Signals, Digital data, Modulation Overview

Question 1

What is analog?

Answer 1

Use of electricity to transmit data by creating a continuous and constantly varying wave.
Complex and unpredictable

Question 2

What is digital

Answer 2

Electrical impulses to transmit data in a discontinuous stream of on and off pulses.

Question 3

What are the 3 types of digital datas?

Answer 3

Synchronous, Asynchronous, Isochronous

Question 4

what is Synchronous data?

Answer 4

data transmitted at a rate determined by an associated clock

Question 5

What is Asynchronous data?

Answer 5

data transmitted without an associated clock usually during low transmission. Receiving equipment detects data using the start and stop bits.
Parity bit for error checks

Question 6

What is Isochronous data?

Answer 6

data without associated clock and without start and stop bit that uses ovesampling

Question 7

What are handshaking signals?

Answer 7

dedicated lines used to coordinate data transfer.
Used to signal ready/not ready, to acknowledge or request.

Question 8

What do the acronyms RT and CTS mean?

Answer 8

Request to Send and Clear to Send

Question 9

What is audio frequency?

Answer 9

A current having a frequency such that if applied to a transducer(speaker) will produce acoustic waves within range of human hearing.
requires a medium( air, water, or conductive wire) because can’t travel through space.
Requires a transmitter and a receiver.
Not an electromagnetic wave

Question 10

What is immediate frequency?

Answer 10

deals directly with satellite