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30 Messages

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402 Points

Thu, Sep 19, 2013 5:27 AM

Touchstar Boston 8500 Handheld Scanner Disconnecting

Hi all,

We have quite 40 Touchstar Boston 8500 (http://www.touchstar.co.uk/product_mo...) Hand Held Barcode scanners that connect via ZoneFlex 7352 controlled by a Smart Standby Zondirector 1100 to our network.

We have just started testing and what we have found is that the hand held units seem to "disconnect" from the network at random intervals (5-60 minutes) all sleep and power setting are either off or on max. The hand held still has an IP address but the device can no longer access the LAN or can be pinged from any machine within our network. To reconnect we need to put the device in standby mode and then switch it back on, this effectively restarts the network card.

The WLAN card that the handheld has is a Summit, I have found a setting that I thing may be responsible for the drop off's as it may interfere with what the ZoneDirector is trying to do: http://www.summitdata.com/Documents/G...

Agressive Scan is a feature in Summit WLAN cards that actively looks for better Ap's and try's to connect to them, from my understanding the ZoneDirector will transfer the device between Ap's? Would this be culprit?

Any help appreciated.

Thanks,
Julius

Responses

368 Messages

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5.6K Points

7 years ago

Do you have ChannelFly enabled? If so, try disabling it and see if it makes any difference.

30 Messages

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402 Points

Thanks Jazzycow, I am going to give that a try. I have moved to Background Scanning.

30 Messages

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402 Points

I initially didn't have "Automatically adjust AP radio power to optimize coverage when interference is present." Enabled but have switched it on for testing.

11 Messages

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192 Points

Hi Jazzycow, have given that a go. It is happening less now but the symptoms still persist. Any other thoughts?

368 Messages

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5.6K Points

Is now CF on or off?

30 Messages

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402 Points

Hi Primoz, no CF is off. We thought that it would be better to leave it off to eliminate the amount of traffic going to the clients. Is it better to have it ON? What are the benefits?

30 Messages

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402 Points

7 years ago

There has been a new development in the situation, we have added a few laptops to the wireless network and now the laptops are experiencing the same thing. So this is no longer isolated to hand held devices only. We have isolated the issue to occur while the connected devices are migrating between AP's.

Any thoughts any one?

368 Messages

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5.6K Points

7 years ago

IS it allways one or 2 APs that this occurs on or all of them?

Which FW are you using? Have you upgraded to 9.6.1? Did the upgrade go through to all the APs OK?

Do you have a spectral analyzer and an L2 analyzer you can use to help with this?

30 Messages

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402 Points

7 years ago

Hi Primoz, it's all of them. We had also once thought it was one or two AP's but this has happened to many oof them

All I have is Wifi Analyzer app on my android phone.

We are still on FW 9.5.

368 Messages

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5.6K Points

9.5.2 or still 9.5.0?

30 Messages

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402 Points

9.5.1.0 build 50

368 Messages

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5.6K Points

OK. Recommend you go 9.6 then 9.6.1

368 Messages

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5.6K Points

7 years ago

How is the network set-up there? is it a simple "flat" network or more sofisticated with VLANs, with L3 roaming?

Could you try tunneling a particular SSID to the ZD and see if it helps?

30 Messages

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402 Points

7 years ago

It's a simple flat network, no VLAN's.

We have switched it on now, will update you in about 60 mins of any changes.

Thanks for your help.

368 Messages

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5.6K Points

7 years ago

Please copy and paste from the RF info of a few APs all lines under the below 2 subjects

------------ PHY Error Stats ------------

and

------------ Airtime Stats ------------

30 Messages

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402 Points

WASP005
------------ PHY Error Stats ------------
6896450 PHY errors since clearing all stats (rx_phyerr)
1 phy cck restart
5577245 phy ofdm group
1319204 phy cck group
0 PHY errors since clearing delta stats (1 sec)
Histogram of PHY errors per second (pcttime in each range)
0 1-500 ..1K ..2K ..5K ..10K ..20K ..50K .100K more
20 76 3 1 0 0 0 0 0 0

------------ Airtime Stats ------------
Airtime utilized (percent) since clearing delta stats (1 sec)
Busy: 0 RX: 11 TX: 3 Total: 14
Histograms of airtime (pcttime in each range) since clearing all stats
0 0-10 ..20 ..30 ..40 ..50 ..60 ..70 ..80 ..90 ..100
busy: 92 7 0 0 0 0 0 0 0 0 0
rx: 0 94 5 0 0 0 0 0 0 0 0
tx: 5 95 0 0 0 0 0 0 0 0 0
tot: 0 89 9 1 0 0 0 0 0 0 0

