Allied Telesis AT-WA7500 - Manual (Page 144)

5 - Configuring the Spanning Tree
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Clear this check box if the frames that are received are forwarded
without conversion; that is, when a SNAP frame is received from
an 802.11b or 802.11a radio with an Organizationally Unique
Identifier (OUI) equal to 000000, it will be forwarded without
conversion.
RFC1042 Types to Pass Through
If the RFC1042/DIX Conversion field is Enabled, this parameter
specifies values for protocol types that are to be passed without
conversion. The list includes the Apple Talk protocol type, value
80F3.
Values entered in this parameter represent the protocol types of
frames that will be passed without conversion to DIX format.
3. Select Submit Changes to save your changes. To activate your
changes, select Save/Discard Changes from the menu bar then Save
Changes and Reboot. For help, see Saving Configuration Changes
on page 41.