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AT&T 555-025-201
DEFINITY® Communications System
Network and Data Connectivity
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CONTENTS _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ A AB BO OU UT T T TH HI IS S D DO OC CU UM ME EN NT T x xv vi ii i PREREQUISITE SKILLS AND KNOWLEDGE xvii DOCUMENT ORGANIZATION xvii HOW TO MAKE COMMENTS ABOUT THIS DOCUMENT xix 1 1. . I IN NT TR RO OD DU UC CT TI IO ON N T
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iv CONTENTS _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________ MULTIPLEXING OUTSIDE THE SWITCH 1-29 Multiplexing onto T1 Trunks 1-29 Compressing the Signal 1-31 Altering Cha
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CONTENTS v _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ Internal Dial Plan 2-8 Auxiliary Call Information 2-10 Automatic Alternate Routing 2-11 Automatic Route Selection 2-14 NETWORK ADMINISTRATION 2-17 PRIVATE NETWORK TRUNKS 2-17 NETWORKING FEATURE PARAMETERS 2-17 3 3. . T TA
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vi CONTENTS _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________ Automatic Route Selection 5-7 ETN INTERACTIONS WITH OTHER NETWORKS 5-7 Extension Number Portability Clusters 5
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CONTENTS vii _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ Parallel vs. Serial 7-6 Transmission Speed 7-6 Type of Communications Channel 7-7 SPECIAL DATA FEATURES 7-9 Terminal Dialing 7-9 Data Call Setup From a Voice Terminal 7-10 Computer Dialing 7-10 Data Hot Line 7-10 Data Pr
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viii CONTENTS _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________ The Communication System as a LAN Backup 8-20 PUBLIC AND PRIVATE DATA NETWORK CONNECTIONS 8-21 PUBLIC DATA N
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CONTENTS ix _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ USE OF GENERIC 2 AS A SYSTEM CLOCK REFERENCE B-29 USE OF GENERIC 1 AS A SYSTEM CLOCK REFERENCE B-30 C C. . T TR RU UN NK KI IN NG G T TE ER RM MS S A AN ND D C CA AP PA AB BI IL LI IT TI IE ES S C C- -1 1 D D. . C CO OM M
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x CONTENTS _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________ LIST OF FIGURES Figure 1-1. Analog-to-Digital Conversion 1-4 Figure 1-2. Transmission States for Voice Communic
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CONTENTS xi _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ Figure 6-3. Direct Link DCS Connections 6-5 Figure 6-4. Minimized Link Connections 6-6 Figure 6-5. DCIU/PI Linkage in a DCS Cluster 6-7 Figure 6-6. Short Haul Analog Signaling: System 75/G1 to System 75/G1 Via DSU 6-8 Fig
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xii CONTENTS _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________ Figure 8-9. Common ISN Configuration 8-18 Figure 8-10. LAN-to-LAN Connections Through the Switch 8-19 Figure 8
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CONTENTS xiii _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ Figure B-11. External and Internal Reference Levels B-19 Figure B-12. Nonpublic Network without Digital Switches B-20 Figure B-13. Proper Use of Backup Facilities B-21 Figure B-14. Improper Use of Backup Facilities B-22
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xiv CONTENTS _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________ LIST OF TABLES Table 1-1. Terminal/Port Compatibility 1-9 Table 1-2. Trunk Port Types 1-10 Table 1-3. Protoco
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CONTENTS xv _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ Table 8-8. Requirements for PBX-to-PBX Private Network Spectrum Connections 8-29 Table B-1. SCS References Switches B-10 Table D-1. Some CCITT Digital Standards D-6 Table D-2. Some CCITT Analog Standards D-7 Table D-3. So
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xvi CONTENTS _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________
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ABOUT THIS DOCUMENT _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ This document explains how to arrange two or more communications systems in a network. It also tells how to use your communications system to connect one data communications device or network to another device or
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xviii ABOUT THIS DOCUMENT _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________ PART I • Chapter 2 — Communications System Networking — An Overview— Introduces the networking s
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ABOUT THIS DOCUMENT xix _ _ ______________________________________________________________________________________ ______________________________________________________________________________________ _ ______________________________________________________________________________________ HOW TO MAKE COMMENTS ABOUT THIS DOCUMENT Reader comment cards are in the back of this document. While we have tried to make this document fit your needs, we are interested in your suggestions for improving it a
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xx ABOUT THIS DOCUMENT _ _ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________
