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Public Switched Telephone Network (S-PSTN). S-PSTN nPartial support for this curriculum material was provided by the National Science Foundation's Course,

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Presentation on theme: "Public Switched Telephone Network (S-PSTN). S-PSTN nPartial support for this curriculum material was provided by the National Science Foundation's Course,"— Presentation transcript:

1 Public Switched Telephone Network (S-PSTN)

2 S-PSTN nPartial support for this curriculum material was provided by the National Science Foundation's Course, Curriculum, and Laboratory Improvement Program under grant DUE and Advanced Technological Education Program under grant DUE nGWEC EDUCATION PARTNERS: This material is subject to the legal License Agreement signed by your institution. Please refer to this License Agreement for restrictions of use.

3 Table of Contents Overview 5 Learning Objectives 6 Network Overview 7 Switching Systems 13 Post-Divestiture Network 19 Signaling 28 Contributors 38

4 Overview nNetwork setup nSwitching systems nPost-Divestiture network nSignaling nSS7 nCCS

5 Learning Objectives After completing this module you will be able to: nDiscuss the basic operations of the Public Switched Telephone Network (PSTN) nDefine the telephony switching hierarchy nDescribe the signaling required to complete a typical telephone call through the PSTN nDescribe how the SS7 network is overlayed onto the PSTN

6 Network Overview

7 What Is A Network ? Switching Office CPE Transmission Facilities Switching Office

8 Public Switched Telephone Network (PSTN) Major Components of the Public Switched Telephone Network (PSTN): n Switching Offices n Transmission facilities n Customer Premise Equipment (CPE)

9 Switching Offices CONTROL NETWORK SWITCHING OFFICE

10 Transmission Facilities Switching Office Switching Office Trunks Line Special Service Circuit

11 Customer Premise Equipment (CPE) Customer Premise Equipment (CPE) is the term used to identify any piece of equipment supplied by the customer to interface with the PSTN. Examples include: n Single Line Telephone Set n Modems or Data Sets n Private Branch Exchange (PBX)

12 Switching Systems

13 Traffic Networks nThe Public Switched Telephone Network: qPre-divestiture qPost-divestiture

14 Local Network Structure Exchange Area 5 Exchange Area 4 Exchange Area 3 Exchange Area 2 Exchange Area 1 Wire Center A Wire Center B

15 Typical Local Network Tandem Office T Wire Center A Wire Center B Wire Center C Tandem Trunk Groups (Final) Direct Trunk Groups (High Usage)

16 Toll Network Structure Pre-Divestiture Telephone 1Telephone 2 Regional Center D Class 1 Regional Center C Class 2 Regional Center B Class 3 Toll Center A Class 4 FINAL Regional Center E Sectional Center F Primary Center G HU6 HU5 HU4 HU3 HU2 HU1 FINAL Toll Center H Toll Connecting Local Office (End Office) Class 5 Local Tandem Office HU7 Toll Connecting

17 Toll Network Structure Pre-Divestiture Regional Center D Class 1 Regional Center C Class 2 Regional Center B Class 3 Toll Center A Class 4 FINAL Regional Center E Sectional Center F Primary Center G HU6 HU5 HU4 HU3 HU2 HU1 FINAL Toll Center H Toll Connecting Local Office (End Office) Class 5 Local Tandem Office Telephone 1Telephone 2 HU7 Toll Connecting

18 The Post- Divestiture Network

19 The Post-1984 Network IEC1 IEC2 IEC3 LATA x InterLATA Carriers LATA y

20 Typical LEC Network Tandem OfficeCentral Office Switching Systems Interoffice Facilities/Trunks Distribution Facility/Local Loop Distribution Facility/Local Loop LEC IC IC POP

21 LATA Access Services nSwitched Access nSpecial Access (Nonswitched)

22 Switched Access Service nFeature Group A nFeature Group B nFeature Group C nFeature Group D nEqual Access End Office

23 North American Numbering Plan Numbering Plan Area Central Office Station N X X N X X X X X X

24 Number Plan Area (NPA) These special purposes codes include: NXX Reserved Codes:N11 Reserved Codes: 600 Used in Canada for TWX (teletype service) 700 Assigned to ICs 800, 888, 877, and 866 Service (INWATS) 900 Service (DIAL-IT Service) 311 Non-Emergency Police and Fire 411 Local Directory Assistance 611 Repair Service* 811 Business Office* 911 Emergency Number

25 Number Plan Area (NPA) Interchangeable area (or NPA) codes are NPA codes of the format NXX. By changing from the former N-0/1-X format to the NXX format, the maximum number of assignable NPA codes increased by 640 codes as shown: Old Format New format N 0/1 X 8 x 2 x 10 = 160 N X X 8 x 10 x 10 = * = 152 *Excluding codes of N11 format 800-8* = 792* *Excluding codes of N11 format

26 International Numbering If you have made international calls, you know that the familiar NANP is a subset of the ITU international plan. Until recently, international numbers were limited to 12 digits. 1, 2 or 3 digits Varies by location Country Codes Trunk Code Local Code Subscriber Number

27 Signaling

28 Signaling is the generation, transmission, and reception of information needed to direct and control the setup and disconnect of a call.

29 Signaling Originating CPE Terminating Switching Office Terminating CPE Originating Switching Office Off-hook Dial Tone Dialed Digits Off-hook Off-hook (wink) On-hook (wink) Dialed Digits Audible Ring Ringing AnswerOff-hook Disconnect Idle 123

30 Signaling Terminating Switching Office Originating CPE Terminating Switching Office Terminating CPE Originating Switching Office Off-hook Dial Tone Dialed Digits Off-hook Off-hook (wink) On-hook (wink) Dialed Digits Audible Ring Ringing AnswerOff-hook Disconnect Idle

31 Signaling Terminating Switching Office Originating CPE Terminating Switching Office Terminating CPE Originating Switching Office Off-hook Dial Tone Dialed Digits Off-hook Off-hook (wink) On-hook (wink) Dialed Digits Audible Ring Ringing AnswerOff-hook Disconnect Idle

32 Signaling Originating CPE Terminating Switching Office Terminating CPE Originating Switching Office Off-hook Dial Tone Dialed Digits Off-hook Off-hook (wink) On-hook (wink) Dialed Digits Audible Ring Ringing AnswerOff-hook Disconnect Idle

33 Common Channel Signaling (CCS) Common Channel Signaling (CCS) is a signaling method that uses a separate dedicated channel to send and receive signaling information for a group of trunks or facilities by means of labeled messages.

34 Signaling System 7 (SS7) LINKS A A A A A A A A EE F F CO DD BB BB C C STPSTP STPSTP STPSTP STPSTP SCP

35 SS7 Switching Office A Switching Office B Customer A STP Customer B IAM ACM ANM REL RLC

36 Network Administration, Maintenance and Services nNetwork Management nTraffic Measurements nBilling nMaintenance nCustomer Services


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