Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Scanning Access Points configured with JAPAN Channels


I have configured the below mentioned configuration for my Access Point. These wireless networks are not appearing in windows client network list. I have tried explicit scan also. Still it is not showing networks with 184,188 channels. But it is showing all remaining networks.

Country code: JAPAN

SSID for WLAN 1: Wireless Network1

WLAN 1 mode: 5 GHz 54Mbps (802.11a)

WLAN 1 auto channel: Enabled

WLAN 1 channel: 184 (4920MHz)

WLAN 1 alt. channel: 188 (4940MHz)

SSID for WLAN 2: Wireless Network2

WLAN 2 mode: 5 GHz 54Mbps (802.11a)

WLAN 2 auto channel: Enabled

WLAN 2 channel: 188 (4940MHz)

I am using CISCO AIRONET 802.11a/b/g WIRELESS ADAPTER. This problem can occur due to the following reasons.

(1) Do I need to set any region settings at Adapter?

(2) Does adapter firmware depends upon

country? How do I check the adapter firware?

(3) Is there anything wrong with adapter vendor driver? Do I need to set anything in driver level for supporting JAPAN channels.

Anyone please help me to identify and resolve the above problem.



Re: Scanning Access Points configured with JAPAN Channels

What channels are available? The 802.11b standard defines a total of 14 frequency channels. The FCC allows channels 1 through 11 within the U.S.; whereas, most of Europe can use channels 1 through 13. In Japan, you have only one choice: channel 14.

An important concept to note regarding channel assignments is that the channel actually represents the center frequency that the transceiver within the radio and access point uses (e.g., 2.412 GHz for channel 1 and 2.417 GHz for channel 2). There is only 5 MHz separation between the cente frequencies, and an 802.11b signal occupies approximately 30 MHz of the frequency spectrum. The signal falls within about 15 MHz of each side of the center frequency. As a result, an 802.11b signal overlaps with several adjacent channel frequencies. This leaves you with only three channels (channels 1, 6, and 11 for the U.S.) that you can use without causing interference between access points.

New Member

Re: Scanning Access Points configured with JAPAN Channels

Thanks for the reply.

I can set acccess point country as 'Japan', then i can select 184,188 channels for SSIDs.

But why this is not appearing in windows client list?

New Member

Re: Scanning Access Points configured with JAPAN Channels

Please find the below link:

In the above table,184,188 channels are supported by JAPAN.

Please clarify it. I am a beginner into this field.

CreatePlease login to create content