ZyXEL Communications ZyWall ATP series User Manual page 602

Table 246 Configuration > Object > AP Profile > Add/Edit Radio Profile (continued)
LABEL DESCRIPTION
Guard Interval This field is available only when the channel width is 20/40MHz or 20/40/80MHz.
Set the guard interval for this radio profile to either Short or Long.
The guard interval is the gap introduced between data transmission from users in order to
reduce interference. Reducing the interval increases data transfer rates but also increases
interference. Increasing the interval reduces data transfer rates but also reduces
interference.
Enable A-MPDU Select this to enable A-MPDU aggregation.
Aggregation
Message Protocol Data Unit (MPDU) aggregation collects Ethernet frames along with their
802.11n headers and wraps them in a 802.11n MAC header. This method is useful for
increasing bandwidth throughput in environments that are prone to high error rates.
A-MPDU Limit Enter the maximum frame size to be aggregated.
A-MPDU Enter the maximum number of frames to be aggregated each time.
Subframe
Enable A-MSDU Select this to enable A-MSDU aggregation.
Aggregation
Mac Service Data Unit (MSDU) aggregation collects Ethernet frames without any of their
802.11n headers and wraps the header-less payload in a single 802.11n MAC header. This
method is useful for increasing bandwidth throughput. It is also more efficient than A-MPDU
except in environments that are prone to high error rates.
A-MSDU Limit Enter the maximum frame size to be aggregated.
RTS/CTS Threshold Use RTS/CTS to reduce data collisions on the wireless network if you have wireless clients
that are associated with the same AP but out of range of one another. When enabled, a
wireless client sends an RTS (Request To Send) and then waits for a CTS (Clear To Send)
before it transmits. This stops wireless clients from transmitting packets at the same time
(and causing data collisions).
A wireless client sends an RTS for all packets larger than the number (of bytes) that you
enter here. Set the RTS/CTS equal to or higher than the fragmentation threshold to turn RTS/
CTS off.
Beacon Interval When a wirelessly networked device sends a beacon, it includes with it a beacon interval.
This specifies the time period before the device sends the beacon again. The interval tells
receiving devices on the network how long they can wait in low-power mode before
waking up to handle the beacon. A high value helps save current consumption of the
access point.
DTIM Delivery Traffic Indication Message (DTIM) is the time period after which broadcast and
multicast packets are transmitted to mobile clients in the Active Power Management
mode. A high DTIM value can cause clients to lose connectivity with the network. This value
can be set from 1 to 255.
Enable Signal Select the check box to use the signal threshold to ensure wireless clients receive good
Threshold
throughput. This allows only wireless clients with a strong signal to connect to the AP.
Clear the check box to not require wireless clients to have a minimum signal strength to
connect to the AP.
Station Signal Set a minimum client signal strength. A wireless client is allowed to connect to the AP only
Threshold
when its signal strength is stronger than the specified threshold.
-20 dBm is the strongest signal you can require and -76 is the weakest.
Disassociate Set a minimum kick-off signal strength. When a wireless client's signal strength is lower than
Station Threshold
the specified threshold, the Zyxel Device disconnects the wireless client from the AP.
-20 dBm is the strongest signal you can require and -90 is the weakest.
Allow Station Select this option to allow a wireless client to try to associate with the AP again after it is
Connection after
disconnected due to weak signal strength.
Multiple Retries
Chapter 34 Object
ZyWALL ATP Series User's Guide
602