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I am curious as to what the cellular providers are saying about
availability of their networks after a natural disaster. I am not
talking about cell sites that are destroyed in a disaster, but
effects arising from abnormal call volume. From what I have seen up
here there are always widespread reports that cellular calls don't
go through regularly after a tornado. It seems everyone has natural
tendency to get on the phone to check on people in the affected area
and this clogs up the network. Is cellular modem traffic handled
with a different priority? Will you find that data from your sites
is not available when you need it the most? does anyone have
experience with these types of issues?<br>
Greg Steiner<br>
<div class="moz-cite-prefix">On 2/9/2013 6:00 AM,
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Today's Topics:
1. Re: Cell modem? (Antonio Sanchez)
----------------------------------------------------------------------
Message: 1
Date: Fri, 8 Feb 2013 17:45:43 -0600
From: Antonio Sanchez <a class="moz-txt-link-rfc2396E" href="mailto:a.sanchez@reftek.com"><a.sanchez@reftek.com></a>
To: Philip Crotwell <a class="moz-txt-link-rfc2396E" href="mailto:crotwell@seis.sc.edu"><crotwell@seis.sc.edu></a>
Cc: <a class="moz-txt-link-rfc2396E" href="mailto:anss-netops@geohazards.usgs.gov">"anss-netops@geohazards.usgs.gov"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:anss-netops@geohazards.usgs.gov"><anss-netops@geohazards.usgs.gov></a>
Subject: Re: [ANSS-netops] Cell modem?
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Hi All,
A 5 GB data plan will suffice, 6 channels at 100 SPS, gain 1, with a c0
compression will be around 3Gb a month and at c2 about half of that for
quite places. We have AT&T and Verizon plans.
For real numbers, I can mention that we are running the following setup
in the field for more than a year now : 6 Channels( First three channels
at highg gain), 100 SPS, c2 and our daily usage is around 120-140 Mb for a
very noisy station and 60-80 Mb for quieter stations.
I asked around about the c0 and c2 mystery, back in the 80's with the 72
Series we called our compressed data c0 (C and Zero) it was a Hex value,
very similar to CO for compressed, that's was probably the only
compression we could talk about back then and there was no need to say
Steim1, just Steim compression. Along the way we did another c1
compression for "specific reasons" and then Steim2 in which case we called
it c2. So users know about c0 and c2 and don't worry about c1 and nothing
beyond c2 for now.
Antonio
On Fri, Feb 8, 2013 at 4:29 PM, Philip Crotwell <a class="moz-txt-link-rfc2396E" href="mailto:crotwell@seis.sc.edu"><crotwell@seis.sc.edu></a>wrote:
</pre>
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<pre wrap="">
We have been doing 3 x 100sps from refteks over cell modems with no data
volume problems and accidentally had 6 x 100 sps at one station for a
while. It came in fine with no "over the gigabyte limit" issues. I think we
have 5Gb/month caps as well, on verizon and AT&T.
Using compression on the refteks helps alot, so use either CO or C2, but
be aware that C2 for a very quiet station can pack more samples into a
reftek packet than will fit into a tracebuf, resulting in the tracebuf
being booted out of the system. For most normal stations this shouldn't be
an issue, and in the cases where it is you can use CO or can set the gain
to x32, or both.
Philip
On Fri, Feb 8, 2013 at 5:19 PM, Doug Given <a class="moz-txt-link-rfc2396E" href="mailto:given@caltech.edu"><given@caltech.edu></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">
Our real-world numbers from 6-channel Q330s (Steim 2 compression)
show volumes of about 3.2Gb/mo or less. We have exceeded the 5Gb/mo limit
when there is some pathology at the station that causes lots of resends. So
far our carrier, Verizon, has not dinged us for any overages.
+-----------------------------------------------------------------+
| Douglas Given | Project Chief |
| U.S. Geological Survey | S. California Earthquake Monitoring |
| Caltech Seismological Lab | (626)583-7812 FAX: (626)583-7827 |
| 525 So. Wilson Ave. | <a class="moz-txt-link-abbreviated" href="mailto:given@caltech.edu">given@caltech.edu</a> or <a class="moz-txt-link-abbreviated" href="mailto:doug@usgs.gov">doug@usgs.gov</a> |
| Pasadena, CA 91106 | <a class="moz-txt-link-freetext" href="http://earthquake.usgs.gov">http://earthquake.usgs.gov</a> |
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On 2/8/2013 1:53 PM, James H Bollwerk (jbollwrk) wrote:
Just getting into the cell modem game and need help.****
We?ll be Streaming 6 x100 sps from a RT130-01/6 with a Raven XE (ATT
provider). ****
Our university plan will allow 5GB per billing cycle. With compression
that should work.****
Does anyone have real world data usage numbers?****
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