Data to Signal
Data to Signal
Analog data translated into digital data and digital data
translated into analog data for processing is a staple of data communications.
The convergence of the digital world and analog world depends on the conversion
of both analog and digital data. Bandwidth, accuracy, noise and distortion
rejection, size, weight, and power consumption are among the crucial benchmarks
for the analog/digital conversions. Computer systems, routers, switches, and so
on, have or will have built-in coder-decoders (codec) and with DSL modems and
the like, it modulate-demodulate the
signal for airwave transmission. (Keller2009).
When transferring analog/digital data from one location to another,
the electronic equipment transmitting the signal, either using a physical
medium or using a wireless medium over the air, the electronic equipment determines
the type of signals the medium can transmit (Goleniewski 2001). Using the
example in Figure 1, a profile request moves from the computer workstation through
the corporate LAN to a DSL modem on to the Internet through another DSL modem
to retrieve the requested profile from a mainframe database.
Using a network application for
accessing the mainframe computer database of corporate profiles, the “request
for a profile” is sent. It is demonstrated in an ASCII condensed form as
“reque” as shown in Figure 2 and transmitted through the corporate LAN.
In this example, the LAN uses
differential Manchester encoding and is converted to a digital signal as it
travels over the LAN to another computer that is connect to the DSL modem (using
only the first letter, “R” for demonstration purposes and shown in Figure 3).
0 1 1 1
0 0 1 0
Figure 3. The
first letter of the message “R” using differential Manchester encoding.
The computer connected the DSL modem, converts data message
back to ASCII and transmits the string of ASCII on to the DSL modem. Utilizing
frequency modulation, the modem formulates a signal of the message for Internet
transmission. The frequency modulated signal travels to the appropriate ISP’s
gateway that converts it back to ASCII and on out onto the Internet. In this
example, Figure 1, it arrives are the DSL modem and is converted to ASCII and
into the mainframe database to retrieve a profile.
between two signals types, digital and analog are a fact of networks. Several
signals conversion takes place between the request and retrieval of a corporate
profile from a mainframe database as seen in Figure 1. Depending on the
equipment, analog and digital signal transmission takes place to retrieve the
profile. Whether analog or digital, the electronic exchange of data transforms
to signals for transmission.
(2001, December 28). Analog and digital transmission | Telecommunications
technology fundamentals. Informit.com. retrieved from
(2009). Signal conversion comes to grips with a network-centric world. Military
& Aerospace Electronics, 20(8), 22.