AT&T 2500 series, 7100 series, 7200 series, 7300 series, 7400 series, 7500 series

2-20 COMMUNICATION SYSTEM NETWORKING — AN OVERVIEW

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Contents

Main Page CONTENTS Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page TRANSMISSION TYPES ANALOG TRANSMISSION DIGITAL TRANSMISSION 1-4 Figure 1-1. Analog-to-Digital Conversion ANALOG VS. DIGITAL Page TRANSMISSION STATES VOICE TRANSMISSION Entering the Switch 1-8 Figure 1-2. Transmission States for Voice Communication Exiting the Switch 1-10 Table 1-2. Trunk Port Types 1-12 Figure 1-3. Transmission States for Data Transmission Protocols Used 1-14 Page MULTIPLEXED COMMUNICATION TYPES OF MULTIPLEXING Frequency-Division Multiplexing Time-Division Multiplexing Statistical Multiplexing MULTIPLEXING OVER DS1 FACILITIES Line Coding Page Signal Inversion 1-22 Table 1-7. Data-Module Capabilities (Continued) TABLE 1-7:Data-Module Capabilities (Part 2 of 2) 1-24 Figure 1-7. D4 Framing Framing Signaling 1-26 Page MULTIPLEXING OUTSIDE THE SWITCH Multiplexing onto T1 Trunks 1-30 Compressing the Signal Altering Channel Assignments on T1 Trunks Getting the Signal Ready for the Central Ofce Changing the Transmission Medium from Metallic to Fiber-Optic Multiplexing with Microwave Demultiplexing Figure 1-10. Possible Multiplexed Connections STATISTICAL MULTIPLEXING Page Tie Trunks Special-Access Trunks Auxiliary Trunks Page System 75/G1 Administration DS1 Options INTERFACE CIRCUIT TRUNK TABLES Page Page Page Page Page Page Page Page Page Page 2. COMMUNICATION SYSTEM NETWORKING AN OVERVIEW Page Page Page Page Page Page Page Page Figure 2-3. ARS Processing Page 2-18 Table 2-2. Network Administration Terminals and Systems Page Page 3. TANDEM TIE TRUNK NETWORKS Page 4. MAIN-SATELLITE/TRIBUTARY (MS/T) NETWORKS THROUGH THE UDP OR MULTIPREMISES PACKAGES Page Page Figure 4-3. Dialing Patterns From Tributary or Satellite to Main Figure 4-4. Dialing Patterns From Main to Satellite or Tributary 4-6 Figure 4-5. Dialing Patterns From Main to Tandem Figure 4-6. Dialing Patterns From Satellite or Tributary to Tandem Page Page 5. ELECTRONIC TANDEM NETWORK (ETN) THROUGH THE ETN AND PNA PACKAGES Page Figure 5-1. Typical 2-Level Hierarchical Electronic Tandem Network (ETN) Conguration 5-6 Figure 5-3. Private Network Uniform Numbering Plan Page Page 5-10 Page Page Page Page 6. DISTRIBUTED COMMUNICATIONS SYSTEM (DCS) Page Page Page Figure 6-3. Direct Link DCS Connections 6-6 Figure 6-4. Minimized Link Connections Page Page DISTRIBUTED COMMUNICATIONS SYSTEM (DCS) 6-9 Figure 6-7. Long Haul Analog Signaling: System 75/G1 to System 75/G1 Via Modem Figure 6-8. Long Haul Digital Signaling: System 75/G1 to System 75/G1 Via AVD DS1 Figure 6-9. Long Haul Digital Signaling: System 75/G1 to System 75/G1 Via ISDN PRI 6-10 Figure 6-11. Short Haul Analog Signaling: System 85/G2 to System 85/G2 Via DSU DISTRIBUTED COMMUNICATIONS SYSTEM (DCS) 6-11 Figure 6-12. Long Haul Analog Signaling: System 85/G2 to System 85/G2 Via Modem Figure 6-13. Long Haul Digital Signaling: System 85/G2 to System 85/G2 Via ISDN PRI 6-12 System 75 or Generic 1 (G1) to System 85 or Generic 2 (G2) Figure 6-16. Long Haul Analog Signaling: System 75/G1 to