12/10/2014 3:23 PM | |
Joined: 3/20/2013 Last visit: 4/3/2024 Posts: 676 Rating:
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hey kwtang, that is not that easy without having a closer look at: a) installation b) radiation environment (radar, ...?) c) configuration But let me give a few guesses: First of all please have a look at the following manual (hints about installation, configuration, ...): - RCoax System manual http://support.automation.siemens.com/WW/view/en/21286952 is the installation done correctly, .... - you can decrease the iPCF time to 64ms and have PNIO update time at 128ms. - another possibility is that you get a radar pattern and your AP changes the channel --> longer interruption. |
Last edited by: Fafner at: 12/10/2014 3:25 PMBest Regards, |
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12/12/2014 11:18 AM | |
Joined: 3/20/2013 Last visit: 4/3/2024 Posts: 676 Rating:
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hey kwtang, 1. what is the lowest dB level you are getting with the signal recorder? and what is the highest? 2. on client side you can define which channels are to be scanned. please configure this option with your used channels 149 and 153. --> that makes the roaming a lot faster. at the moment your clients are scanning all 5GHz channels before they roam. out of your description I assume that the channels have no interferences?! there you are sure? 3. which clients and APs are you exactly using? MLFB? and e.g.: are you using the newest FW? Which is the used FW-version? If you have the new devices here is the link to the FW: http://support.automation.siemens.com/WW/view/en/102255679 |
Best Regards, |
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12/12/2014 5:33 PM | |
Posts: 6 Rating:
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Hi fafner, 1.Power at 7dbm,the lowest is -77dbm and highest is -39dbm. See attachment. I had try 9 and 8dbm. but, i found at 7dbm, the communication is minimized. If i reduce further to 6dbm, i will be getting -70 to -85dbm, most of the time. So, I fix it to 7dbm and keep on monitoring it. 2. All the while, my configuration on clients had been set on this two channel only. 3. The Ap is scalance w788-1 M12 (6GK5 788-1GK00) while the client is scalancew748-1 m12 (6GK5 748-1GK00). All the ap and clients frmware had been update to version 4.00.01. This is my first project using this rcoax iwlan. It is gettting me crazy!!! What else can be done? Really appreciate all your help. Thanks AttachmentCarrier 8 with 7dbm.pdf (132 Downloads) |
12/15/2014 8:05 AM | |
Joined: 3/20/2013 Last visit: 4/3/2024 Posts: 676 Rating:
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hi kwtang, you did not answer one question: are the communication errors more often at special places or is it randomly?
the signal recorder file looks good. you can decrease it a bit more, but I think it's OK. (depending on the track. perhaps you should decrease it a bit more to avoid roaming between segments when it is not necessary) please have a check over the WBM. look at the AP and look at the client, please check if they see each other with almost the same strength. (you have to adopt the signal strength on both sides: AP and client.) (you can see this under information -> wlan -> wlan client/wlan AP or sth like that)
very good. that makes your roaming faster. perhaps post your configuration file?! or make some screenshots of the configuration (easier to read).
newest firmware --> check
ouh, perhaps we should start with the mounting (despite the signal trace is looking good.) You can get some help from the siemens support (limited support is for free, see link). there is a debug file which can be examined by the support to perhaps see reasons for the communication losses. www.automation.siemens.com/support-request Or you can get a specialist on site (ordered for youby your siemens salesman). then there will be some spectral analysis, mounting checks and configuration optimization executed. |
Best Regards, |
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