Estimate of satellite vs. Land-based traffic
pdonner at cisco.com
Wed Jan 7 03:14:14 UTC 2009
While technically you are correct, I would say that you probably should
also add a category for mobile communications LAND/SEA/AIR. The traffic
for these will be increasing in time as vendors are starting to put
switches and routers on-board spacecraft making applications that were
once borderline, because of delay, more acceptable. Depending on what
you are doing (eg. comm between two satellite ground stations, mobile or
stationary) the application can benefit from from reduced RTT due to
this innovation. One-way delay would thus be about 250ms. This is
greater than the generally accepted 150ms for a voice call but with good
voice quality 250ms is not bad. This of course is based on GEO sats.
LEO or MEO satellites are much closer to the earth so the delay would be
less but they present a whole host of other complexities.
While satellites will probably never come close to the volume of
ground-based comm, they will cater to niche markets, military, mobile
and disadvantaged users.
WRT Kevin's query, if you are concerned about a solar incident and it's
affects on satcom, you might want to take a look at what user base (e.g.
which mobile users and what impact loss of comm will have on what they
are doing) is affected rather than understanding the volumes that are
affected as this might provide a much more thorough understanding of any
impact. But that is merely my two cents worth.
Jeffrey Lyon wrote:
> Satellite transport is common mainly in areas where land based
> infrastructure is not feasible. In developed nations this is almost
> exclusively the case. Satellite latency is far too high to rely on it
> for routine communications unless used as a last resort.
> Best regards, Jeff
> On Tue, Jan 6, 2009 at 3:34 PM, <Kevin.Smith at dca.state.fl.us> wrote:
>> Participting in a severe solar event EXERCISE. Can anyone give me an
>> educated guesstimate of the percentage of backbone traffic that is
>> satellite dependent vs. that which is totally land-based?
>> Kevin Smith
>> Information Systems & Services
>> Department of Community Affairs
>> kevin.smith at dca.state.fl.us [preferred]
>> 850.922.9921 [voice]
>> 850.487.3376 [fax]
>> Sent from a BlackBerry Wireless Handheld
>> Florida has a broad public records law and all correspondence, including
>> email addresses, may be subject to disclosure.
More information about the NANOG