System 85/G2 Direct Via Modem Figure 6-15. Short Haul Analog Signaling: System 75/G1 to System 85/G2 Direct Via DSU DISTRIBUTED COMMUNICATIONS SYSTEM (DCS) 6-13 Figure 6-17. Long Haul Digital Signaling: System 75/G1 to System 85/G2 Via AVD DS1 Figure 6-18. Long Haul Digital Signaling: System 75/G1 to System 85/G2 Via ISDN PRI Page Page Page Page Page Page Page Page Page Page 7. DATA CONNECTIVITY AN OVERVIEW Page Figure 7-1. Possible Data Connections Page Page Page Page 7-10 Table 7-1. Data Feature vs Communications Systems Data Services Features Page 7-12 Figure 7-5. Off-Premises Data-Only Extension Congurations Page Page DTE CONNECTIONS DTE COMPATIBILITY Protocol Converters Terminal Emulators PC/PBX or PC/ISDN DCE POSSIBILITIES Data Modules ADUs Page Page Page MODEM POOLING CONNECTIONS Figure 8-3. External Modem Pool Using Intelligent Modems (Hayes-compatible) Figure 8-4. Integrated Modem Pool 8-12 Figure 8-5. Modem Pooling over a DS1 Channel LOCAL AREA NETWORK CONNECTIONS LAN TOPOLOGY LAN PROTOCOL ADVANTAGES OF A COMMUNICATIONS SYSTEM IN A LAN ENVIRONMENT Communication Between the LAN and Outside DTEs Page Page Communication Between the LAN and Other Networks Page The Communication System as a LAN Backup PUBLIC AND PRIVATE DATA NETWORK CONNECTIONS PUBLIC DATA NETWORKS Packet-Switched Public Data Networks Circuit-Switched Public Data Networks 8-24 Table 8-6. Requirements for Connections from the PBX to SDS/SDDN Figure 8-15. Domestic Public Switched Data Network with ISDN-PRI Facilities (Modes 0, 1, 2, 3) Figure 8-16. International Public Switched Data Network with ISDN-PRI Facilities (Modes 0, 1) PRIVATE DATA NETWORKS Terrestrial Private Data Network Links Table 8-7. Requirements for PBX-to-PBX Private Network T1.5 and T45 Connections Page Page Satellite Private Data Network Links TELEMARKETING HOST CONNECTIONS THE ISDN GATEWAY THE INTEGRATED TELEMARKETING GATEWAY 8-32 Figure 8-22. Telemarketing Gateway Conguration Page Page DATA NETWORK ADMINISTRATION Page Page Figure 9-1. Dedicated/Permanent Switched Connections Congurations (Sheet 1-or-2) 9-4 Figure 9-1. Dedicated/Permanent Switched Connections Congurations (Sheet 2-of-2) Page Page Page 9-8 Figure 9-5. A Possible Imaging Conguration Figure 9-6. A Possible FAX Conguration A. RELATED DOCUMENTS Page Page Page Page Page Page Page Page Page B. SYNCHRONIZATION OF DIGITAL FACILITIES Page Page Page Page Page Page Page Page Page Page Page Page Figure B-9. External-Clock Interface Figure B-10. External-Clock Duplicated Synchronization Page Page Page Page Page Page Page Page Page Page Page Page Page C. TRUNKING TERMS AND CAPABILITIES Page Page Page Page Page Page Page Page Page Page Page Page TRUNKING CHARACTERISTICS TABLE Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page D-6 Table D-1. Some CCITT Digital Standards Table D-2. Some CCITT Analog Standards (Continued) D-8 TABLE D-2. Some CCITT Analog Standards (Continued) Table D-3. Some CCITT ISDN Standards Page D-10 Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page ABBREVIATIONS Page Page Page Page Page GLOSSARY Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page INDEX

AT&T - page 92

Models: 2500 series 7100 series 7200 series 7300 series 7400 series 7500 series