DIGITAL DATA TRANSMISSION - I

... Keying) The circuit is build as shown in figure below. The input sine wave is multiplied by a pulse generator, which can be used as a digital data bit. Figure 5 B –II (a) ASK On-off keying ... carrier sine wave. These techniques give rise to amplitude-shift- keying (ASK), frequency-shift-keying (FSK) and phase-shift-keying (PSK), respectively. ASK describes the technique the carri...

Ngày tải lên: 19/10/2013, 17:15

... EXPERIMENT 6 DIGITAL DATA TRANSMISSION - II SUBMITTED BY B. Theoretically,optimum spacing i. e maximum d would occur when ρ is at it’s maximum negative i. e at ρ = -1 .In the experiment ... Signal : FSK involves frequency shifting a carrier between known fixed frequencies to convey digital data. Normally, FSK modulation is achieved using just two frequenci...

Ngày tải lên: 23/10/2013, 15:15

Ngày tải lên: 29/09/2013, 20:20

Ngày tải lên: 29/09/2013, 20:20

... Transmission Why Securing Data Transmission Is Important Common Vulnerabilities to Data Transmission Practice: Analyzing Risks to Data Transmission How to Determine Security Requirements ... determine security requirements for data transmission: 1. Analyze business and technical requirements for securing data transmission. Your organization may have specific secur...

Ngày tải lên: 18/01/2014, 05:20

... digital data  Modem  Can use digital signal to carry analog data  Compact Disc audio Analog Signals Carrying Analog and Digital Data Digital Signals Carrying Analog and Digital Data ... overcome  Noise is not amplified Advantages of Digital Transmission  Digital technology  Low cost LSI/VLSI technology  Data integrity  Longer distances over lower quali...

Ngày tải lên: 16/02/2014, 08:20

... interference and distortion can be accepted without loss of intelligibility. be accepted without loss of intelligibility. Modem Standards Topics discussed in this section: Topics discussed in ... bandwidth 9.15 Figure 9.9 Uploading and downloading in 56K modems 9.16 9-3 DIGITAL SUBSCRIBER LINE 9-3 DIGITAL SUBSCRIBER LINE After traditional modems reached their peak data rate, Aft...

Ngày tải lên: 16/02/2014, 20:20

... CSN200 Introduction to Telecommunications, Winter 2000 Lecture-22 Digital Transmission Digital Transmission of Analog Data (Baseband Transmission) : • Analog voice data must be translated into ... modulation or the use of coded pulses for the transmission of analog information represents a basic application of digital communications. Sampling: • It is an operation t...

Ngày tải lên: 09/12/2013, 16:15

... Reduce ISI  Efficient bandwidth utilization  Robustness to timing error (small side lobes) Lecture 6 10 The raised cosine filter  Raised-Cosine Filter  A Nyquist pulse (No ISI at the sampling ... error:  Inter-symbol interference (ISI)  Nyquist theorem  The techniques to reduce ISI  Pulse shaping  Equalization Lecture 6 4 Inter-Symbol Interference (ISI)  ISI in the detection process...

Ngày tải lên: 18/10/2013, 06:15

... Extension. The FIO-01 Digital I/ O Extension module The FIO-01 is a general purpose digital input/output extension. It offers 4 bidirectional digital inputs/outputs and 2 electromechanical relays. FIO-01 ... layout STATUS RO1NO RO1COM RO1NC X65 X64 COM DIO4 RO2NO RO2COM RO2NC X66 X63 COM DIO3 X62 COM DIO2 X61 COM DIO1 321 321 21212121 CHASSIS DIGITAL IO EXTENSION FIO-01 Diagnosti...

Ngày tải lên: 20/10/2013, 02:15