The document discusses the architecture of Common Channel Signaling System #7 (CCSS #7). It covers the history and components of CCSS #7, including the Message Transfer Part (MTP layers), Signaling Connection Control Part (SCCP), Transaction Capabilities Application Part (TCAP), and other layers. It also discusses the Public Switched Telephone Network (PSTN) architecture and how wireless networks connect to the PSTN using the CCSS #7 infrastructure.
Nghiên cứu về mạng neural Convolutional, áp dụng vào bài toán nhận dạng đối tượng trong lĩnh vực thị giác máy tính. Ngày nay, trong kỷ nguyên số, máy tính là một phần không thể thiếu trong nghiên cứu khoa học cũng như trong đời sống hàng ngày. Tuy nhiên, do hệ thống máy tính dựa trên lý thuyết cổ điển (tập hợp, logic nhị phân), nên dù có khả năng tính toán lớn và độ chính xác cao, thì máy tính cũng chỉ có thể làm việc theo một chương trình gồm các thuật toán được viết sẵn do lập trình viên chứ chưa thể tự lập luận hay sáng tạo.
A complete power point presentation to know how Public Switching Telephone Network works. Useful for those in the working field or for the ones who want to know more or submitting any project report..
Nghiên cứu về mạng neural Convolutional, áp dụng vào bài toán nhận dạng đối tượng trong lĩnh vực thị giác máy tính. Ngày nay, trong kỷ nguyên số, máy tính là một phần không thể thiếu trong nghiên cứu khoa học cũng như trong đời sống hàng ngày. Tuy nhiên, do hệ thống máy tính dựa trên lý thuyết cổ điển (tập hợp, logic nhị phân), nên dù có khả năng tính toán lớn và độ chính xác cao, thì máy tính cũng chỉ có thể làm việc theo một chương trình gồm các thuật toán được viết sẵn do lập trình viên chứ chưa thể tự lập luận hay sáng tạo.
A complete power point presentation to know how Public Switching Telephone Network works. Useful for those in the working field or for the ones who want to know more or submitting any project report..
Nhận viết luận văn đại học, thạc sĩ trọn gói, chất lượng, LH ZALO=>0909232620
Tham khảo dịch vụ, bảng giá tại: https://vietbaitotnghiep.com/dich-vu-viet-thue-luan-van
Download luận văn đồ án tốt nghiệp ngành điện công nghiệp với đề tài: Nghiên cứu và khai thác hệ thống dẫn đường bằng vệ tinh GPS, cho các bạn làm luận văn tham khảo
Nhận viết luận văn Đại học , thạc sĩ - Zalo: 0917.193.864
Tham khảo bảng giá dịch vụ viết bài tại: vietbaocaothuctap.net
Download luận văn tóm tắt ngành công nghệ thông tin với đề tài: Thiết kế mạng và phân tích hiệu suất của mạng cảm biến không dây cho giám sát sức khỏe, cho các bạn làm luạn văn tham khảo
X.25 is a packet-switched network, developed by ITU-T as an interface between data terminal equipment DTE and data circuit-terminating equipment DCE for terminal operation in packet mode on public data network. It is an end-to-end protocol, but actual movement of packet through the network is invisible to the user.The user sees the network as a cloud through which each packet passes on its way to the receiving DTE.
It defines how a packet-mode terminal can be connected to a packet network for exchange of data. It describes procedures necessary for establishing, maintaining and terminating connections. It uses virtual network approach to packet switching, SVC and PVC and uses asynchronous TDM to multiplex data...
Cisco CCNA Training/Exam Tips that are helpful for your Certification Exam!
