[App_rpt-users] Audio Clipping with IAXRPT / Web Transceiver Client

[Robert a. Poff]

Does the clipping occur usually on the same stations?
Or sort of randomly?

In addition to CPU load, how much free memory do you have?
I was told that you should have enough memory to not see ANY swapping.
And found that to be a good rule of thumb.
The time involved with disk access comes into play.


Keith Goobie <keith at goobie.org> wrote:

>Good day All.
>
>We have had our node up at VE3LSR / VE3UOR for a few months and we all
>have
>learned a lot about configuration and operation.  It is ACID install
>and
>version id is 300.3.
>
>On our asterisk system, we support three nodes:
>
>27211 ­ VE3UOR UHF repeater
>29133 ­ VE3LSR coupled through a RLC-DSP404 controller (often connected
>to
>VE3UPS and VE3UHN), and
>29154 ­ VA3LSR remote link for VE3LSR into VE3MUS ­ not too active ­
>ad-hoc
>RF link.
>
>I have also been testing out iaxrpt and the WebTransceiver clients.
>
>I am on these systems and the results have been promising.  I do notice
>some
>clipping on the audio on some stations.  Initially I thought it was
>amplitude related ­ over-driving the URI-FOB, but I am now beginning to
>suspect that it may be network related and in my research I hear the
>term
>jitter being used ­ which if activated, adjust operation on the
>receiving
>end only.
>
>It may be that the system is not powered enough to drive the three
>uri-fobs.
>CPU show about 25% busy.
>[root at VE3LSR etc]# cat /proc/cpuinfo
>processor    : 0
>vendor_id    : GenuineIntel
>cpu family    : 15
>model        : 4
>model name    : Intel(R) Pentium(R) 4 CPU 3.00GHz
>stepping    : 3
>cpu MHz        : 2992.898
>cache size    : 2048 KB
>physical id    : 0
>siblings    : 2
>core id        : 0
>cpu cores    : 1
>apicid        : 0
>fdiv_bug    : no
>hlt_bug        : no
>f00f_bug    : no
>coma_bug    : no
>fpu        : yes
>fpu_exception    : yes
>cpuid level    : 5
>wp        : yes
>flags        : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
>cmov pat
>pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc
>pni
>monitor ds_cpl est cid cx16 xtpr
>bogomips    : 5985.79
>
>We do think that the system is sufficiently powered.
>
>We are looking for comments & guidance.  Are we expecting too much from
>the
>system having three fobs connected?  We do have good bandwidth into and
>out
>of the site.  
>
>I am listening to other systems ­ most not to busy, so I am not yet
>able to
>get a good reference point.
>
>I have not dabbled with the codecs much, but have been focused on using
>ulaw.  I am also testing with GSM ­ lower bandwidth.
>
>So as I said before, thoughts or suggestions are welcome.
>
>Keith / VA3YC
>-- 
>keith at goobie.org
>Keith Goobie
>Richmond Hill, ON, CANADA
>
>
>
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>
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-- 
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