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wireless12
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is it relaible?

Tue Jan 06, 2009 1:59 pm

hello frds.

For last 3-4 years i m delivering internet as a WISP in pure 2.4 ghz, i never used 5.7, or 5.8 ghz to deliver internet. to my customers.(but i hav 3-4 PTP links on 5.8 ghz) ,
NOW, as 2.4 ghz is getting crowded day by day and there is less non-overlapping channels. i found difficult to maintain the quality of my services. there is lot of disturbance in connectivity. i m looking to Install a Base station of 5.8 for my wireless customers.

- will 5.8 prove better for me.
- shd i used sector antenna, or just omni is sufficient.
- what CPE u would recommend. easy to install and stable too

my choice:-
- for AP i will choose RB 433AH and i will give a try to R5H
- CPE i hav to choose frm RB411+R 52 or UBNT- PS5, NS5

most important:

1. what is the concept of LOS in 5.8 bec in practical terms, i found 2.4 ghz CPE easily connecteven if the height is not sufficient for clear LOS.

2.what would be expected challenges in 5.8 when i used it in Point to Multipoint wireless connectivity.


3.what points shd be kept in mind to run a smooth wisp on 5.8 GHZ (point to multipoint wireless connections).
 
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jp
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Re: is it relaible?

Tue Jan 06, 2009 4:07 pm

5.8ghz is reliable. We have used it with Alvarion VL and Trango gear for many years. I would suggest a sector antenna at the AP. 5.8 has greater freespace loss and the sector gain can make up for that. The omnis for 5.8 are also kinda fussy; they work OK on a pole at short height, but don't work so well on hilltops as they have a much less forgiving pattern. Their pattern also changes with frequency which can be frustrating.

There is no room for obstructions to LOS. If you don't have LOS, don't do the install. A few branches in someones yard can really screw up a link.

The freespace loss and lack of penetration can make it easier to reuse 5.8ghz frequencies at other sites in town without self-interference.

I would not use an NS5 for CPE unless it is close enough to not need an external antenna. The NS5 loses lots of db gain if you need to use the external due to the way the circuit board is layed out for the ext antenna port. We've added a 23 dbi gain antenna to one and it only got 1-2 dbi better gain than the builtin.
 
gmidia
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Re: is it relaible?

Wed Jan 07, 2009 10:01 pm

5.8 is very stable, if you require a QOS better use mikrotik all through and make sure there is LOS, PS5 & NS5 could be an alternative.
 
wireless12
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Re: is it relaible?

Fri Jan 09, 2009 7:27 am

so i means. that 5.8 is reliable but more challenges as far as LOS is concerned. right?
 
gmidia
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Re: is it relaible?

Fri Jan 09, 2009 8:06 am

not that there are challenges all need LOS the lower the frequency the higher the penetrating capabilities
 
RK
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Re: is it relaible?

Sat Jan 10, 2009 11:23 am

There is no room for obstructions to LOS. If you don't have LOS, don't do the install. A few branches in someones yard can really screw up a link.
I have gone thru concrete high rises with XR5s and 22dB antennas on PTP links.
I agree with the rest of your post.
 
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G-lox
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Re: is it relaible?

Sun Jan 18, 2009 8:01 pm

I have to agree with jp. I have been using 5.8 for all of my customers for a few years, in a rural environment. Lots of mountains. A couple of branches in the way of a 5.8 link will cause all sorts of problems. They get wet, they move they grow and change shape. A concrete high rise doesn't. I've shot 5.8 through a 1 sq meter gap in between two houses, it worked great for 3 years. a tree started to grow in between the houses and the link got worse and worse until it was unusable.
 
gmidia
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Re: is it relaible?

Sun Jan 18, 2009 8:16 pm

NS5 is a good CPE if working within a radius 3 Km. if you need to long distances then you can go for the PS5 which could work a distance of 5-7Km i dont recomend the use of external antennas on the nanos and/or the PS's. But always make sure you have a LOS and not compromising on the Fresnal Zone unless in a desparate situation.
 
wireless12
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Re: is it relaible?

Tue Jan 20, 2009 2:54 pm

ok.. ths very useful informations from u people..no what u suggest for sactor antenna.. shd i use 90 degree or 120 degree. which is best in 5 ghz band.
 
gmidia
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Re: is it relaible?

Tue Jan 20, 2009 4:10 pm

that will be dependant on your area of coverage and if you are using 4 sectors then 90 degrees will do if using 3 sectors then 120 will do. But it all relies on the area you intend to cover.
 
wireless12
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Re: is it relaible?

Fri Jan 23, 2009 1:49 pm

some people recommend 90 degree instead of 120 degree in 5ghz operations..why?
 
gmidia
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Re: is it relaible?

Fri Jan 23, 2009 3:17 pm

90 degrees will have less interference due to a smaller beam width as opposed to the 120 degrees.And the 90 degrees will usually give you a longer distance coverage as opposed to 120 degrees. But it is all dependant on ones infrasttature. 4 sectors of 90 degrees will carry more cpe's as opposed to 3 sectors of 120 degrees. Eg if one radio carries about 35 cpes that means 4 sectors will carry about 140 and 3 sectors will carry 105 cpes
 
wireless12
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Re: is it relaible?

Tue Jan 27, 2009 2:36 pm

ok, after lot of discussion,
i make up my mind to use 90 degree sector
i will use 411A+R5H WITH EACH SECTOR.
I will allow only 35 CPE on each sector.
i will use NS5,PS5,or RB411 for CPE

now: will the combination of 411A+R5H is sufficient for 35 CPE, i don't wanna use RB433 for some reasons.

all costumers are within 10 km from the base station.

will this setup work.


thxx.
 
gmidia
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Re: is it relaible?

Tue Jan 27, 2009 4:49 pm

should work. when you say 10 km that means 5km radius?

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