To be Cisco Certified please Check out:
http://asmed.com/information-technology-it/
Nhận viết luận văn đại học, thạc sĩ trọn gói, chất lượng, LH ZALO=>0909232620
Tham khảo dịch vụ, bảng giá tại: https://vietbaitotnghiep.com/dich-vu-viet-thue-luan-van
Download luận văn đồ án tốt nghiệp ngành điện công nghiệp với đề tài: Nghiên cứu và khai thác hệ thống dẫn đường bằng vệ tinh GPS, cho các bạn làm luận văn tham khảo
Nhận viết luận văn Đại học , thạc sĩ - Zalo: 0917.193.864
Tham khảo bảng giá dịch vụ viết bài tại: vietbaocaothuctap.net
Download luận văn tóm tắt ngành công nghệ thông tin với đề tài: Thiết kế mạng và phân tích hiệu suất của mạng cảm biến không dây cho giám sát sức khỏe, cho các bạn làm luạn văn tham khảo
X.25 is a packet-switched network, developed by ITU-T as an interface between data terminal equipment DTE and data circuit-terminating equipment DCE for terminal operation in packet mode on public data network. It is an end-to-end protocol, but actual movement of packet through the network is invisible to the user.The user sees the network as a cloud through which each packet passes on its way to the receiving DTE.
It defines how a packet-mode terminal can be connected to a packet network for exchange of data. It describes procedures necessary for establishing, maintaining and terminating connections. It uses virtual network approach to packet switching, SVC and PVC and uses asynchronous TDM to multiplex data...
Cisco CCNA Training/Exam Tips that are helpful for your Certification Exam!
To be Cisco Certified please Check out:
http://asmed.com/information-technology-it/
Hacking Telco equipment: The HLR/HSS, by Laurent GhigonisP1Security
HLR and HSS are the most important Telecom Equipment in an Operator Core
Network.
We are going to see that this so-called “Critical Infrastructure” is not
as robust as you could think, by exploring the some weaknesses of the
HLR/HSS equipment.
Plan:
* Virtualization of HLR/HSS, for instrumentation purposes
* HLR/HSS system analysis
* SS7/Diameter network fuzzing
* HLR/HSS binaries reverse
Worldwide attacks on SS7/SIGTRAN networkP1Security
Publication performed by Alexandre De Oliveira and Pierre-Olivier Vauboin during Hackito Ergo Sum 2014
Mobile telecommunication networks are complex and provide a wide range of services, making them a tempting target for fraudsters and for intelligence agencies. Moreover, the architecture, equipment and protocols used on these networks were never designed with security in mind, availability being the first concern. Today, even though some telecom operators are investing money into securing their network, events confirm that for most of them maturity in term of security is yet to come, as recently shown with the example of massive traffic interception on compromised SCCP and GRX providers like Belgacom’s BICS. Here we present the most typical and legitimate telecom callflows from making a mobile phone call to sending a SMS. Then we describe the protocol layers involved and how to abuse them, which fields can be manipulated in order to attack both the operator infrastructure and its subscribers. Finally, we show a real life example of scan performed from an international SS7 interconnection and practical attacks on subscribers such as spam, spoofed SMS and user location tracking.
Watch the first 10 minutes of the video below and then answer the que.pdfdeepakarora871
Watch the first 10 minutes of the video below and then answer the questions that follow.
https://d2m81 yxg6b9itc.cloudfront.net/flex- insidethe internet/processed/1969-02-06-
BasicOperationOfMTS- small.7db4fb40447611 e4bf68d70a95093c06 The Michigan terminal
system using a modem and a POTS connection. What are the advantages of this over a leased
line installation? What is the difference between connectionless and connection-oriented
networking?
Solution
4. The Michigan Terminal System:
The Michigan Terminal System (MTS) is one of the first time-sharing computer operating
systems. Developed in 1967 at the University of Michigan for use on IBM S/360-67, S/370 and
compatible mainframe computers, it was developed and used by a consortium of eight
universities in the United States, Canada, and the United Kingdom over a period of 33 years
(1967 to 1999).
