Patrick, I was quite taken aback at the notion that RSSI wasn't needed. RSSI is how you align a link. Not SNR. SNR alignment can give you a misaligned link, where you're avoiding noise, rather than finding max signal.
Either way, you need both... Just can't do without both, can't imagine even trying without both.... +++++++++++++++++++++++++++++++ neofast.net - fast internet for North East Oregon and South East Washington email me at mark at neofast dot net 541-969-8200 Direct commercial inquiries to purchasing at neofast dot net ----- Original Message ----- From: "Patrick Leary" <[EMAIL PROTECTED]> To: "WISPA General List" <[email protected]> Sent: Sunday, September 24, 2006 10:00 AM Subject: RE: [WISPA] vendor specs 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: [email protected] 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"<[email protected]> 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 ************************************************************************ ************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses. ************************************************************************ ************ -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ ************************************************************************ ************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses(191). ************************************************************************ ************ ************************************************************************ ************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses(43). ************************************************************************ ************ ************************************************************************ ************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses. ************************************************************************ ************ ************************************************************************ ************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses(192). ************************************************************************ ************ ************************************************************************ ************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses(43). ************************************************************************ ************ **************************************************************************** ******** This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses. **************************************************************************** ******** ---------------------------------------------------------------------------- ---- > -- > WISPA Wireless List: [email protected] > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
