Information Technology Reference
In-Depth Information
10Base2 Thinnet
Commonly referred to as Thinnet, this specification uses 0.2 inch, 50 ohm coaxial cable.
Thinnet specifications are as follows:
0.2 inch, RG58-U, 50 ohm coax cable.
Maximum segment length is 185 m.
Maximum number of attachments per segment is 30.
Minimum separation per segment is 0.5 m.
T-connectors attach workstations.
Figure 4-9 shows a sample 10Base2 Ethernet network.
Sample 10Base2 Network
Figure 4-9
T connectors
0.2 inch coaxial cable
Terminator
10BaseT Ethernet
UTP has become the defacto standard media for LAN systems. 10BaseT was made an IEEE
standard in 1990. The 10BaseT specifications are as follows:
24 AWG UTP .4/.6 mm cable.
Maximum segment length is 100 m.
1 device per cable.
Fast Ethernet
The IEEE developed the 802.3U standard in 1995 to provide Ethernet speeds of 100 Mbps over
UTP and fiber cabling. The 100BaseT standard is similar to 10 Mbps Ethernet in that it uses
CSMA/CD, runs on Category 3, 4, and 5 UTP cable, and the frame formats are preserved.
Connectivity still uses hubs, repeaters, and bridges.
The encoding for 100BaseT is 4B/5B with nonreturn to zero (NRZ), the new speed is 100 Mbps,
and the media independent interface (MII) was introduced as a replacement to the attachment
unit interface (AUI).
 
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