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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