Most personal computers come without a network adapter installed because there are so many choices. Ethernet also comes in less popular bus styles, using coaxial cable to interconnect the computers at 10 Mbps. 10BaseT wiring and 10Base2 coax must be installed specifically for data networking. The advantage of these types of networks is that new wiring may be avoided that will save a significant amount of expense and time to install. Moreover, installed wiring in the small office is a type of leasehold improvement that is usually at the lessee's expense and no compensation is given when the lease expires or the lessee moves to other quarters.
Wired networks can usually pay for themselves if used for three or more years.
Less use may justify wireless or phone-line networks. A minor disadvantage over wired alternatives is that these networks typically do not operate at 10 Mbps, but at a lower data rate of from 1 to 2 Mbps. Newer 802.11 networks will operate at speeds up to 11 Mbps, but at a steep increase in equipment cost. Installing a network adapter is no more difficult than installing a modem, internal Zip drive, or other add-on device. However, if you are uncomfortable with opening your computer case, you should have a technician install your network adapters.