The software developed by the staff of the University of Michigan\'s academic Computing
Center for the operation of the IBM S/360-67, S/370, and compatible computers can be described
as a multiprogramming, multiprocessing, virtual memory, time-sharing supervisor that handles a
number of resident, reentrant programs.
There is a large subsystem, called MTS (Michigan Terminal System), for command
interpretation, execution control, file management, and accounting.
There are Michigan terminal system are using a several Modems and POTS connections.
Advantage of this over a leased line installation:
Michigan Terminal Systems are used a leased line is Private circuit. A leased line is a private
bidirectional or symmetric telecommunications line between two or more locations provided in
exchange for a monthly rent.
Sometimes known as a private circuit or data line in the UK
The Michigan Terminal System are many leased networks. Leased lines are used to build up
private networks, private telephone networks (by interconnecting PBXs) or access the internet or
a partner network (extranet).
· Site to site PBX connectivity
· Site to network connectivity
· International private leased circuit
Site to site data connectivity:
Terminating a leased line with two routers can extend network capabilities across sites. Leased
lines were first used in the 1970s by enterprise with proprietary protocols such as IBM System
Network Architecture and Digital Equipment DEC net, and with TCP/IP in University and
Research networks before the Internet became widely available. The other Layer 3 protocols
were used such as Novell IPX on enterprise networks until TCP/IP became ubiquitous in the
2000s. Today on words point to point data circuits are typically provisioned as either TDM,
Ethernet, or Layer 3 MPLS.
Site to site PBX connectivity:
Terminating a leased line with two PBX allowed customers to by-pass PSTN for inter-site
telephony. The customers to manage their own dial plan (and to use short extensions for internal
telephone number) as well as to make significant savings if enough voice traffic was carried
across the line
Site .
Independent LTE networks for major resources projectsComms Connect
Outlining the benefits and operational advantages that converged communications platforms offer to the efficiency and autonomy of major projects, proving that remoteness of the site is not necessarily a disadvantage.
Simon Lardner, Director, Challenge Networks & Telecommunications Consultant
The principle and characteristics of GSM and NB-IoT
In this paper, we first analyze the principle and characteristics of GSM and NB-IoT, study the NB-IoT coverage enhancement methods, and compare and analyze the coverage capability of GSM and NB-IoT.
Each cell has a number of carrier frequencies, and each carrier frequency has eight-time slots, which means that eight basic physical channels are provided. In the wireless subsystem, the physical channels support the logical channels, and the physical channels are mapped to different logical channels according to the types of messages transmitted on the physical channels.
IoT technologies are mainly in the areas of communication and sensors. This article is about IoT technology NB-IoT vs LoRa technology.
What is the classification of IoT communication technology?
There are many wireless communication technologies for IoT, mainly divided into two categories: one is Zigbee, Wi-Fi, Bluetooth, Z-wave, and other short-range communication technologies; the other is LPWAN (low-power Wide-Area Network), i.e. wide-area network communication technology.
LPWAN can be further divided into two categories: one is LoRa, SigFox, and other technologies working in the unlicensed spectrum; the other is 2G/3G/4G cellular communication technologies working in licensed spectrum and supported by 3GPP, such as EC-GSM, LTE Cat-m, NB-IoT, etc.
IoT technologies are mainly in the areas of communication and sensors. This article is about IoT technology NB-IoT vs LoRa technology.
What is the classification of IoT communication technology?
There are many wireless communication technologies for IoT, mainly divided into two categories: one is Zigbee, Wi-Fi, Bluetooth, Z-wave, and other short-range communication technologies; the other is LPWAN (low-power Wide-Area Network), i.e. wide-area network communication technology.
