Your customer's 802.11n laptops cannot detect the SSID in the 5 GHz band in a conference room, but your 802.11ac laptop connects without issue. What is the most likely explanation for this discrepancy?
Channel 144 in the 5 GHz band is part of the UNII-2 Extended band. Not all 802.11n devices support this channel, as its inclusion came later in the standard's development. Conversely, 802.11ac devices have broader support for 5 GHz channels, including channel 144. Therefore, if the Access Point (AP) is operating on channel 144, 802.11n laptops that do not support this channel will be unable to detect the SSID, while 802.11ac devices will connect without issue.
[Reference: CWDP-305 Official Study and Reference Guide, Chapter on ProtocolandSpectrum Analysis, , ]
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