ECT 250: Survey of e-commerce technology. Networking. Networking. In a network, communications equipment is used to connect two or more computers allowing the sharing of various hardware, software, and data resources. The basic components of a data communications
Binary information is represented by the presence
or absence of an electronic pulse. This is referred
to as digital signaling.
Some communications devices in place today were
designed for voice data which uses analog signals.
Data communications systems may use these
Sometimes called twisted pair, this media uses
wire pairs twisted together to form a cable. The
cable is then insulated.
Wire pairs are popular since this form of cabling
is already installed and available in most places
It is, however, susceptible to electrical interference,
In microwave transmission the signals are wireless
and can travel through the atmosphere.
Signals can, however, be blocked by the curvature
of the earth. (Line of sight transmission)
To prevent this, relay stations are located in high
areas and are used to retransmit data to other relay
A local area network is a collection of computers
that share hardware, software, and data over a
shorter geographical area than a WAN.
(Usually limited to a single building or compound).
A LAN can also be very small.
Example: LAN in my apartment contains one PC,
one printer, and two laptops.
A protocol is a set of rules for the exchange of
data across communication lines.
Because telecommunications systems use a wide
variety of hardware and software, protocols are
needed to coordinate communication.
What kinds of issues do protocols need to handle?