NOT AT ALL. Sure in high valume CPEs, a Non-Polling system will get hit
with a performance drain as more users are put on, more than a polling
system, but no where near a penalty of "half". unless really pushing
acceptable oversubscription rates in PtMP. PtP systems are primarilly
advantageous for reaching full capacity because they can operate at higher
power levels than PtMP APs, and therefore withstand the noise, to connect at
Full modulation with maximum SNR ratio. Its hard getting a 30db SNR in both
directions, using PtMP. The first three years of our development was ALL
PtMP, and ZERO PTP. There jsut wasn't a need with low noise, the performance
was great. As the Noise floor rose, so did the need to add PTP systems, to
survive that noise. That is the beauty of systems like Alvarion or similar
that can run on Smaller 10Mhz channels. It affords the option to add
narrower width sectors to reduce noise, and addition of PTP links without
taking down your close in PTMP customers that can survive the noise.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "George Rogato" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Thursday, March 01, 2007 8:28 PM
Subject: Re: [WISPA] ALVARION VL 4.0 AP
One thing I am wondering about, and it's not an Alvarion specific question
or concern is, isn't it true that when you use a subscriber unit as your
backhaul on a PtMP set up like you are suggesting, that the through put is
halved or somewhat diminished?
Thought this was a long standing rule of thumb.
George
Mac Dearman wrote:
Patrick,
Thanks for that info - I appreciate it much.
What I am trying to accomplish is (kill a bunch of birds with one stone)
connect these 5 remote locations via wireless to the hospital (AU located
here) and then use the 6th SU on my tower (1 mile LOS) to provide 10mbps
of
dedicated bandwidth to the hospital.
Thanks,
Mac Dearman
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Patrick Leary
Sent: Thursday, March 01, 2007 11:42 AM
To: WISPA General List
Subject: RE: [WISPA] ALVARION VL 4.0 AP
Mac,
I understand you spoke to Les today. Made me smile for sure. Thanks also
for sharing the story about Michael Eck helping during Karina. He is a
humble guy and I've never heard him mention it.
The BreezeACCESS VL can certainly do what you want there. An AU,
especially at those ranges should be able to provide the full capacity
of just over 30mbps (net ftp). So you could provide 6 connections close
range of 10mbps a piece with an oversubscription ratio of only about
2:1. Assume that a typical over subscription for high end commercial
customers is about 4 or 5 to 1, you should be sitting pretty. I am not
clear about your tower need. Are you asking if you can
dedidcate 10mbps to a tower, which then would have that capacity used to
feed in to 802.11 APs that feed other clients?
1. How far is that tower?
2. You should be able to dedicate 10mbps to the tower, leaving 20mbps to
serve the 6 hospital customers with an oversubscription ratio that would
still be nice and low.
Do have Mike Cowan confirm, as John advises.
Patrick Leary
AVP WISP Markets
Alvarion, Inc.
o: 650.314.2628
c: 760.580.0080
Vonage: 650.641.1243
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Mac Dearman
Sent: Thursday, March 01, 2007 8:58 AM
To: 'WISPA General List'
Subject: RE: [WISPA] ALVARION VL 4.0 AP
Someone give me a hand here please.
I have a contract to deliver 10Mbps dedicated bandwidth to a hospital as
well as building them a leased wireless network for the hospital to 6
off
site buildings. All of these buildings (but 1) are with in "rock
throwing"
distance of the Hospital. I am looking at the Alvarion VL 4.0 AP to do
the
wireless connections. Here is my dilemma since I am very limited in VL
knowledge:
1. Will I be able to not only connect these 6 out lying buildings, but
also
place one of the SU's on my tower to provide them with the 10Mbps
dedicated
BW? Or will I need to do a PTP?
2. I believe the AP is only possible of 10Mbps total???
Thanks,
Mac Dearman
--
George Rogato
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