5ghz range question

[Matt Cooper]

Hello,

I'm currently moving to a 5ghz solution, due to my WGB's deauthenticating due to possible interference

However, the area I have to cover is 350ft in length, with centralizing a 1242 with two Cisco Aironet 6-dBi Omnidirectional Antenna (AIR-ANT5160V-R), that leaves around 150 ft each way.

Do you think this is possible? I currently have a 12dbi high gain antenna on 2.4 right now, but I get the following:

Oct  3 18:05:26.359: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 68bc.0cb8.6a09

Oct  3 18:05:26.359: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0000.bcc7.ef05

Oct  3 18:05:26.359: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0000.bc58.c1ae

Oct  3 18:05:26.359: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 68bc.0cb8.6a43

Oct  3 18:05:26.359: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 68bc.0cb8.6a41

Oct  3 18:05:26.360: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 7081.0592.8c14 Reason: Previous authentication no longer valid

Oct  3 18:05:26.360: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0000.bcc8.21cf

Oct  3 18:05:26.360: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0000.bc58.b3cf

Oct  3 18:05:26.361: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 68bc.0c9b.f841

Oct  3 18:05:26.364: %DOT11-4-MAXRETRIES: Packet to client 7081.0592.8c64 reached max retries, removing the client

Oct  3 18:05:26.366: %DOT11-4-MAXRETRIES: Packet to client 7081.0592.8c14 reached max retries, removing the client

I'm going to assume this is interference causing this, since we are in a factory with lots of noise. When the WGB is directly under the antenna/root bridge, there seems to be very little deauthenticating.

Any suggestions or more information, please let me know

Thank you.

[Scott Fella]

Your antenna gain is too high. The issue is that your device (WGB) can't reach the AP. you can increase the coverage your AP signal is being sent using a high gain, but your devices might have a low to zero gain antenna so how are those devices suppose to be heard by the AP.

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[Matt Cooper]

Scott,

Currently the WGB's are using a AIR-ANT2451V-R=

Do you see these antennas having an issue with a 12 dbi antenna?

Thank you.

[Scott Fella]

Usually any antenna over 6db is for outdoor use.  So if you look at the ANT2451v-R, that is only a 2db gain on the 2.4 ad a 3db gain on the 5ghz.  Try matching the antenna and see if your issue goes away.  You can also test to see how far of a coverage you get without issues or performance issues.

Thanks,

Scott

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[Matt Cooper]

My concern was, would a lower gain antenna be able to cover the 350ft total? 150 each side, so that's why I used a higher gain antenna.

I think my hold back is the antennas on WGB end (ANT2451v-R) Any good suggestions? This WGB runs on a system that can move 150ft away from the root bridge.

Thank you.

[Scott Fella]

Matt,

If this root bridge is on a mobile unit, you might have to look at a higher gain to be able to reach the root bridge. You also need to understand RF. the higher gain you go, the less elevation you have. So if your antenna is mounted high and your mobile units are low, the signal can pass above the mobile units. What your trying to is increase coverage as much as possible, but you also have to understand that there are some case in which this will not work or will not work good. You can test... See how far these mobile units can go without an issues or areas were they can go without having any issues.... That would be your max. 150' isn't far but you need to know your antenna pattern and understand your coverage.

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[Matt Cooper]

Scott,

My root bridge is not mobile, my WGB's are. The root bridge is mounted around 15ft in the air centralized.

The WGB's are around 12-13 ft in the air, which those are mobile.

My signals are always -40-70dbm, even at the end of the track. But, towards the end I get massive deauthenticating issues. Even though the signal is still between 40-70. Which that leads me to interference, or maybe even though the signal is reported good, does that still mean the signal it's getting is still weak?

[Matt Cooper]

Here's some information:

VLAN              : 75

Hops to Infra     : 0                  Association Id   : 1

Tunnel Address    : 0.0.0.0

Key Mgmt type     : WPAv2 PSK          Encryption       : AES-CCMP

Current Rate      : 48.0               Capability       : WMM ShortHdr ShortSlot

Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0

Voice Rates       : disabled           Bandwidth        : 20 MHz

Signal Strength   : -52  dBm           Connected for    : 3292 seconds

Signal to Noise   : 42  dB            Activity Timeout : 15 seconds

Power-save        : Off                Last Activity    : 0 seconds ago

Apsd DE AC(s)     : NONE

[Scott Fella]

You don't need root bridge, you just have that as an access point and have the WGB connect to that. I know the WGB are mobile and not the root bridge:)

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[Matt Cooper]

Scott,

The reason I have it as a root bridge is they all need to be on the same network. It's completely seperate from my other networks. I have 1 root bridge and 3 WGB's

[Scott Fella]

Okay, but you can do that with an access point. Create an ssid for the WGB and point that to the specific vlan.

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[Matt Cooper]

What is the benefit of doing this? Root bridge vs running as regular AP?

[Matt Cooper]

I think the confusion maybe that I should of pointed out there was no on-site controller involved in this.

[Scott Fella]

I know... controllers don't allow bridging.  If you want to keep your setup, then I would just tweak your data rates settings.  Maybe disable the low data rates.  Interference doesn't seen like an issue with SNR that you have. If you do think its interference, then you need to use a spectrum analyzer to find that out.  SO you only have one root bridge and 3 WGB's that is all.  Are there any other wireless in the area?

Thanks,

Scott

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[Matt Cooper]

Scott,

Ever since I've implemented the lower data rates, my wireless solution seems to be working stable now for them. I suppose when it gets further away, my data rates were slowed down, which my old minimum date rate was 11. Now it's 1.

Thanks.