ENVS 1200 Lecture 15: ENVS 1200 Tutorial 15 Notes
13 May 2018
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ENVS 1200 Tutorial 15 Notes – Digital Analog
Introduction
• As you hopefully recall, data comes in many forms, both analog and digital.
• Similarly, there are both analog and digital signaling methods in use.
• The fundamental characteristics of both analog and digital signals and shows how the
channel manages different kinds of data with both kinds of signaling.
• It also considers the tradeoffs between different combinations of data and signaling.
• We look more closely at the nature of transmission media, identify specific media that
are commonly used, and discuss the relationship between the selection of a
communication channel medium and a signaling method.
• One of the most important technological concepts explained is the use of radio as a
medium for the transmission of digital data.
• Wireless data communication methods.
• A note: Overall, our focus is specific to networks and network interconnectivity.
• There are other types of communication channels, those used in traditional telephony,
for example, which are basically similar to those used in networks, but differ in the
details.
• While these are occasionally mentioned to clarify some of the concepts, they are
generally outside the scope of the discussion
• You will recall that a communication channel consists of a NIC transmitter that places a
signal from a sending node onto the channel
• A receiver that transfers the signal from the channel to the NIC of the receiving node, a
transmission signaling method, and a medium to carry the signal
• This is, of course, equally true for any type of channel.
• To refresh your memory reproduces the model of a communication channel shown
previously
• At this point, we remind you that the view of an end-to-end communication channel is
conceptual.
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