If the general concensus is that RSSI is a must, then I will try to
convince PM to add such a reading.
Patrick Leary
AVP WISP Markets
Alvarion, Inc.
o: 650.314.2628
c: 760.580.0080
Vonage: 650.641.1243
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
*On Behalf Of *Gino A. Villarini
*Sent:* Sunday, September 24, 2006 9:48 AM
*To:* 'WISPA General List'
*Subject:* RE: [WISPA] vendor specs
The problem with SNR for alignment purposes is that you are dealing
with a variable in noise, with rssi you work with fixed numbers. I’m
not dissing SNR, it is extremely important, But for example, in order
to trouble shoot a link … let say I install a Link and Im seeing a a
SNR of 6 on this link,how the heck can I determine if the antenna is
miss aligned or the noise floor is very high ???
Gino A. Villarini
[EMAIL PROTECTED]
Aeronet Wireless Broadband Corp.
tel 787.273.4143 fax 787.273.4145
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
*On Behalf Of *Patrick Leary
*Sent:* Sunday, September 24, 2006 12:24 PM
*To:* WISPA General List
*Subject:* RE: [WISPA] vendor specs
Right, but the LED bar on the CPE can be used to do that. I mean,
isn't SNR more complete than just RSSI, meaning if your SNR is good
than the RSSI is by default good. Anyway, I have never heard of any
moderately experienced VL user say the units did not convey enough
info to easily establish a link and understand the quality of the
connection. Consider that with the CPE VL radio the LEDs will show:
WLAN link light-
· Solid Green – Unit is associated with an AU, no wireless link activity
· Blinking Green – Data received or transmitted on the wireless link,
blinking rate is proportional to wireless
traffic rate
· Off – Wireless link is disabled
Status light –
· Solid Green – Power is available and self-test passed
· Blinking Amber – Testing (not ready for operation)
· Red – Self-test failed – fatal error
Ethernet light –
· Solid Green – Ethernet link between the indoor and outdoor units is
detected, no activity
· Blinking Green – Ethernet connectivity is OK, with traffic on the
port. Blinking rate proportional to traffic rate
· Red – No Ethernet connectivity between the indoor and outdoor units
SNR bar –
· Red LED: Signal is too low (SNR<4 dB)
· Orange LED: Signal is too high (SNR > 50 dB)
· 8 green LEDs: Quality of the received signal (green LEDs translate
per below)
LED 1 (red) is On - Signal is too low (SNR < 4 dB)
LED 2 (green) is On - SNR > 4 dB
LEDs 2 to 3 (green) are On - SNR > 8 dB
LEDs 2 to 4 (green) are On - SNR > 13 dB
LEDs 2 to 5 (green) are On - SNR > 19 dB
LEDs 2 to 6 (green) are On - SNR > 26 dB
LEDs 2 to 7 (green) are On - SNR > 31 dB
LEDs 2 to 8 (green) are On - SNR > 38 dB
LEDs 2 to 9 (green) are On - SNR > 44 dB
LEDs 2 to 9 (green) and 10 (orange) are On Signal is too high (SNR >
50 dB)
Mod level : Sensitivity : Min. SNR (this chart for 20MHz channel)
1 : -89 dBm : 6 dB
2 : -88 dBm : 7 dB
3 : -86 dBm : 9 dB
4 : -84 dBm : 11 dB
5 : -81 dBm : 14 dB
6 : -77 dBm : 18 dB
7 : -73 dBm : 22 dB
8 : -71 dBm : 23 dB
Patrick Leary
AVP WISP Markets
Alvarion, Inc.
o: 650.314.2628
c: 760.580.0080
Vonage: 650.641.1243
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of G. villarini
Sent: Sunday, September 24, 2006 8:48 AM
To: wireless@wispa.org
Subject: RE: [WISPA] vendor specs
Patrick,
Rssi is very important to determine if a link is properly aligned and
its achieving its link budget.
Altough we don’t use alvarion(yet), we are currently researching
backhaul options and the way we comission ptp links here is that we
run the calcs on radio mobile and spreedsheet to determine the link
budget in advance to implementation. Snr won’t help much there...
Gino
-----Original Message-----
From: "Patrick Leary"<[EMAIL PROTECTED]>
Sent: 9/24/06 11:32:47 AM
To: "WISPA General List"<wireless@wispa.org>
Subject: RE: [WISPA] vendor specs
Brad,
Software controlled dual polarity might be nice. Not sure why you
consistently harp on us though since no one else has it either other
than your longtime preferred vendor.
I am not as convinced about your complaint about RSSI. Is it just used
to RSSI like being used to feet in stead of meters. But also, isn't RSSI
less sophisticated and a less useful number than SNR since it is only an
indication of receive signal without discounting noise? SNR provides a
more accurate representation of wanted signal since it discounts for
unwanted noise.
Not sure of your complaint about the RJ45. No one else remarks about it
and we don't have issues with water intrusion. In other words, it works
well. If the opening was enlarged you increase the potential for water
intrusion.
Following the color code? Yes, as an old cabling guy, I would agree. But
I am pleased to note that one is really running out of things to harp
about when one continually highlights this a major deficiency.
So now that I have responded here to your public mail, will you please
admit that even if the VL came to life and saved your kid from a flood
you complain that it was not fast enough and that it ripped the kid's
clothes. I wish some day you'd accept that your customer chose VL and
you should take the opportunity to learn about it instead of still
trying to make it fail so you can get them to switch to Trango. Even the
best radios will have room for improvement and every decent brand should
have something special that differentiates it. You work so hard to find
fault you miss opportunities to become proficient in more than one
brand. So accept our invitations to allow engineer visits and accept our
invitations to be trained. Know what I mean?
Patrick Leary
AVP WISP Markets
Alvarion, Inc.
o: 650.314.2628
c: 760.580.0080
Vonage: 650.641.1243
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