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Point to MultiPoint Deployment |
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Written by Start a WISP Site Admin
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Friday, 15 April 2005 |
"I'm going to be supplying the 3 cities below with Wireless Internet,
but I'm a little stumped on exactly how many antenna's and AP's I will
need on each site. The Hub Site is installed at the Medical Springs
Location and needs to supply the other two cities with internet. If it
was just a Point to Point it would be a lot easier. I dont need
specific on equipment brands, just details or idea's on setup. I know
I'm going to need a high ration of signal to noise for this to work
well. Would it be easier to go from Medical Springs to Haines with a
PtP and then another PtP from Medical Springs to North Powder? Im going
to run 2 90 degree sectors(2.4 spectrum) at each site including the Hub
site, plus the direction antenna(5.7 spectrum for the PtP.)
I would also like to implement FHSS(Raylink) for the AP's supplying the bandwidth if possible. Below is some info:
Mediacal Springs Elevation 3440 feet
Medical Springs- Antenna Elevation 3,800
Haines Elevation = 3,333 zipcode 97833
Haines Antenna Elevation 3,790
North Powder Elevation 3,279 97867
North Powder Antenna Site 3,837
Link to
Medical Springs to Haines = 10 miles
Haines to North Powder = 11 miles"{mos_sb_discuss:7}
cmaenginsb:
You realize the FHSS systems won't do more than 1.8 Mbps or so right?
When
you say you are "supplying the cities with wireless internet" does that
mean you intend to support multiple customers or you are just supplying
certain buildings.
To start with I would run seperate PtP
connections to each of the other cities. Do this with a professional
grade system at a minimum. Also do you understand that this technology
requires line of sight between the radios?
Personally I would
not use FHSS as it is a little bit restrictive in terms of bandwidth as
well as the fact that they aren't developing any new FHSS systems so
you're kinda coupling yourself with a stagnant technology.
In
order to make decisions on a distribution system we need to know what
kind of bandwidth per customer you intend to offer, what kind of budget
do you have for the CPE (ie how much can each one cost realistically
not perfect world), how about the presence of trees (Oregon has a few
of them the last time I checked), the possibility for interference etc.
Trying to do 3 cities at once is a wee bit ambitious for someone asking the kind of questions you are, no offense.
operad (original submitter):
I understand LOS and also the fresnal zone. I've read tons of
information and also have read Jack Ungers book a couple of
times(attending seminar soon). The reason I ask these questions is
because I haven't deployed anything this big. Why not start with the 3
cities? If I'm going to do it then why not start big, I honestly don't
see a problem with this(Maybe I'm missing something). Medical
Springs(50% broadband) is 9,800 population, North Powder(NO Broadband)
400 and Haines(No Broadband) about 400.
I intend on supporting business's and residential users for fixed broadband at the below speeds:
256/128
512/256
768/256
I already have my T1 ordered. Thinking of getting a bonded T-1 if it calls for it.
For CPE's I was looking at tranzeo TR-CPE200-19 or TR-CPE80-15. I want to keep it under $250.00.
From
each of my PtP I can see the other point clear LOS, the FRESNAL zone is
good(60% Clear would be 28.6 ft/ Medical Springs to Haines.5 miles x 5
miles, correct me if I'm wrong)
I havent seen any 400-500ft Tree's in town lately. Did you not look at the Elevation?
DejanCDN:
We find Tranzeo CPEs a bit pricey. Instead, we use HGA-2400 Pro 31s and
Pro 35s ($119/$59). Also, I didn't notice any mention of traffic
shaping on Tranzeo web site. HGA's allow you to set Uplink/Downlink
speed right in the CPE, conserving your bandwidth at the source.
superdog1:
I would also like to add something. I am a WISP that uses Raylink and
Alvarion FHSS radios. We are actually going to have to redeploy some
newer and faster gear in some areas, as I have some customers that need
more bandwidth than the FHSS radios can supply.
While I wouldn't call FHSS "stagnant"(Call Brad Larson @ Alvarion and tell him that, I dare You! ,
LOL!), I would say that every type of technology has it's place. If all
You plan on doing is suppling the speeds mentioned above?, You will
have a hassle free, interference free network. On the other side of the
coin, If You feel that faster speeds will be needed some day, You need
to take a long hard look at what You are about to do so that You are
prepared for the future.
Original thread location
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Sample Networks