fyi,
I believe that it's oxygen that absorbs 60 gig. Not so much rain. Often
companies tie 60 gig and FSO together for short hop very high speed
redundant links. Each fades differently in different weather.
Note, everything above 10 gig has rain fade, some bands just more so than
others as I understand it.
laters,
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my own wisp!
64.146.146.12 (net meeting)
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message -----
From: "John Scrivner" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Tuesday, December 12, 2006 8:33 AM
Subject: Re: [WISPA] high throughput backhaul options
Replies below:
Matt Liotta wrote:
Guys,
We are now exceeding Orthogon's capacity on a regular basis.
Wow! Business must be good!
We are backhauling as much as we can with fiber, but that isn't an option
in the suburbs. We have had good success with BridgeWave's products, but
the distance is a problem. Any suggestions on a product that can do high
throughput in the 5-10 mile range?
Look at licensed. I know that is obvious but I think it is the only way
short of bonding Orthogons together. I thought the max distance for 70 GHz
gbps radios was about 7 miles. It has been a while since I read the specs.
I am sure the rain fade would be an issue here. There is actually much
less attenuation of 70 GHz than there is at 60 GHz. There is a spike of
absorption of 60 GHz where water molecules eat that signal. It gets better
above 60 GHz. I believe that you can go through the air better with as
high as 100 GHz than what you can with 60 GHz. Obviously there are other
licensed options in lower frequency space as well. I know Charles has some
experience running licensed high capacity backhaul. Charles, what do you
run for backhaul over 100 mbps FDX?
I am looking for something that can easily exceed 100Mbps full duplex. I
know the specs of the Orthogon Spectra and no it doesn't really get us
past 100Mbps full duplex.
24Ghz unlicensed is looking like the sweet spot for us.
I thought 24 GHz unlicensed had limited bandspace which made the top end
about 100 mbps FDX?
I bet Bob Moldashel has hit this same wall before. What do you do in this
situation Bob? He was one of the guys who helped put New York City data
traffic back together after 911. Any thoughts Bob?
Scriv
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