[ANSS-netops] ANSS-netops Digest, Vol 44, Issue 3
Jon Rusho
jon at seis.utah.edu
Mon Feb 11 17:15:41 UTC 2013
Talking to some of our cell providers, they claim that the data channels
are typically not impacted the way voice channels are. That said, they
may be thinking more along the lines of short, burst messages (text,
sms) instead of continuous data flow. Reading some of the articles
circulating about the communication issues from Hurricane Sandy, it
sounds like text/sms was available when voice wasn't.
This does highlight the rationale for a diversity of telemetry paths.
For example, UUSS uses cell modems, spread-spectrum radio (900MHz and
2.4GHz), DSL and other network connections from the site hosts (e.g.,
microwave, T-1, etc). We also still maintain our network of
short-period stations on FM VHF radios. This diversity has helped out
during non-disaster outages; e.g., a site host replaces a firewall and
knocks out telemetry but a nearby station on spread-spectrum radio still
provides data for that region.
--jon
--
===================================
Jon Rusho
Seismic Network Engineer
University of Utah Seismograph Stations
jon at seis.utah.edu
801-585-5523
Greg Steiner wrote:
> 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?
> Greg Steiner
> On 2/9/2013 6:00 AM, anss-netops-request at geohazards.usgs.gov wrote:
>> Send ANSS-netops mailing list submissions to
>> anss-netops at geohazards.usgs.gov
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> https://geohazards.usgs.gov/mailman/listinfo/anss-netops
>> or, via email, send a message with subject or body 'help' to
>> anss-netops-request at geohazards.usgs.gov
>>
>> You can reach the person managing the list at
>> anss-netops-owner at geohazards.usgs.gov
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of ANSS-netops digest..."
>>
>>
>> Today's Topics:
>>
>> 1. Re: Cell modem? (Antonio Sanchez)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 8 Feb 2013 17:45:43 -0600
>> From: Antonio Sanchez <a.sanchez at reftek.com>
>> To: Philip Crotwell <crotwell at seis.sc.edu>
>> Cc: "anss-netops at geohazards.usgs.gov"
>> <anss-netops at geohazards.usgs.gov>
>> Subject: Re: [ANSS-netops] Cell modem?
>> Message-ID:
>> <CAPyYzv=iaBd=D+CAubhWx1RbBNC_tPLj87d6V3WRW+TqoY-BYQ at mail.gmail.com>
>> Content-Type: text/plain; charset="windows-1252"
>>
>> 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 <crotwell at seis.sc.edu>wrote:
>>
>>
>>> 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 <given at caltech.edu> wrote:
>>>
>>>
>>>> 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. | given at caltech.edu or doug at usgs.gov |
>>>> | Pasadena, CA 91106 | http://earthquake.usgs.gov |
>>>> +-----------------------------------------------------------------+
>>>>
>>>> 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?****
>>>>
>>>>
>>>> _______________________________________________
>>>> ANSS-netops mailing listANSS-netops at geohazards.usgs.govhttps://geohazards.usgs.gov/mailman/listinfo/anss-netops
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> ANSS-netops mailing list
>>>> ANSS-netops at geohazards.usgs.gov
>>>> https://geohazards.usgs.gov/mailman/listinfo/anss-netops
>>>>
>>>>
>>>>
>>> _______________________________________________
>>> ANSS-netops mailing list
>>> ANSS-netops at geohazards.usgs.gov
>>> https://geohazards.usgs.gov/mailman/listinfo/anss-netops
>>>
>>>
>>>
>>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> ANSS-netops mailing list
> ANSS-netops at geohazards.usgs.gov
> https://geohazards.usgs.gov/mailman/listinfo/anss-netops
>
More information about the ANSS-netops
mailing list