[App_rpt-users] toggling power on USB buss

Doug Bade kd8b at thebades.net
Wed Mar 26 16:49:02 UTC 2014 

I am not sure if Supermicro site is wrong but they indicate that server uses
a X9SCL-F board which has 9 usb 2.0 ports..  It looks like 3x2 headers on
the motherboard.. each of those handles 2 usb ports..
In have not had issues with 2 URI devices sharing a header or adjacent rear
panel ports... I will check my exact config next trip to the site.. but with
usb 2.0 it should not be an issue....
Most of the time the 4 repeaters on mine are independent but even when
hooked together in conference locally, no jitter /loss etc... in them...

Doug
KD8B

-----Original Message-----
From: Keith Goobie [mailto:keith at goobie.org] 
Sent: Wednesday, March 26, 2014 12:30 PM
To: Doug Bade; app_rpt-users at ohnosec.org
Subject: Re: [App_rpt-users] toggling power on USB buss

At our site we have an older Intel based platform running three URI USB
fobs.  It is running in a nominal manner, but we did spread out the URI to
different usb buses, and we experienced better audio performance (less
clipping) when we implemented / reversed the DTMF relaxed parameter.

We acquired a SuperMicro 5017C-MTF server, intended to replace our existing
platform.  It has four USB ports.  Expansion / addition of new ports can
only be done through a PCIe interface.  Initially we installed a USB3.0 card
- epic fail through lack of research as USB 3.0 is not supported on Centos
5.x environments.

OK, secured a USB 2.0 PCIe card.  Installed, moved two URI over and all good
- audio quality is good.  As soon as the environment was set up to run
three, audio became garbled.  Spoke with DMK and they did indicate PCIe USB
interfaces can be prone to bandwidth issues.

We are left to consider:
1. XIPPR trial, will run on Centos 6.x, facilitating use of USB3.0 card, but
bandwidth will likely continue to be an issue.
2. Consider use of simpleusb interface, assuming less bandwidth issues.

Based on info above, I am open to guidance or comments.

Keith

On 3/26/14 10:56 AM, "Doug Bade" <kd8b at thebades.net> wrote:

> I am not disputing the observations but wanted to pass along my 
> experience... as it seems contrary to some others experiences. My 
> controller PC is 1u Supermicro Atom cpu class board.
> 
> This is very interesting....
> 
> I have never had a USB URI dropped from our repeater in 4+ years or so 
> I have been running them. 4 repeaters connected to one rack mount PC.. 
> I am wondering what the manifestation is that causes this as the only 
> drops I ever saw were when I tried to use a 33 foot usb cable ( I had 
> to look very hard to get one that long that was well shielded ) and it 
> really did not like it. I use 12  foot usb cable versions or so and never
since had a drop.
> Granted, our repeaters have very light traffic today compared to years 
> ago... but it would seem that maybe there is something else causing 
> this as it *CAN* work for long periods without fail...
> 
> I do have the Controller Allstar PC on a UPS so it never loses power ( 
> site has backup generator behind that ) and it is almost never linked 
> to anyone else outside the site, just the local stations to each other ...
> 
> Maybe some form of interference or RFI ??? My site is a heavy uhf and 
> 800 site but everything in the shelter is in Superflex and combiners. 
> The antennas are 500+ feet above the ground.. no RFI of significance 
> in the shelter, with 30 or so transmitters, 2 of them Broadcast FM and 
> next door is an HD UHF TV... on same tower..
> 
> Doug
> KD8B
> 
> -----Original Message-----
> From: app_rpt-users-bounces at ohnosec.org 
> [mailto:app_rpt-users-bounces at ohnosec.org] On Behalf Of Keith Goobie
> Sent: Wednesday, March 26, 2014 7:59 AM
> To: kk6ecm; Geoff
> Cc: app_rpt-users at ohnosec.org
> Subject: Re: [App_rpt-users] toggling power on USB buss
> 
> It is for this and other reasons, that we have installed an AC Power 
> Controller at our site - it is from Digital Loggers and it is found at 
> http://www.digital-loggers.com/epcr2.html
> 
> Keith
> 
> 
> On 3/26/14 7:45 AM, "kk6ecm" <kk6ecm at gmail.com> wrote:
> 
>> Similar experience here... It seems Asterisk stops talking to the
> device...
>> could be the operating system. sometimes entering "service asterisk
> restart"
>> from the command line works, if not "reboot" from the command line. 
>> If all else fails, then a hard reboot.
>> 
>> Hoping to hear from others on this.
>> 
>> Bob
>> kk6ecm
>> 
>> 
>> Sent from iPad
>> 
>> 
>> On Mar 26, 2014, at 7:34 AM, Geoff <ars.w5omr at gmail.com> wrote:
>> 
>>> I'm seeing info here and there on whether power cycling a USB device 
>>> (without shutting down the whole system) is possible or not.
>>> 
>>> On occasion, I have the need to physically walk into the repeater 
>>> room and check to see if the lights are blinking on the URIx's, 
>>> because sometimes they -stop-.  (Damnit, Jim - I a radio operator, 
>>> not a URIx heartbeat cardiologist ;->).
>>> 
>>> My quick and dirty thought would be to find a way to discover, via 
>>> software, whether or not a specific URIx had a green-blinking light 
>>> and if not, power-cycle that usb device.
>>> 
>>> Anyone have an idea on this?
>>> 
>>> -Geoff/W5OMR
>>> 29655
>>> 
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> 
> --
> keith at goobie.org
> Keith Goobie
> Richmond Hill, ON, CANADA
> 
> 
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--
keith at goobie.org
Keith Goobie
Richmond Hill, ON, CANADA

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