LPWAN can be further divided into two categories: one is LoRa, SigFox, and other technologies working in the unlicensed spectrum; the other is 2G/3G/4G cellular communication technologies working in licensed spectrum and supported by 3GPP, such as EC-GSM, LTE Cat-m, NB-IoT, etc.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
6. 12/15/09 Some Basic Concepts to Understand the Common Channel Signaling System
7. 12/15/09 Signaling has always played a very important role in the field of communication, since it provide the means for the information interchange between two or more nodes within a network. The way of performing signaling has evolved together with the evolution of the transmission equipment and of the used switching systems. Both of them were originally analog evolved into digital and now it is optical. The term signaling, when used in telephony, refers to the exchange of control information associated with the establishment of a telephone call on a telecommunications circuit. SIGNALING
8. 12/15/09 CLASSIFICATION OF SIGNALING Topological Classification Functional Classification UNI Signaling System NNI Signaling System Line Signaling Register Signaling
9.
10. 12/15/09 FUNCTIONAL CLASSIFICATION At least two types of information will always have to be “signaled” between adjacent points: Line Signaling = The intention to seize or to release a local line (in case of UNI signaling) or a trunk circuit (in case of NNI signaling). Register Signaling = The call destination (under the form of dialed digits) will have to be passed from the register of the previous step to the register of the next exchange.
11. 12/15/09 IN-BAND : In this signaling the control information and user information are send on a single line. OUT-BAND: In this signaling the control information and user information are send separately into logically or physically separate paths. IN-BAND AND OUT-BAND SIGNALING
12. 12/15/09 SIGNALING MODES The term “Signaling mode” refers to the association existing between the path taken a signaling message. Associative Mode In this mode, signaling points are directly connected by means of signaling links. In other words , direct link interconnecting the two points. Non-Associative Mode In this mode, two signaling points do not have to be directly connected by a signaling link. The signaling information can be sent via multiple STP’s (signaling transfer point). Since message can be routed indirectly, multiple paths become available between two signaling points.
13. 12/15/09 Quasi Associative Mode It is a limited case of the Non-Associative mode where the path taken by the message through the CCS #7 networks is the same for each message, pertaining to the same call. In this way a correctly sequenced delivery of all the information is guaranteed. Because of these two reasons, CCS #7 is specified for use in the Associated and in the Quasi-Associated modes only.
14. 12/15/09 What is the Common Channel Signaling System #7 (CCSS #7)? CCS #7 is an advanced, digital signaling and control system, that is a set of telephony si g naling protocols w hich are used to set up most of the w orld's telephone calls. With a hi g h performance packet based communication protocols. standardized b y ITU-TS ( International telecommunication Union and Telecommunication standardization ) in the 1980’s .
15. 12/15/09 What about the naming, Common Channel Signaling System #7 (CCSS #7)? It is usually abbreviated to SS#7 and also SS7 , though in North America it is often referred to as CCSS#7 , an acronym for " C ommon C hannel S ignaling S ystem #7". In some European countries, specifically the United Kingdom, it is sometimes called C7 ( CC ITT number 7) and is also known as number 7 and CCIS7 . (ITU-T was formally known as CC ITT).
16. 12/15/09 What are the features of Common Channel Signaling System #7 (CCSS #7)? It is totally O ut-Band. It is message oriented. It support the common channel. It is easy to understand and implement because of it’s layered approach. It is also very futuristic because any new feature or services can be added very easily.
17. 12/15/09 HISTORY OF CCSS#7 Common channel signaling protocols have been developed by AT&T, BT and the ITU-T since 1975 and the first international Common Channel Signaling protocol was defined by the ITU-T as Signaling System #6 in 1977. Signaling System #7 was defined as an international standard by ITU-T in its 1980. SS5 and earlier used In-Band signaling, where the call-setup information was sent by playing special multi-frequency tones into the telephone lines. This led to security problems. SS6 and SS7 moved to a system in which the signaling information was out-band, carried in a separate signaling channel. This avoided the security problems.
