D-Link Air DWL-900AP User Manual page 37

SNMP Utility Menus (continued)
Fragment Threshold:
Fragment Threshold defines a threshold above which the wireless packet
will be split up, or fragmented. For a fragmented packet, if transmission of
part of it were to be interfered with, only the portion that was successfully
transmitted would need to be re-sent. Throughput will generally be lower for
fragmented packets, since the fixed packet overhead consumes a higher
portion of the RF bandwidth.
Preamble Type:
Preamble is the first sub-field of PPDU, which is the appropriate frame format
for transmission to PHY (Physical layer). There are two options, Short
Preamble and Long Preamble. The Short Preamble option improves
throughput performance.
Authorized MAC Address
For security purposes the Access Point can discriminate its associations with
other wireless stations. The Authorized MAC Address lets you select which
stations are allowed throughput on the wireless interface. First you must
enable the MAC address authorization table by placing a checkmark in the
Enable Auth. Table box. When you want to leave this menu click OK to use
the table. The table is maintained manually and can be updated and edited
by downloading MAC addresses to the data table. This is described below.
You can supply a list of authorized MAC addresses to the Access Point.
Perform the following tasks:
1. Click the Load file button and enter the file name and location of the file
you want to load. The file should contain the MAC addresses you wish to
add to the table of authorized addresses. The file should be a simple text
document with each MAC address written on a separate line.
2. Once the file has been loaded, click the Download button to download
the Authorized MAC Address file to the Access Point.
Click on Get to obtain a list of the Authorized MAC Addresses currently
entered on the table.