i have broadband connection upto 2mbps speed
ethernet card 100 mbps full duplex mode
broadband MODEM make - Dlink - GLB 502T
when i connect to ninternet each seconds its say network cable unpluuged
also i ping gateway its says that request time out in fraction of seconds

that's why i cannot connect to the internet properly
what is the problem it was modem or lan card problem

i change new network patch chord but still problem is there
Maybe you should change your network cable (between your compute and modem) and see if the problem disappears.For the record, full duplex is a pretty bad idea UNLESS you're connecting to a particularly clever managed network switch. Packet collisions are far more common and this can (ironically) slow down your network.rob, I disagree. Full duplex in an ethernet connection means that 2 wires are used for transmission and 2 for receiving. No collisions involved, because send and receive signals are on different wires. There could be collisions because of SIMULTANEOUS transmissions to the same host (many computers send messages to a single computer) but otherwise you can't have collisions between send and receive signals in the modern ethernet networks. You have 100 Mbps to send and 100 Mbps to receive, in the same time - if we consider wired ethernet 100 Mbps networks.

Half duplex... You can not send and receive messages (bits, datagrams, packets, name the protocol or layer of the protocol that describes that transmission) in the same time, there could be collisions between send and receive signals in half duplex mode. It is the "legacy Ethernet" that suffers from that problem, when there were used coaxial cables - when was used the same wire for sending and receiving the signal.

Collisions between the same type of signal are solved at the switch, you won't receive more signals from many computers in the same time. It is used the technique named "multiplexing" for WEAVING signals from different computers to create the illusion of multiple communications in the same time. At the destination computer it is used the technique called "demultiplexing" to separate the messages.

Wireless networks can't assure those characteristics. Many computers are able to send to a single computer and the access point can't do much about, and because of that the speed in the wireless networks drastically reduces with the increase of the number of computers "attached" to that wireless network.

Long discussion Quote from: Rob Pomeroy on January 11, 2008, 05:47:09 AM

For the record, full duplex is a pretty bad idea unless you're connecting to a particularly clever managed network switch. Packet collisions are far more common and this can (ironically) slow down your network.