18. 12/15/09 COMING OF STANDARD It was necessary to provide telecommunications standards that would create the compatibility necessary to provide end-to-end communications between international networks without regard to the nation of origin. CCITT (Consultative Committee on International Telephone and Telegraph) The task of establishing standards was undertaken by the International Telecommunications Union, which is a United Nations Treaty organization. The IT assembled a group known as the CCITT the result of their deliberations was Common Channel Interoffice Signaling System #6, first introduced in the 60s. Were there five previous versions? Of course. But only CCSS 6 survived to deployment.
19. 12/15/09 Recently, the CCITT group name has been changed to the Telecommunication Standardization Sector (TS) and groups responsible for radio communications (RS) have been added. The use of the term CCITT is rapidly being replaced by ITU-TS. There is only one international SS7 protocol defined by ITU-T. There are however, many national variants of the SS7 protocols. Most national variants are based on two widely deployed national variants as standardized by ANSI and ETSI, which are in turn based on the international protocol defined by ITU-T. Each national variant has its own unique characteristics. Some national variants with rather striking characteristics are the China (PRC) and Japan (TTC) national variants.
20. 12/15/09 OBJECTIVES AND APPLICATIONS SS7, being a high-speed and high-performance packet-based communications protocol, can communicate significant amounts of information when setting up a call, during the call, and at the end of the call. This permits rich call-related services to be developed. Some of the first such services were call management related services that we take for granted today: Call forwarding (busy and no answer), voice mail, call waiting, conference calling,
21. 12/15/09 called name and number display, call screening, malicious caller identification, busy callback, etc. calling name and number display,
22. 12/15/09 That is optimized for operational in digital telecommunications networks with stored programmed controlled exchanges. CCS #7 is optimized for operation over 64 kb digital channels. It is also suitable for operation over analog channels and at lower speeds. It is suitable for point to point terrestrial on satellite links. That can meet the present and future requirements for call control, remote control, and management and maintenance signaling. Maintenance of small local exchange can be carried out remotely from a network service center. ADVANTAGES
23. 12/15/09 PSTN Network Architecture Wireless Network Architecture TOPICS WILL BE COVERED
24. 12/15/09 The public switched telephone network ( PSTN ) is the network of the world's public circuit switched telephone networks, in much the same way that the Internet is the network of the world's public IP-based packet-switched networks. Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital, and now includes mobiles as well as fixed telephones. The PSTN is largely governed by technical standards created by the ITU-T, and uses E.163/E.164 addresses (more commonly known as telephone numbers ) for addressing PSTN ARCHITECTURE AND CONTEXT
25. 12/15/09 GROUP 8 COMPONENTS OF THE PSTN A switch capable of making connections for the transmission lines that enter the building. For a local office most of these will be the lines that go to homes and offices and end at a telephone or, perhaps, at an office switchboard is called as a Local Exchange Office or simply known as End Offices .
26. 12/15/09 A switch whose main purpose would be the interconnection of many local offices. The local switch, then, would not need a transmission line to every other local office. Instead, transmission lines going directly to the intermediate Switch would be sufficient.
27. 12/15/09 Taking our example one step further, the Tandem offices can be connected to another switch whose job is to connect switches. In this case the new switch would likely be a switch for long distance communication. Under previous FCC rules, this switch would be owned and maintained (or leased) by a long distance carrier or Interexchange Carrier (IXC).
30. 12/15/09 WIRELESS NETWORK ARCHITECTURE AND CONTEXT The truth is that the wireless network is truly “wireless” in only a small portion of its architecture. A mobile telephone transmits and receives to and from a transmitter/receiver. The transmitter/receiver is the first and last place in the network where the communications are wireless. The voice received from the mobile telephone must be connected into the PSTN. The voice received from the PSTN must end up connected to the transmitter for transmission to the telephone.
31. 12/15/09 The wireless company needs a switch to connect a call originating or terminating at their customer in the same way that the landline phone company needs an end office switch. An easy way to illustrate this is to show it side by side with an earlier drawing we used to illustrate the End Office part of the PSTN.
