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WS-SVC-WLAN-1-K9 not working on SUP 720 and Cat 6506

I'm a Cisco employee so you can say I'm professional, but this really puzzles me: I have this Cat 6506 switch with SUP720 and latest image. It takes WISM card but not WLSM, the error msg being "unsupported". I'm using 15.1(2)SY3 image and used 12.2.33-SXI13. Is that because both WLSM cards are defective?

02:03:12: %OIR-SP-4-DISABLE: Unsupported service module WS-SVC-WLAN-1-K9 in slot 4 disabled

Router#sh mod
Mod Ports Card Type                              Model              Serial No.
--- ----- -------------------------------------- ------------------ -----------
  2   48  CEF720 48 port 1000mb SFP              WS-X6748-SFP       SAL1023QB9J
  3    4  WiSM 2 WLAN Service Module             WS-SVC-WISM2-K9    SAL17121AUD
  4    1  Wireless LAN Service Module            WS-SVC-WLAN-1-K9   SAD092706LG
  5    1  Wireless LAN Service Module            WS-SVC-WLAN-1-K9   SAD084301HU
  6    2  Supervisor Engine 720 (Active)         WS-SUP720-BASE     SAD072600D0

Mod MAC addresses                       Hw    Fw           Sw           Status
--- ---------------------------------- ------ ------------ ------------ -------
  2  0018.1854.578c to 0018.1854.57bb   1.5   12.2(14r)S5  15.1(2)SY3   Ok
  3  f0f7.5569.6c98 to f0f7.5569.6ca7   1.1   12.2(18r)S1  15.1(2)SY3   Ok
  4  0014.f22b.e0c2 to 0014.f22b.e0c9   1.0   Unknown      Unknown      PwrDown
  5  0003.3234.d5c0 to 0003.3234.d5c7   1.0   Unknown      Unknown      PwrDown
  6  000c.ce63.fb84 to 000c.ce63.fb87   2.3   7.7(1)       15.1(2)SY3   Ok

Mod  Sub-Module                  Model              Serial       Hw     Status
---- --------------------------- ------------------ ----------- ------- -------
  2  Centralized Forwarding Card WS-F6700-CFC       SAL1026SXT8  2.0    Ok
  6  Policy Feature Card 3       WS-F6K-PFC3A       SAD0728017X  1.2    Ok
  6  MSFC3 Daughterboard         WS-SUP720          SAD072801RW  1.5    Ok

Mod  Online Diag Status
---- -------------------
  2  Pass
  3  Pass
  4  Not Applicable
  5  Not Applicable
  6  Pass

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EOS and EOL Announcement for

EOS and EOL Announcement for the Cisco Catalyst 6500 Series Wireless LAN Service


This and you're running a high version code which no longer supports WLSM is the main reason why it's coming back as "unsupported".