Hi Aparna,
ACM values can be defined in the EDCA profile. This profile in turn gets mapped to SSID profile.
(Aruba) (config) #wlan edca-parameters-profile ?
ap Configure an EDCA Parameters profile (AP)
station Configure an EDCA Parameters profile (Station)
(Aruba) (config) #wlan edca-parameters-profile ap ?
<profile-name> Profile name
(Aruba) (config) #wlan edca-parameters-profile ap test
(Aruba) (EDCA Parameters profile (AP) "test") #voice ?
acm Admission control mandatory
aifsn Arbitrary inter-frame space number
ecw-max Maximum contention window (exponent)
ecw-min Minimum contention window (exponent)
txop Transmission Opportunity slots in 32 usec units
<cr>
(Aruba) (EDCA Parameters profile (AP) "test") #voice acm ?
0-1 0 to disable ACM; 1 to enable ACM