32. 12/15/09 COMPONENTS OF THE WIRELESS NETWORK The MSC needs “one foot” in the PSTN (Public Switched Telephone Network) and “one foot” in the SS7 (Signaling System #7) network. Landline connections must be made to connect the callers. Information pertaining to the call must be sent to the PSTN switches using the services of the SS7. The MSC then has requirements that PSTN switches do not have. Among these is the need to keep track of its subscribers. When the subscriber is within the range of any of the MSC’s transmitter/ receivers, the MSC receives an indication of the signal strength of the subscriber’s telephone at the location of the antennas.
34. 12/15/09 The MSC connects the antennae receiving the strongest signal. If the subscriber is “on the move” during the conversation, the signal will gradually weaken at one antennae while strengthening at another. The MSC is smart enough to know that transient conditions (such as passing under a Bridge) will have an effect on this balance.
36. 12/15/09 CCSS #7 NETWORK CCSS#7 clearly splits the signaling planes and voice circuits. An SS7 network has to be made up of SS7-capable equipment from end to end in order to provide its full functionality. The network is made up of several link types (A, B, C, D, E, and F) and three signaling nodes – Service Switching point (SSPs), Singling Transfer Point (STPs), and Service Control Point (SCPs). Each node is identified on the network by a number, a point code. Extended services are provided by a database interface at the SCP level using the SS7 network.
37. 12/15/09 COMPONENTS OF THE SS7 NETWORK STP (Signal Transfer Point) The “knots” that hold the network together. These nodes serve to provide network access to other nodes (by connection with Access Links). STPs transfer messages around the network. STPs maintain routing tables for the purposes of directing messages to their intended destinations .
38. 12/15/09 SSP (Service Switching Point) The Service Switching Point is a switch associated node which handles call set-up and has the ability to stop call processing, make queries of even unknown databases, and perform actions appropriate to the response. In general, the SS7 messages which originate or terminate here are either circuit or call routing related.
39. 12/15/09 SCP (Service Control Point) In general, Service Control Points provide access to databases. These nodes are the residences of processes which can access the database, extract the required data and return it to the node requesting the data. The database(s) to which the SCP has access may or may not reside at the same location as the SCP. The same capabilities that allow the SCP to access databases lend themselves to other uses such as providing access to an IP.
40. 12/15/09 IP (Intelligent Peripheral) The IP is the residence of processes which manage resources such as signaling sensors and voice response equipment. The resource management capabilities become available to switches on demand, thereby freeing switch locations from the need to equip with a myriad of such devices, and providing highly efficient use of both aging and up-to-date technologies.
41. 12/15/09 CRP (Customer Routing Point) The CRP provides on-premises control of the routing information requested by switches for translation of 800 type dialing (not limited to 800 numbers). The operator of the CRP is a customer who requires rapid update and control of the translation of their own numbers.
42. 12/15/09 HLR/VLR ( Home Location Register/Visitor Location Register) A database that contains customer information about local subscribers is maintained by each provider. This is the Home Location Register. Another company will access this information when a “roamer” appears, and use the data for an entry into its Visitor Location Register.
43. 12/15/09 Network links Links are simply the connections to establish the whole Network. The different types of links are as follows: A ccess L inks Link a node (Signaling Point) to a local STP pair. B ridge L inks Link two pairs at the same level (local/local, regional/regional).
44. 12/15/09 C ross L inks Link two STPs together to form an STP pair. D iagonal L inks Link a local STP pair to a higher level STP pair. E xtended L inks Link a node (Signaling Point) to a remote STP pair. F ully Associated L inks Link two associated nodes together
52. 12/15/09 The OSI model accepted by the ITU-T in 1980 offers a structured approach to the problem of data Communication. Since CCS #7 is in fact nothing more than a particular kind of data communication system (used for the signaling purposes), a very similar structuring with respect to the OSI model can be found. This similarity is very high for the MTP part, though it becomes more difficult and inexact for the higher layers. CCSS #7 AND OSI MODEL
55. 12/15/09 Layered Approach of CCS #7 In order to cope with the changing environment, a very flexible signaling system is required, which can perform signaling functions for all kinds of telecomm applications, already existing, or even future applications yet to be defined. To provide this type of flexibility in CCS #7, a modular and layered structure is adopted. The functional principle of CCS #7 is the division of functions into a “Message Transfer Part”, that is also called “network services part” on one hand and separate “User Parts”, that is just an “application and functionality part” on the other hand.
