Symbol WS5000 Series System Reference Manual page 720

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WS5000 Series Switch System Reference Guide
used when the AP does not support setting of DTIM per BSS, and will be indicated as such through the user
interface.
The AP indicates its ability to set the DTIM interval on a per BSS basis through the DeviceInfo message. If the
AP supports this feature, the switch will include an item with DTIM interval for each BSS the AP supports in
the configuration packet sent at adoption of the AP. If not, the switch will send the older configuration item
setting a per radio DTIM interval with the value indicated as the default DTIM interval in the AP Policy map.
If you modify the value of DTIM period for an AP Policy currently applied to any adopted APs, the switch will
send a configuration packet with the updated DTIM interval value to any such APs.
The AP sends a DTIM_POLL / QOS_DTIM_POLL for each BSS before DTIM time. The switch sends stored
broadcasts to the AP for that BSS on receipt of the message.
Currently only AP100 and AP300 support this feature.