Local networks are used for connecting computers over short distances (from hundreds of feet to several miles). In local networks, the choice of the physical layer depends on the choice of the link protocol, especially when considering three types of link protocols: Ethernet, Fast Ethernet, and Gigabyte Ethernet. The FDDI, Token Ring, and Arcnet protocols are not used widely.
Structured cables are a comprehensive solution to the low-voltage wiring in buildings. It involves, especially, phone and LAN wiring. The original idea of joining these cables with the fire and security signalization has been dropped, since the two will require different security measures.
LAN sockets, phone jacks, and other outlets are distributed in individual rooms within buildings. These connect to a patch panel placed in the building (see Figure 3.18). As for optical wiring, optical fibers connect to an optical distribution box.
Figure 3.22: Cabling in buildings
The patch panel and...