Psion Teklogix 9160 G2 Manual de usuario descargar pdf (Pagina 406)

100

101

D-56 Psion Teklogix 9160 G2 Wireless Gateway User Manual

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 CSMA/CA protocol.

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 MAC address, a control field with protocol version, frame type, frame sequence

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).

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 LAN can access the Internet, it needs to know the address of its default

gateway.

1 2 ... 401 402 403 404 405 406 407 408 409 410 411 ... 435 436

Comentarios a estos manuales

Sin comentarios

Psion Teklogix 9160 G2 Manual de usuario Pagina 406

Comentarios a estos manuales