Draytek VigorSwitch P1085, Руководство пользователя, Страница: 257 / 267

VigorSwitch P1085 User’s Guide 249
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This chapter will tell you the basic concept of features to manage this switch and how they
work.
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Ethernet originated and was implemented at Xerox in Palo Alto, CA in 1973 and was
successfully commercialized by Digital Equipment Corporation (DEC), Intel and Xerox (DIX) in
1980. In 1992, Grand Junction Networks unveiled a new high speed Ethernet with the same
characteristic of the original Ethernet but operated at 100Mbps, called Fast Ethernet now.
This means Fast Ethernet inherits the same frame format, CSMA/CD, software interface. In
1998, Gigabit Ethernet was rolled out and provided 1000Mbps. Now 10G/s Ethernet is under
approving. Although these Ethernet have different speed, they still use the same basic
functions. So they are compatible in software and can connect each other almost without
limitation. The transmission media may be the only problem.
In the above figure, we can see that Ethernet locates at the Data Link layer and Physical layer
and comprises three portions, including logical link control (LLC), media access control (MAC),
and physical layer. The first two comprises Data link layer, which performs splitting data into
frame for transmitting, receiving acknowledge frame, error checking and re-transmitting
when not received correctly as well as provides an error-free channel upward to network
layer.