Cables and WiresBy Taufik, Eylisha, Jesslyn, Dzakiyyah, Sejoya, Raihan

Definition of Cables and Wires

A Cable is two or more wire twisted/braided together to form one cable.this

wires are conductors that are covered with insulators to prevent

electrocution.This wires are used to transfer electricity from one device to

another.

Modem A modem is a hardware device that connects the digital signals from a computer to an analog

telephone line. The sending modem modulates the data into a signal that is compatible with the phone line, and the receiving modem demodulates the signal back into digital data for the computer. This allows the signals to be transmitted longer distances than are normally possible.

Modem speeds at different years are shown below.

• 300 bps - 1960s through 1983

• 1200 bps - 1984 and 1985

• 9600 bps - 1991

• 56 Kbps - 1998

• ADSL (up to 8 megabits per second (Mbps)) – 1999

Modems normally respond to any call made to them when connected to an outside line and allow a connection. This may allow instant unsecured access to the network or the computers. If the modem is not really required, it should be disabled or removed from network work stations. If disabling the modem is not possible, it should be configured to prevent auto-answer.

Hubs

A common connection point for devices in a network. Hubs are commonly

used to connect segments of a LAN. A hub contains multiple ports. When

a packet arrives at one port, it is copied to the other ports so that all

segments of the LAN can see all packets.

Switches

Also called a switching hub, it is used

to connect a device to another in a

computer network. It is considered as

a more advanced version of hubs since

it just sends a message to the device

that requests it rather than

broadcasting it to every port.

Servers

A server is a system (software and

suitable computer hardware) that responds

to requests across a computer network to

provide, or help to provide, a network

service. Servers can be run on a dedicated

computer, which is also often referred to as

"the server", but many networked

computers are capable of hosting servers.

In many cases, a computer can provide

several services and have several servers

running.

Routers A router is connected to two or more

data lines from different networks.

When a data packet comes in one of

the lines, the router reads the address

information in the packet to

determine its destination. Then, using

information in its routing table

or routing policy, it directs the packet

to the next network on its journey.

Routers perform the "traffic directing"

functions on the Internet.