Network Devices
Hardware devices that are used to link computers, printers, fax machines and other network
devices to a network are called Network Devices. Such devices transmit data over the same
or different networks in a fast, safe and correct manner. Inter network or intra network can
be network devices.
Different types of network devices
Modem
Modem allows a computer to transmit or receive information over telephone or cable lines.
Data stored on the device is electrical, while only analog data can be transmitted via a
telephone line or cable wire.
The modem’s primary purpose is to convert the digital signal to analog, and vice versa. The
modem is a mix of modulator and demodulator modules. When the data is sent by the
computer, the modulator converts digital data into analog data. When the data is received by
the computer, the demodulator converts analog data signals to digital data.
Types of Modems
The modems can be classified in many ways, such as the direction in which data can be
transmitted, type of connection to the transmission line, transmission mode and etc.
Modems may be of these kinds, depending on the direction of data transmission: -
Simplex: - This modem can pass data from a digital device to a network (modulator) or a
network to a digital device (demodulator) in only one direction.
Half duplex: - This modem has a capacity to transmit data in both directions, but only one
at a time.
Full duplex: - This modem will simultaneously transmit data in both directions.
RJ45
The acronym for registered jack 45 is RJ45. The RJ45 connecter is an 8-pin jack that is used
by devices to physically connect LANs based on ethernet. Ethernet is a tool that specifies
protocols for setting up a LAN. Twisted pairs are the cables used by ethernet LANs and
have RJ45 connecter pins at both ends. On computers, these pins go into required socket
and connect the device to the network.
[Tutorialspoint, (2020).]
Repeater
