ConnectGear gs-1124 User Guide

 

This chapter will tell you the basic concept of features to manage this switch 

and how they work.  

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. 

 

 

 
 

Fig. 3-1 IEEE 802.3 reference model vs. OSI reference mode 

 

In Fig. 3-1, 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.