Using Telephone and Cable Networks for Data Transmissions

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Presentation transcript:

Using Telephone and Cable Networks for Data Transmissions 01204325: Data Communication and Computer Networks Asst. Prof. Chaiporn Jaikaeo, Ph.D. chaiporn.j@ku.ac.th http://www.cpe.ku.ac.th/~cpj Computer Engineering Department Kasetsart University, Bangkok, Thailand Adapted from lecture slides by Behrouz A. Forouzan © The McGraw-Hill Companies, Inc. All rights reserved

Outline Telephone lines Dial-up modems Digital Subscriber Line (DSL) Cable TV networks

Telephone Lines Traditional telephone lines can carry frequencies between 300 and 3300 Hz Giving them a bandwidth of 3000 Hz All this range is used for transmitting voice A great deal of interference and distortion can be accepted without loss of intelligibility

Telephone Line Bandwidth

stands for modulator/demodulator. Dial-Up Modems Modem stands for modulator/demodulator.

V.32 and V.32bis

56K Modems

Digital Subscriber Line (DSL) Provides higher-speed access to the Internet Supports high-speed digital communication over the existing local loops The existing local loops can handle bandwidths up to 1.1 MHz.

ADSL ADSL – Asymmetric Digital Subscriber Line Downstream bit rate > upstream bit rate Designed for residential users Unsuitable for businesses ADSL operates on existing local loops Local loops can handle up to 1.1 MHz of bandwidth The distance limit is ~18,000 feet The system uses a data rate based on the condition of the local loop line

Bandwidth Division in ADSL

Discrete Multi-Tone Modulation Or DMT

Bandwidth Division 4Khz Allocation and modulation of each channel are determined adaptively

Bandwidth Division Voice – Channel 0 Idle – Channels 1-5 Upstream – Channels 6-30 24 data channels, 1 control channel 1.44 Mbps (max) upstream bit rate Actual bit rate: 64 Kbps to 1 Mbps Downstream – Channels 31-255 224 data channels, 1 control channel 13.4 Mbps (max) downstream bit rate Actual bit rate: 500 Kbps to 8 Mbps

ADSL Customer Residence

DSL Access Multiplexer Or DSLAM

Other DSL Technologies HDSL – High-bit-rate DSL VDSL – Very-high-bit-rate DSL SDSL – Symmetric DSL ADSL2 ADSL2+ See also http://en.wikipedia.org/wiki/Digital_subscriber_line Source: AWARE. ADSL2 and ADSL2+ The new ADSL standard.

Cable TV Networks Started as a video service provider, then moved to the business of Internet access Communication is simplex

Hybrid Fiber-Coaxial Network Or HFC Bidirectional communication is achieved

Data Transfer over CATV Division of coaxial cable band by Cable TV Theoretical downstream data rate is 30 Mbps Theoretical upstream data rate is 12 Mbps

Cable Modem

Cable Modem Transmission System Or CMTS

Fiber To The X Optical broadband network architectures Fiber-to-the-node Fiber-to-the-curb Fiber-to-the-building Fiber-to-the-home Source: Wikipedia