WASP009
------------ PHY Error Stats ------------
8089188 PHY errors since clearing all stats (rx_phyerr)
5445398 phy ofdm group
2643790 phy cck group
0 PHY errors since clearing delta stats (1 sec)
Histogram of PHY errors per second (pcttime in each range)
0 1-500 ..1K ..2K ..5K ..10K ..20K ..50K .100K more
15 81 2 2 1 0 0 0 0 0

------------ Airtime Stats ------------
Airtime utilized (percent) since clearing delta stats (1 sec)
Busy: 0 RX: 8 TX: 1 Total: 9
Histograms of airtime (pcttime in each range) since clearing all stats
0 0-10 ..20 ..30 ..40 ..50 ..60 ..70 ..80 ..90 ..100
busy: 91 8 1 0 0 0 0 0 0 0 0
rx: 0 90 9 1 0 0 0 0 0 0 0
tx: 5 94 1 0 0 0 0 0 0 0 0
tot: 0 78 17 3 1 0 0 0 0 0 0

WASP012
------------ PHY Error Stats ------------
83606678 PHY errors since clearing all stats (rx_phyerr)
6 phy cck restart
60633540 phy ofdm group
22973132 phy cck group
6 PHY errors since clearing delta stats (1 sec)
6 phy cck restart
Histogram of PHY errors per second (pcttime in each range)
0 1-500 ..1K ..2K ..5K ..10K ..20K ..50K .100K more
16 80 1 1 1 0 0 0 0 0

------------ Airtime Stats ------------
Airtime utilized (percent) since clearing delta stats (1 sec)
Busy: 0 RX: 7 TX: 2 Total: 9
Histograms of airtime (pcttime in each range) since clearing all stats
0 0-10 ..20 ..30 ..40 ..50 ..60 ..70 ..80 ..90 ..100
busy: 94 5 0 0 0 0 0 0 0 0 0
rx: 0 85 13 2 0 0 0 0 0 0 0
tx: 7 93 0 0 0 0 0 0 0 0 0
tot: 0 75 21 3 1 0 0 0 0 0 0

368 Messages

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5.6K Points

Well. It' probably not interference. It looks pretty clean.

Is tunneling helping?

30 Messages

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402 Points

Unfortunately not really, we are going to upgrade to 9.6 now. Thanks for looking at our logs.

368 Messages

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5.6K Points

7 years ago

Run an AP-ZD SpeedTest for every AP. Is there any packet loss?

30 Messages

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402 Points

Morning Primoz, we ran ping testing over night from the ZD to AP's and to all of our core switches, 40 000 packets sent 0% packet loss. We have upgraded to 9.6.1 and the initial results seem promising. Will keep you updated.

368 Messages

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5.6K Points

7 years ago

Any change?

30 Messages

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402 Points

Am afraid not, devices still dropping off.

368 Messages

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5.6K Points

Probably the best thing would be to open a case now and send some logs. Although a packet capture wouldn't hurt. It's strange that the problem is roaming. I've never heard of this and I've worked with some pretty bad clients in my time.

What's the security setting?
Is the security different on other SSIDs if any other?

Could you also try maybe channel width on the APs. Use 20MHz and check. Although it is on 20 right now, maybe explicitly fixing it will help.

30 Messages

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402 Points

Thanks :) We are talking with Ruckus at the moment, have sent them some logs last Friday waiting for them to come back.

Were using WPA2-PSK AES, we're onlyh running one SSID at present.

We have changed to 20mhz now, seems optimisticly more stable.

Thanks for all your help will keep you posted in the next few days of the outcome.

368 Messages

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5.6K Points

OK. I'd be interested in solving this. We have a few projects on the horizon for bar code scanners.

30 Messages

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402 Points

We have dropped the power of the AP's to -4Db, we have also tweaked the settings on the network card we set "Roam Trigger" to -55dBm, "Roam Delta" to 10dBm and "Roam Period" to 5 sec. But in my opinion this is all down to the wireless cards of the handhelds. We did the exact same test to the devices and iPhones / Samsung Galaxy's and laptops and the results were as you would expect them to be. I would steer clear of Taouchstar Kit, we have some Intermec's and they have been working 100%.