D-Link 48-Port 10/100Mbps Web-Smart Switch with 4-Port 10/100/1000Base-T and 2-Port Combo SFP..., Руководство пользователя

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Switching Technology
Another approach to push beyond the limits of Ethernet technology is
the development of switching technology. A switch bridges Ethernet
packets at the MAC address level of the Ethernet protocol transmitting
among connected Ethernet or Fast Ethernet LAN segments.
Switching is a cost-effective way of increasing the total network
capacity available to users on a local area network. A switch increases
capacity and decreases network loading by dividing a local area
network into different segments, which won’t compete with each other
for network transmission capacity.
The switch acts as a high-speed selective bridge between the
individual segments. The switch, without interfering with any other
segments, automatically forwards traffic that needs to go from one
segment to another. By doing this the total network capacity is
multiplied, while still maintaining the same network cabling and
adapter cards.
Power over Ethernet (PoE)
Power over Ethernet (PoE) integrates power and data onto one single
cabling infrastructure, eliminating the need to have AC power
available at all locations.
Power and Data are integrated onto the same cable. Supporting
category 5/5e up to 100 Meters, PoE will provide power to PoE
compatible devices, such as IP telephones, wireless LAN access
points, and IP security cameras.