Phone System Data Services WHILE FREQUENCY FILTERING LIMITS THE DATA RATES POSSIBLE USING MODEMS, THE PHONE COMPANY'S INFRASTRUCTURE CAN HANDLE HIGH SPEED DIGITAL DATA. THE CONNECTIONS BETWEEN SWITCHES OFTEN USE FIBER WHICH CAN CARRY THOUSANDS OF TIMES THE DATA RATE OF A SINGLE MODEM. ONE CAN "LEASE" HIGH BANDWIDTH T1, T3, ..."CIRCUITS". TWISTED PAIR TO HOMES CAN HANDLE MORE THAN 56 KILOBITS PER SECOND IF FILTERS ARE TURNED OFF. PHONE COMPANY NOW OFFERS 128K BIT/SECOND "ISDN" (INTEGRATED SERVICES DIGITAL NETWORK) CONNECTIONS.

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This page is part of a section of lecture slides related to " Switching Techniques " within the topic "Multi-machine Networks". Other slides within this section and other sections of slides for the topic "Multi-machine Networks" can be accessed using the links below. Too Many Wires DIRECT CONNECTIONS Switching Techniques The Telephone Network The Telephone Network (cont.) Circuit Switching A Path through the Phone System Phone System Data Services Message Switching Message Switching (cont.) PACKET SWITCHING Comparing Switching Techniques Comparing Switching Techniques (cont.) THE NEED FOR "PROTOCOLS" Broadcast Networks Broadcast Networks "Bus" Networks "Bus" Networks (cont.) A More Familiar "Bus" Network CSMA/CD = Ethernet + Appletalk Collision Detection Backoff Protocols Ethernet Advantages Ring Networks Ring Networks = Simplified Switching Token Rings Token Passing Advantages and Disadvantages of Rings