56.
57. 12/15/09 MTP-LEVEL 1 (PHYSICAL LAYER) MTP1 represents the physical layer. This is, the layer that is responsible for the connection of SS7 Signaling Points into the transmission network over which they communicate with each other. Primarily, this involves the conversion of messaging into electrical signal and the maintenance of the physical links through which these pass. That means it deals with physical issues at the level of links, interface cards, multiplexers etc.
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59. 12/15/09 MTP-LEVEL 2 (DATA LINK LAYER) This is a busy MTP part. It monitors the links and reports on their status. It checks messages to ensure their integrity (both incoming and outgoing). It discards bad messages and requests copies of discarded messages. It tests links before allowing their use. MTP2 provides error detection and sequence checking, and retransmits unacknowledged messages. MTP2 uses packets called signal units to transmit SS7 messages. While MTP-1 will transmit the messages from exchange to exchange. MTP-2 provides reliable transfer of signaling messages between 2 directly connected SP’s. it makes sure that the message is free of errors and that no information will lost during transmission.
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62. 12/15/09 MTP-LEVEL 3 (NETWORK LAYER) The functions of level 3 are divided into two major categories. One of these is Message Routing (or Signaling Message Handling). The other is Signaling Network Management. Network Management can be further broken down into four sub-categories.
63. 12/15/09 Signaling Message routing functions : These functions ensure that the signaling message originated by a particular User part are delivered to the same User part at the destination signaling point. Message Discrimination : In this type of functionality, it answers the question “Is this message is intended for this SP?” if yes then go for distribution . Message Distribution: In this type of functionality, it answers the question “For which user part is it intended?”. All messages handed off to level 3 (by either a higher or lower level) are either en route to the application via level 4 user parts (SCCP, ISDNUP, TUP, etc.) or they are en route to the adjacent node via level 2 and the SS7 signalling links.
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67. 12/15/09 THE TCAP The Transaction Capabilities Application Part offers its services to user designed applications as well as to OMAP (Operations, Maintenance and Administration Part). TCAP is used largely by switching locations to obtain data from databases (SSP from 800 Db, MSC from HLR, etc.), or to Invoke features at another switch (like Automatic Callback or Automatic Recall). It also provide the supports for roaming conditions using HLR(Home Location Register) and VLR(Visitor Location Register). Remember that TCAP uses the services of the SCCP which in turn uses the services of the MTP.
68. 12/15/09 ISDN USER PART (ISUP) ISUP is used throughout the PSTN to provide the messaging necessary for the setup and teardown of all circuits, both voice and digital. Wireless networks also make use of ISUP to establish the necessary switch connections into the PSTN. ISUP messages are sent from each switch to the switch where the next circuit connection is required. ISUP offers two types of services, known as Basic and Supplementary . Basic Services consist of those services employed in the process of setting up and tearing down a call. Supplementary Services consist of those services employed in passing all messages that may be necessary to maintain and/or modify the call.
70. 12/15/09 TELEPHONE USER PART (TUP) It is a part formerly employed largely in Europe to help implement switch connections. It is called the T elephone U sers P art (TUP), and it has been used in Europe in ways resembling the use of the Integrated Services Digital Network in the U.S. Nevertheless, the use of ISDNUP (or at least the circuit control functionalities commonly called ISUP) is replacing TUP worldwide. Some holdouts (such as China) still use TUP. The Telephone User Part supports the setup and release of telephone calls.