User's Manual

Handlink AP-100
Commercially Confidential
62
AMPDU：IEEE802.11n aggregation of MAC protocol data unit.
AMPDU Limit：Maximum number frames in 11n frame aggregation.
AMSDU：IEEE802.11n aggregation of MAC service data unit.
Max Tx/Rx Streams：Maximum number of transmit streams/receive streams in 11n MIMO.
Beacon Interval：Default setting is 100 ms (equivalent to 10 beacons per second). The amount of
time between AP-100 BTS beacon transmissions for each supported BSS, with each BSS using the
same beacon interval. The beacon interval can be configured between 20 and 1000 ms.
DTIM：Default setting is 1. DTIM Interval, always a multiple of the beacon period, determines
how often the beacon contains a traffic indicator map (TIM). The TIM alerts clients in sleep state to
stay awake long enough to receive their data frames. The value range is from 1 to 255.
Fragmentation Threshold：Default setting is 2346 bytes. The fragmentation threshold, specified in
bytes, determines whether data packets will be fragmented and at what size. Frames that are smaller
than the specified fragmentation threshold value will not be fragmented. Frames that are larger than
the fragmentation threshold will be fragmented into smaller packets and transmitted a piece at a
time instead of all at once. The setting must be within the range of 256 to 2346 bytes. It is
recommended to use the default value or only minor reductions of this default value.
Protection Mode：Default setting is "None". If set to "CTS-Only" then when protection is turned
on and prior to the transmission of an 802.11g frame, the AP sends out a CTS frame (also known as
CTS-to-Self) to set the NAV in all the clients so that they will not transmit during the time period of
the subsequent data packet from the AP. If set to "RTS-CTS" then the AP sends a RTS frame, waits
for the clients CTS frame and then sends the data packet. Setting "RTS-CTS" will allow more
robust operation, but at the expense of additional overheads.
RTS/CTS Threshold：If a frame is smaller than the RTS/CTS threshold, it will be sent by the AP
without modification. If a frame is larger than the RTS/CTS threshold, then two frames will be sent
by the AP. The first frame is an RTS (request to send) frame. After the RTS frame is sent, the AP
listens for the corresponding CTS from the target client. Upon reception of the CTS, the AP then
sends the data frame. There are trade-offs when considering what value you should set for the
RTS/CTS threshold. Smaller values will cause RTS to be sent more often, increasing overheads.
However, the more often RTS packets are sent, the sooner the system can recover from collisions. It
is recommended to use the default value or only minor reductions of this default value. The value
range is from 0 to 2347.
Distance：Target area distance.
IGMP Snooping：AP is a Layer 2 device when it is configured as Switch mode. However, IGMP
Snooping implementation on AP is a little bit different than that of standard Layer 2 Switch.