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Appendix B: Specifications
Model Number SD205 5-Port 10/100 Switch
SD208 8-Port 10/100 Switch
SD216 16-Port 10/100 Switch
Standards IEEE 802.3, IEEE 802.3u
Ports
SD205 5 RJ-45 10/100
SD208 8 RJ-45 10/100
SD216 16 RJ-45 10/100
Cabling Type Category 5 Ethernet
LEDs
SD205 System, Port Status 1, 2, 3, 4, and 5
SD208 System, Port Status 1, 2, 3, 4, 5, 6, 7, and 8
SD216 System, Port Status 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, and 16
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Hub - The device that serves as the central location for attaching wires from
workstations. Can be passive, where there is no amplification of the signals; or
active, where the hubs are used like repeaters to provide an extension of the
cable that connects to a workstation.
Mbps (Megabits per second) - One million bits per second; unit of measure-
ment for data transmission.
MDI (Medium Dependent Interface) - On a network hub or switch, a MDI
port, also known as an uplink port, connects to another hub or switch using a
straight-through cable. To connect a MDI port to a computer, use a crossover
cable.
MDI-X (Medium Dependent Interface Crossed) - On a network hub or switch,
a MDI-X port connects to a computer using a straight-through cable. To con-
nect a MDI-X port to another hub or switch, use a crossover cable.
Network - A system that transmits any combination of voice, video and/or data
between users.
Switch - 1. A data switch connects computing devices to host computers,
allowing a large number of devices to share a limited number of ports. 2. A
device for making, breaking, or changing the connections in an electrical cir-
cuit.
Topology - A network’s topology is a logical characterization of how the
devices on the network are connected and the distances between them. The
most common network devices include hubs, switches, routers, and gateways.
Most large networks contain several levels of interconnection, the most impor-
tant of which include edge connections, backbone connections, and wide-area
connections.
UTP - Unshielded twisted pair is the most common kind of copper telephone
wiring. Twisted pair is the ordinary copper wire that connects home and many
business computers to the telephone company. To reduce crosstalk or electro-
magnetic induction between pairs of wires, two insulated copper wires are
twisted around each other. Each signal on twisted pair requires both wires.
Since some telephone sets or desktop locations require multiple connections,
twisted pair is sometimes installed in two or more pairs, all within a single
cable.
(130 pages)
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