DATA COMMUNICATION Lecture-31.

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Presentation transcript:

DATA COMMUNICATION Lecture-31

Recap of Lecture 30 Time Division Multiplexing Asynchronous TDM Inverse Multiplexing The Telephone System

Overview of Lecture 31 The Telephone System Analog Services Digital Services Fiber To The Curb (FTTC)

Telephone System North American telephone system includes many common carriers Local companies and long-distance providers

Telephone System

Telephone Services Analog services: Analog network and FDM Digital services: Digital network and TDM For now, both types of services are available

Telephone Services

Analog Services Switched service and leased services Sensitive to noise and other forms of interference

Analog Services

Analog Switched Service The familiar dial-up service Local loop: Two-wire connection between the subscriber’s handset and the network The network is called PSTN (Public Switched Telephone Network)

Analog Switched Service

Analog Leased Service Offers a dedicated line, that is permanently connected to another customer The connection still passes through the PSTN, but no dialing is needed

Analog Leased Service

AT&T’s Analog Hierarchy

Digital Services Less sensitive than analog services to noise Less expensive than analog services

Digital Services

Switched/56 Service Switched digital service - data rate up to 56 Kbps Subscribers need DSU instead of modem

Switched/56 Service DSU (Digital Service Unit) Changes the subscriber’s rate to 56 Kbps Encodes the data in the format used in the network

Switched/56 Service

Digital Data Service Digital leased line with a maximum data rate of 64 Kbps DDS also requires the use of a DSU

Digital Data Service

DS Hierarchy

T Lines Telephone companies use T lines to implement the DS services DS-0 is not actually offered as a service

T Lines Service Line Rate(Mbps) Voice channels -------------------------------------------------------- DS-1 T-1 1.544 24 DS-2 T-2 6.312 96 DS-3 T-3 44.736 672 DS-4 T-4 274.176 4032

Summary The Telephone System Analog Services Digital Services Fiber To The Curb (FTTC)

Suggested Reading Section 8.5, “Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan