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Appendix D: Glossary
Frame
Legacy IEEE 802.11b devices cannot detect the ERP-OFDM signals used by IEEE 802.11g
stations, and this can result in collisions between data frames from IEEE 802.11b and IEEE
802.11g stations.
If there is a mix of 802.11b and 802.11g nodes on the same channel, the IEEE 802.11g
stations detect this via an ERP flag on the access point and enable request to send (RTS) and
clear to send (CTS) protection before sending data.
See also
F
Frame
A Frame consists of a discrete portion of data along with some descriptive meta-information
packaged for transmission on a wireless network. Each frame includes a source and
destination
number, frame body (with the actual information to be transmitted) and frame check
sequence for error detection. A Frame is similar in concept to a Packet, the difference being
that a packet operates on the Network layer (layer 3 in the OSI model) whereas a frame
operates on the Data-Link layer (layer 2 in the OSI model).
G
Gateway
A gateway is a network node that serves as an entrance to another network. A gateway also
often provides a proxy server and a firewall. It is associated with both a router, which use
headers and forwarding tables to determine where packets are sent, and a switch or bridge,
which provides the actual path for the packet in and out of the gateway.
Before a host on a
gateway.
D-56
Psion Teklogix 9160 G2 Wireless Gateway User Manual
CSMA/CA
protocol.
MAC
address, a control field with protocol version, frame type, frame sequence
LAN
can access the Internet, it needs to know the address of its default
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