Abstract
Content
- Introduction
- 1. Relevance of the topic
- 2. The purpose and objectives of the study
- 3. Architecture and network topology
- Conclusion
- References
Introduction
In the global information society have the following requirements for telecommunication network:
- Management of large volumes of information flows;
- Solving the urgent problems of packet switching;
- The rejection of traditional services to provide voice-only services;
- The single information space.
Thus, there is a need to promote the concept of NGN, which provided a common infrastructure, and thus lower costs, the use of packet increased flexibility and adaptability of the network is able to send any kind of traffic. The result of merging the Internet and telephone networks, combines their best features. NGN should be broadly universal communication medium that provides the user access to as many services.
1. Theme urgency
In the city of Shymkent, at the time of design, there is no operator is able to satisfy the demand for access to integrated broadband services, with the possibility of a painless buildup, so you need to deploy NGN network.
2. Purpose and research problems
The purpose of the project - providing subscribers Shymkent integrated broadband services with the required
level of quality of service through network design concept for NGN.
- To analyze the object and the existing telecommunications infrastructure for it;
- Develop an information network model;
- Calculated on the basis of traffic and calculation to choose technology, topology, and the types of communication lines;
- Select network equipment and assess the qualitative characteristics of designed network.
3. Architecture and network topology
Based on the analysis of interaction nodes core technologies NGN concluded that the SIP protocol is best suited to implement network services «tripleplay», as the most efficient architecture uses IP-network data, Furthermore, the architecture for VoIP networks the basis of this protocol has a high level of scalability.
The most effective technology for building next-generation access networks in Shymkent to provide services Tr³plePlay is Ethernet. The technology has a good economic performance, the minimum limits of technology and enables a growing kit offered to subscribers.
As vehicle technology is supposed to use IP / MPLS based on 10 GigabitEthernet in the optical network DWDM. The topology of the network - the "star". The network must have the scalability and flexibility. Communication channels must store throughput.
The network architecture should be based on a 3-tier model, which includes the following components: the level of service (server), the level of control (softswitch), line (10 Gbit / s), the level of (1 Gbit / s), the access level (100 Mbit / s).
The deep penetration of optics to provide high-quality broadband services.
As the core router best option is to use CiscoCRS-January 8-10GBE and 16-GBE, supporting 10 GigabitEthernet. For four nodes generating maximum subscriber traffic 65 Gbit / s, only one switch core, the minimum configuration (one bar).
The maximum load of the one core node is 17.6 Gbit / s. The load on the Internet link to the "outside world" - 21111.23 Mbit / s, the load on the channels of PSTN - 301,125 Mbit / s per channel from servers IPTV + VoD - 258 Mbit / s. Thus the access level from the subscribers should be provided with access speed of 10 Mbit / s. At the level of access switches - up to 1 Gbit / s. At the core capacity of the ring should provide the bandwidth 30-50 Gb / s. External Internet link - 30 Gbit / s, the outer channel to the PSTN - 500 Mbit / s.
Fig. 1 is a diagram showing the architecture of the proposed next generation network for the conditions of Shymkent. Given in Fig. 1 device SoftSwitch - is not only one of the network devices. It is also a network architectural solution.
Signaling gateway (SG) - delivers a signal to the SoftSwitch information received from the PSTN and vice versa.
Transport gateway (TG) - it receives user information flows from the PSTN, it converts the information into packets and transmits it to the IP protocol with the packet-switched network, and does it all running SoftSwitch.
Access Gateway (AG) - an interface between the IP-network and a wired or wireless access network transmits signaling information to the SoftSwitch, converts user information and transmits it to another port, or the same IP network, or other packet-switched network, or to transfer gateway for onward transmission to the PSTN.
To join the Softswitch segments of modern telephone networks based on VoIP servers are used. Since there are currently two technologies VoIP-SIP (SessionInitiationProtocol) and H.323 in the Softswitch includes SIP-servers and H.323 servsry. These servers communicate with the MGC SIP/SIP2 signaling protocols and H.323 respectively.
As the switch third level is selected CiscoCatalyst 6509 modules WS-X6704-10GE and WS-X6416-GBIC, since in any node in the network has a large number of access switches.
As the switch is selected Cisco BTS 10200. Cisco BTS 10200 is klassonezavisimym telephone network switch. It serves as the intelligent call management, establishment, management, routing and termination of voice calls over a packet network via VoIP media gateways command.
Important for the developed network is the assessment of its quality characteristics. One of these characteristics is to delay the transmission of voice traffic.
Image 1 - The architecture of the next generation network for the city of Shymkent
(Animation: 10 shots, 7 cycles of repetition, 140 KB)
To analyze the most complex cases, the total packet delay in passing from the node with the subscribers of the industrial sector to the node with the subscribers housing sector is designed for codecs G.711 and G.723. As a result, the total delay for IP-telephony network for the G.711 codec is 123 ms, which is less than the required 200 ms and provides excellent call quality. Using the G.723 codec provides high quality, since the delay of 239 ms and 400 ms less.
Thus, the network can provide the required service level.
Conclusion
This paper presents a new generation telecommunications network designed for the conditions of Shymkent (Kazakhstan).
The implementation of this network will provide its subscribers base TriplePlay broadband telecommunications services and
will provide the following benefits:
- Allows you to transmit on the same network information of any kind: voice, data, video, with a guarantee of quality - support QoS.
- Will enable the provision of services of any kind without a fundamental restructuring of the existing network.
- For the residents of modern high-speed services (VoIP, VPN, VOD, Internet, etc.), the ability to work with any IP applications on the Internet.
References
- Description of the main solutions Cisco. / Internet resource. - Mode of access: www/ URL: http://syssoft-group.ru/pages/magistral/
- The use of Ethernet technology to build a multi-service networks. / Internet resource. - Mode of access: http://www.c-tt.com.ua/content/print.asp?sn=291&ver=full
- Products from Cisco. / Internet resource. - Mode of access: www/ URL: http://www.ske-service.ru/brand.php?bid=57
- Varieties of Ethernet. / Internet resource. - Mode of access: www/ URL: http://data-transfer.ru/archives/26raznovidnosti-ethernet/
- Data transmission technology and VoIP. / Internet resource. - Mode of access: www/ URL: http://www.konturm.ru/tech.php?id=tech