kukur
join:2003-10-29
Saint Maries, ID
| reply to superdog
Re: Small packets ok... sustained lost.
said by superdog  :Is it possible that You have a radio somewhere on the network that has an ARP table that is screwed up?. I have a pair of Tranzeos(5A-24)that I am using for a backhaul link, and every time I added a customer, I had to reboot the master unit so the ARP table would flush and allow the new CPE to talk to the core router. Is there a way in Cisco AP's to mess with this setting?.  I thought of that too, but rebooting all APs and backhaul bridges doesn't seem to help. I have not been able to find anything on the Cisco APs/bridges to clear ARP. Just reboot.
*Tranzeo Sidenote* I have installed (since the windstorm previously mentioned) a pair of Tranzeo TR6-5a bridges as the backhaul on this tower because of problems with the older Cisco bridges after the storm. I know that the ARP table on these gets buggered up when I use my laptop out in the field and then in the office. I have to reset the bridge from another computer before I can access the APs from my laptop.... |
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kukur
join:2003-10-29
Saint Maries, ID
| reply to gunther_01
said by gunther_01 :I will ask if the other clients on this AP also read 50% signal quality on the AP. Signal Quality is different on just about everything, but, I still have a problem with that reading 50% (biased opinion from Star V3 signal quality reading). I will stand by my Interference or AP side radio, cable, antenna problem. Especially since it has just happened after 2 plus years, and replacement CPE's had the same result. Yes. This client is farther to the west on the same AP and does medical transcription at home via our service. She actually called the other day to say how GOOD the service has been since we have put in the new backhaul. Still showing some retries, but no where near the errors.
»smgazette.com/ap-other.gif |
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kukur
join:2003-10-29
Saint Maries, ID
| reply to lutful
said by lutful :Anyway can you fix the Cisco AP to transmit at 1Mbps too? One issue could be how Tranzeo firmware handles continuous switching between 2Mbps to 1Mbps speeds. Yes, for testing I have limited the AP and CPE to only transfer at 1Mbps - same issue. I have tried it at the low range and auto still no good.
I went up to the tower and temporarily installed a Tranzeo TR-6000 AP with integrated antenna and aimed it directly at the problem customers/spot.
Changed the SSID on the problem client's CPEs and they linked right up and passed traffic with no problem. |
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superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
| reply to Keithb
Is it possible that You have a radio somewhere on the network that has an ARP table that is screwed up?. I have a pair of Tranzeos(5A-24)that I am using for a backhaul link, and every time I added a customer, I had to reboot the master unit so the ARP table would flush and allow the new CPE to talk to the core router. Is there a way in Cisco AP's to mess with this setting?.
--
»www.wavecrazy.net Join WISPA today! »www.wispa.org/ |
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Keithb
join:2003-09-16
US | reply to lutful
I believe it was Stealthwave who was having the issue with the coax this past summer. I recall a thread and talking to him about that. |
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lutful
Premium
join:2005-06-16
Ottawa, ON
 ·TekSavvy Solutions..
| reply to LLigetfa
said by LLigetfa :There was anecdotal evidence posted recently where the weaker Rx signal passed through bad coax fine but the stronger Tx was getting discombobulated. It is a theoretical possibility. I recall such a conjecture put forward by John Galt in response djhurt during the summer months. Unfortunately the cable was discarded before any tests could be done.
Since then I have collected, tested and posted photos of some visibly damaged cables that amazingly still work.
I can say confidently that if the RF signal path is damaged in such a way that 1W signal is "shorted to ground" at certain points during common modulation schemes, the same scenario will occur so many times during a single packet transmission that no packet could be transmitted without error.
But this Cisco transmitted and recieved thousands of packet successfully, so there is something else going on. |
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LLigetfa
join:2006-05-15
Fort Frances, ON
| reply to lutful
said by lutful :But please remember that exact same antenna and cable is receiving without any error. There was anecdotal evidence posted recently where the weaker Rx signal passed through bad coax fine but the stronger Tx was getting discombobulated. It is a theoretical possibility. |
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gunther_01
Premium
join:2004-03-29
Saybrook, IL
| reply to lutful
While others have had good luck I suppose. I have never had a good, stable or otherwise working connection when I fix or have a radio using 1mb data rate. If it can't at least sustain 5mb I fix it or it's a no go for an install simply for that reason. Others experience varies it seems.
I will ask if the other clients on this AP also read 50% signal quality on the AP. Signal Quality is different on just about everything, but, I still have a problem with that reading 50% (biased opinion from Star V3 signal quality reading). I will stand by my Interference or AP side radio, cable, antenna problem. Especially since it has just happened after 2 plus years, and replacement CPE's had the same result. |
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| reply to kukur
said by kukur :Everything points to something at the AP antenna not broadcasting as cleanly as it should from what I see. But please remember that exact same antenna and cable is receiving without any error. It is even receiving all those retry requests from Tranzeo without error.
Anyway can you fix the Cisco AP to transmit at 1Mbps too? One issue could be how Tranzeo firmware handles continuous switching between 2Mbps to 1Mbps speeds. |
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kukur
join:2003-10-29
Saint Maries, ID
| reply to lutful
said by lutful :What model CPE are these? You mention they are 2.5 yrs old? I very much doubt the -95dB noise reading since CPE is not managing to receive at even 2Mb/s. It was an older Tranzeo CPE2 - but both are now fresh Tranzeo CPQ units.
The bandwidth is low because I thought there might be not enough stability to hold 11mbs - so I set the CPE at 1mb for testing to see if that would help.
Everything points to something at the AP antenna not broadcasting as cleanly as it should from what I see. I was hoping to get through winter and then had the plan set to replace/add new APs. Looks like I may not have that luxury.
I have checked other clients more in the sweet spot of the APs range and am finding retry requests there as well (not nearly as bad however) just as gunther alluded to. |
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| reply to kukur
Cisco AP is getting almost 50% packet re-send requests from these CPEs when sending to CPE at 2Mb/s rate.
Cisco AP is receiving thousands of packets from the CPEs without error at 1Mb/s rate and 50% signal strength.
What model CPE are these? You mention they are 2.5 yrs old? I very much doubt the -95dB noise reading since CPE is not managing to receive at even 2Mb/s. |
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kukur
join:2003-10-29
Saint Maries, ID
| reply to lutful
1. Correct
2. Correct
3. Correct
I have installed a new CPE at the old client's location with same results. Defaulted, re-configured the CPE and used 3 different firmware versions thinking the same thing. No difference.
I brought the original CPE back to the office and it connected fine here to a different AP.
Here is a shot of the APs info for the customers...
»smgazette.com/old-customer.jpg
»smgazette.com/new-customer.jpg
Here is the performance stats from CPEs
»smgazette.com/old-cpe.jpg
»smgazette.com/new-cpe.jpg
Here is a ping sequence to both...
»smgazette.com/old-ping.jpg
»smgazette.com/new-ping.jpg
My next step is to take the original CPE back out and do a site survey with it and see if it will communicate in a different location to the same AP. |
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