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Jerry, If it supported full-duplex, it was a switch. A "hub" is a common channel device, where every input is echoed to every output - in other words, a resistive bridge with amplifiers and impedance matching as needed. A card running full duplex into a hub would freeze the network. An Ethernet "switch", OTOH, is actually a router using MAC-layer addressing. It has buffers and intelligence adequate to the task of preventing collisions on the network, which speeds up Ethernet throughput dramatically: since each station enjoys it's own buffer space and a separate transmit vs. receive path, they can leave their transmitters on and thus avoid the performance hit caused by RTS/CTS delays and packet collisions. FWIW. Bill Jerry Feldman wrote: > The hub I had in my office at Raytheon supprted full and half duplex > operation. > bhorne wrote: > > > Not to rain on the parade, but I'll add a couple of caveats for those of us > > still in the dark ages of Ethernet: these apply ONLY to twisted pair > > operation, since coax is always half-duplex. > > > > 1. If your NIC is connected to other NICs through an Ethernet ** HUB **, use > > half-duplex. > -- > Jerry Feldman <gaf at blu.org> > Boston Linux and Unix user group > http://www.blu.org > > - > Subcription/unsubscription/info requests: send e-mail with > "subscribe", "unsubscribe", or "info" on the first line of the > message body to discuss-request at blu.org (Subject line is ignored). -- Bill Horne (Remove ".nouce" from address for direct replies. Sorry.) - Subcription/unsubscription/info requests: send e-mail with "subscribe", "unsubscribe", or "info" on the first line of the message body to discuss-request at blu.org (Subject line is ignored).
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