Mbps Operation; Mobile Ip; Power Management - Intel PRO/Wireless 2011B LAN Product Reference Manual

without access points. The wireless computer starting the IBSS network (the first adapter
transmitting a beacon) determines the channel used for the computers in the IBSS network.
• Pseudo IBSS (Proprietary Ad Hoc) mode: Use this mode when the highest throughput is
required in an IBSS network to test performance. In Pseudo IBSS mode, each adapter is
required to be on the same channel. Pseudo IBSS is not recommended for devices operating on
battery power.
2.2

11 Mbps Operation

The Intel® PRO/Wireless 2011B LAN Adapter supports a maximum 11 Mbps data rate. The
adapter automatically changes to a 5.5, 2, or 1 Mbps data rate when unable to maintain a high
quality connection at 11 Mbps.
The following factors can dynamically alter the data rate:
• signal strength between the access point and the computer.
• the ratio of good transmitted packets to attempted transmitted packets falls below a threshold.
• the computer encounters an unspecified data rate or finds a higher transmit rate with another
access point.
2.3

Mobile IP

The Intel® PRO/Wireless 2011B LAN Adapter supports Mobile IP. The Mobile IP feature allows
Intel® PRO/Wireless 2011B LAN devices to roam across routers.
The computer retains its IP address when configured for Mobile IP and can:
• move from one IP subnet to another.
• move from an Ethernet segment to a wireless LAN.
• move from one Ethernet segment to another.
When the client moves to an access point on another subnet, mobile IP allows it to continue to
communicate as if it were on it's original subnet. Mobile IP uses a packet tunneling technique to
deliver data to the proper subnet. This additional overhead may result in slightly lower data
throughput than that seen on the "home" subnet.
2.4

Power Management

The WLAN adapter supports the Continuously Aware Mode (CAM) and Power Save Polling (PSP)
power-management modes. CAM requires the radio to remain on. Intel does not recommend CAM
for battery powered devices.
Intel® PRO/Wireless 2011B LAN Adapter Product Reference Guide
Chapter 2. About the Intel® PRO/Wireless 2011B LAN Adapter
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