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Updated 12/20011 Emerged Technologies Signaling System Seven – SS7 Nirmala Shenoy Information Technology Department Rochester Institute of Technology.

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Presentation on theme: "Updated 12/20011 Emerged Technologies Signaling System Seven – SS7 Nirmala Shenoy Information Technology Department Rochester Institute of Technology."— Presentation transcript:

1 updated 12/20011 Emerged Technologies Signaling System Seven – SS7 Nirmala Shenoy Information Technology Department Rochester Institute of Technology

2 updated 12/20012 Signaling System 7 Purpose –A Signaling Network Exclusively Telephone networks Can be used for ISDN Setting up and clearing call Providing special services Can operate on any link

3 updated 12/20013 Signaling System 7 Topology Uses SS7 components, STP, SSP, SCP

4 updated 12/20014 Signaling System 7 Topology Subscriber lines are connected to Service Switching Points – SSP Perform call processing on behalf of user Implemented at end offices Source and destination of SS7 messages

5 updated 12/20015 Signaling System 7 Topology STP – Signaling Transfer points Translating SS7 messages Routing messages Basic function – relaying between SSP, STP, SCP – layer 3

6 updated 12/20016 Signaling System 7 Topology SCP – Service Control Point Software & databases for call management –800 call services – eg –Receive queries and send responses Components may be co-located

7 updated 12/20017 Signaling System 7 Layers – MTP 1 –Message Transfer Part 1 Physical Layer Electrical attributes, Connectors datails Support for digital and analog links

8 updated 12/20018 Signaling System 7 Layers – MTP 2 –Message Transfer Part 2 Data Link layer Transfer of traffic between SS7 components Similar to HDLC

9 updated 12/20019 Signaling System 7 Layers – MTP 3 –Message Transfer Part 3 – layer 3 Network management Message routing, Route discovery, Routing around Flow control Message distribution

10 updated 12/200110 Signaling System 7 Layers – SSCP –Signaling Connection Control Point – layer 3 Support connection oriented or connectionless Translate addresses –SS7 identifiers

11 updated 12/200111 Signaling System 7 Layers – ISUP –ISDN User Part Transmit call control between SS7 nodes Works in conjunction with ISDN Q.931 Translates Q.931 messages for use in SS7 network

12 updated 12/200112 Signaling System 7 Layers – TCAP –Transaction Capabilities Application Part – layer 7 –Various use 800 number transfer support Syntax definition between communicating components

13 updated 12/200113 Signaling System 7 Layers – OMAP & ASE –OMAP Network Management –ASE User Specific Services support

14 updated 12/200114 Signaling System 7 PDUs –Link Layer transfers messages of variable length signal units (SUs) –MSU – Message Signal Unit Transfers the actual signaling message – LSSU Link Status Signal Unit –FISU Fill-in Signal Unit Provide layer 2 control and status signaling

15 updated 12/200115 Signaling System 7 Conclusions –Has been a huge success –Applied in different types of networks Telephone, ISDN, GSM, Satellite signaling Operate with some of the emerging technologies

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