Should AP advertise as HT20/40 if it can only run HT20?

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We configured an AP to run on channel 6, HT40+.

But, due to scan results, it decided it could only run HT20 due to
overlapping BSS.

The scan results show it as having HT20/40 capability but
no secondary channel.

Is this expected?  I was thinking it might should not be advertising
the HT40.  We are running local patches, possibly we messed up something.

Thanks,
Ben



BSS 04:f0:21:7d:cc:36(on sta13) -- associated
    TSF: 0 usec (0d, 00:00:00)
    freq: 2437
    beacon interval: 240 TUs
    capability: ESS ShortSlotTime (0x0401)
    signal: -18.00 dBm
    last seen: 1 ms ago
    Information elements from Probe Response frame:
    SSID: brenttest-10k
    Supported rates: 1.0* 2.0* 5.5* 11.0* 6.0 9.0 12.0 18.0
    DS Parameter set: channel 6
    ERP: Barker_Preamble_Mode
    Extended supported rates: 24.0 36.0 48.0 54.0
    HT capabilities:
        Capabilities: 0x6e
            HT20/HT40
            SM Power Save disabled
            RX HT20 SGI
            RX HT40 SGI
            No RX STBC
            Max AMSDU length: 3839 bytes
            No DSSS/CCK HT40
        Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
        Minimum RX AMPDU time spacing: 8 usec (0x06)
        HT TX/RX MCS rate indexes supported: 0-23
    HT operation:
         * primary channel: 6
         * secondary channel offset: no secondary
         * STA channel width: 20 MHz
         * RIFS: 0
         * HT protection: no
         * non-GF present: 1
         * OBSS non-GF present: 0
         * dual beacon: 0
         * dual CTS protection: 0
         * STBC beacon: 0
         * L-SIG TXOP Prot: 0
         * PCO active: 0
         * PCO phase: 0
    Extended capabilities: SSID List, 6
    WMM:     * Parameter version 1
         * BE: CW 15-1023, AIFSN 3
         * BK: CW 15-1023, AIFSN 7
         * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
         * VO: CW 3-7, AIFSN 2, TXOP 1504 usec
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com


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