Nortel 2220, Product Manual

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Chapter 3 System Configuration 47
Using the Nortel Networks Wireless LAN Access Point 2220/2221
The DTIM is the interval between two synchronous frames with broadcast
information. If you set the value to 2, the access point saves broadcast and
multicast packets and forwards them after every second beacon. Having smaller
DTIM intervals delivers broadcast and multicast frames in a more timely manner;
however, by causing stations in Power Save mode to wake up more often, smaller
DTIM intervals drain power faster. Conversely, having higher DTIM values delays
the transmission of broadcast and multicast frames, but the larger DTIM intervals
reduces the power used by stations in Power Save mode. (Default: 5 Beacons)
RTS Threshold (0-2347)
Set the RTS (Request to Send) frame length. You may configure the access point
to initiate an RTS frame sequence always, never, or only on frames longer than a
specified length. If the packet size is smaller than the preset RTS threshold size,
the RTS/CTS mechanism will NOT be enabled
When the RTS/CTS mechanism is enabled, the access point sends Request to
Send (RTS) frames to a particular receiving station to negotiate the sending of a
data frame. After receiving an RTS frame, the station sends a CTS (Clear to Send)
frame to acknowledge the right of the sending station to send data frames. The
access points contending for the media may not be aware of each other. The RTS/
CTS mechanism allows other access points in the vicinity to see the CTS and
become quiet while the first access point transmits frames. (This mechanism
should be enabled on both the clients and the access points.) (Default: 2347)
Preamble Setting
The access points and client card drivers have a radio setting for RF Preamble. Set
it to short for better throughput; although this setting may cause interoperability
issues with some NICs. (Default: Long)