Why do i not have all UNII2e channels

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Hello

We have country code set for UK. Can someone please tell me why I don't get the full set of UNII2e channels to choose from. I only get 100, 104, 108 and 112. What has happened to the remaining 7 channels that should be available.
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Simon Vosper

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Posted 3 years ago

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Gareth Mitchell, Extreme Escalation Support Engineer

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Hi Simon

Can you confirm on which access point(s) you are seeing this on and also the firmware you are using?

If the AP has external antennas, which ones are selected?

Can you attach a screenshot showing what you are seeing?

Thanks




-Gareth
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Simon Vosper

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APs are 3715i's and firmware is  09.21.01.0179.

The attached picture is what I see when i try to edit channel plans.

As you can see there are some of the UNII2e channels missing
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Doug Hyde, Technical Support Manager

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The number of channels supported will change based on HT20 or HT40 MHz width selections.  HT40 has less supported channels than using HT20. 
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Simon Vosper

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Thanks Doug, that explains it. Seems an odd way to do it though. If I did HT40 then I would expect to see only 2 of the non DFS channels yet I can see them all.

Regards

Simon
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Simon Vosper

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Doug

Even at 20MHz i don't not get the full UNII2e channels available. Why is that?
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Doug Hyde, Technical Support Manager

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 Please note that not all 5Ghz channels have been certified for use on the 3715, specifically 120-136, 144 -165 are not in use. 
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Simon Vosper

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Great, thanks for the help Doug. Much appreciated.
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Simon Vosper

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Hi Doug

I don't mean to harp on about this, but the datasheet for the AP states the following:

5.47 to 5.725 GHz (FCC / IC / ETSI)

Now to me that would imply 5.47, 5.725 and everything in between, would you not agree?
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Doug Hyde, Technical Support Manager

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The datasheet is lumping in all countries that support those bands along with the ones that do not. The channel list the ap uses is based on the country selection of the ap. 

Thanks, 

Doug
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Simon Vosper

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seems a little misleading to me. Channel support is a very important aspect of AP capability. I think it should be clearer which channels extreme have stripped out in each domain. We are ETSI and a good deal of the missing channels are allowed in our reg domain. Do you know why they are not included?
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Doug Hyde, Technical Support Manager

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I will check with our Product Management Team to find out if we plan to re-certify the 3715 access points.
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Dennis Rysell, Employee

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Simon / Doug,

We confirmed with the compliance team, and this is a special case for the AP3715i. There were some limitations observed during certification testing. So for these reasons when AN-HT40 is selected only the channels in the pull down shown below would be available. Channels 132/136 are permanently disabled for band edge issues and channels 116-120 and 124-128 are disabled for DFS Channel availability check reasons. Channel 140 is not allowed as it would only be bonded up to channel 144 which is not allowed. As a result, for the AP3715i you are limited to the existing channels shown in the pull down.

Regards,

Dennis

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Ian Broadway

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Hello,

Sorry to bring this up again, can we elaborate on "channels 116-120 and 124-128 are disabled for DFS Channel availability check reasons."

I assume this is a vendor specific (Extreme) restriction of some sort?

I can quite happily use the channels on a different vendor in the UK.
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Doug Hyde, Technical Support Manager

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Thanks Dennis.
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Simon Vosper

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Dennis, that's great, thank you for providing this information

Doug - thanks for getting an answer on this, I appreciate the effort.

Regards

Simon