to wrap
> my arms around.  The only device that I  have connected to the hotspot is
> the Raspberry Pi Allstar node so I could get some measure of the data usage.
> I connected the node to our local repeater system via a hub that the club
> has dedicated to AllStar connectivity.  Our local repeater is in a rural
> area of Colorado and not what I would characterize as an overly busy
> repeater.
> 
>  
> 
> Over a two day period my hotspot consumed about 400mb of data which seemed
> like a lot to me.  I was expecting that the data usage would be pretty
> efficient with just the AllStar node using the hotspot and was surprised by
> my seemingly high usage.   Since I'm new to the portable node world I
> thought Id get some input from other users to see if this is a normal data
> usage rate.  Are there some background processes taking place that could be
> consuming data?  If so can they be turned off or scaled back ?  
> 
>  
> 
> N0AFO
> 
>  
> 
>  
> 
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