RU73574U1 - MULTI-SERVICE NETWORK NODE - Google Patents

Abstract

The proposed utility model relates to telecommunication technologies, on the basis of which it is proposed to implement effective convergent solutions for a phased transition from existing channel switching systems to multiservice, multimedia packet switching systems. On the basis of the proposed multiservice network node (ISU), the construction of new modern multiservice networks can be carried out, stage-by-stage modernization of existing networks, which consists in organizing fragments of the multiservice network and, ultimately, the creation of entirely next-generation networks (NGN) with appropriate protection for previous and current investments. On the basis of the equipment, it is possible to organize any network topology options.

MSU equipment, through the use of the latest packet switching technologies, is capable of transmitting various types of information within a single homogeneous equipment: speech, data, video, texts, images, implementing new types of modern and promising information and communication services. The internal switching structure of the ISU (10 Mbit / s - 100 Mbit / s - 1000 Mbit / s) allows you to create, send and receive broadband messages generated by any type of modern terminal equipment. MSU is adapted to existing digital and analog, high and low speed transmission systems, which provides easy integration into existing urban, rural and corporate telecommunication networks with the aim of modernizing them and providing subscribers at all levels of the network hierarchy with a full range of modern services.

Description

The proposed utility model relates to telecommunication technologies, on the basis of which it is proposed to implement effective convergent solutions for a phased transition from existing channel switching systems to multiservice, multimedia packet switching systems.

As a prototype, the well-known ATC-90 digital switching system, based on the traditional principles of channel switching, was chosen. It is described in a number of publications, in particular in the book: Switching Systems. Goldstein B.S. SPb: BHV- St. Petersburg, 2003. The prototype contains a switching device and an adapter for subscriber equipment, an adapter for network equipment, as well as a register block, a linear signaling block, a channel signaling block, a statistical data collection unit, and a technical operation computer.

The choice of this type of switching system as a prototype is due to the fact that to date, digital telephone exchanges are equipment on the basis of which modernization and development of telephone networks in the Russian Federation are carried out.

ATSC-90 has the ability to connect ISDN terminals and provide related services. Besides, in addition to the basic call, the subscribers of ATSC-90 can get access to the following additional types of service (VAS):

- abbreviated dialing of subscriber numbers;

- direct connection;

- call forwarding;

- conference call of three subscribers;

- notification of a new call;

- restriction of various incoming communication types;

- a temporary ban on outgoing long-distance and international calls.

A significant drawback that reduces the effectiveness of investments from the introduction of digital telephone exchanges (ATSC) is that in the presence of digital exchanges with circuit switching it is almost impossible without a radical reconstruction, and

therefore, without significant capital expenditures, implement a wide range of new modern services based on the transmission of multimedia information (speech, data, video, images, audio), as well as use new intelligent subscriber devices that provide the required services directly to the user.

The purpose of this utility model is to create such switching equipment that would allow introducing a wide range of new modern services for subscribers of existing communication networks, as well as connecting various types of subscriber equipment that provide such services.

To achieve this goal, it is proposed to use switching equipment based on packet switching technology.

A multiservice network node (MCU) is proposed, including a switching device and an adapter for subscriber equipment, as follows:

- a switching device in the form of an Ethernet switch that has access to the IP network,

- additionally introduce a group of transport media gateways, which on the one hand should be connected to the adapter of subscriber equipment, and on the other hand with a signaling gateway, Proxy server, DNS server, management server, service server and Ethernet switch via Ethernet.

This design of a multiservice node allows you to work on IP networks.

In order to enable the node to work together over IP networks and public communication networks (SSOP), it is proposed to additionally introduce a second group of transport media gateways, which on the one hand should be connected to the network adapter and have access through it to the public communications network use (SSOP), and on the other hand is connected to an additional signaling gateway and to the rest of the equipment node through an Ethernet network.

An additional difference of the proposed multiservice network node is that the number of transport media gateways in each group can be from one to four.

Multiservice network node - represents a new generation of communication tools, built on the basis of modern infocommunication technologies, and combining all the available functionality of digital telephone exchanges with circuit switching with functionality, and, above all, with services inherent in new generation telecommunication equipment.

On the basis of local self-government, construction of new modern multiservice networks can be carried out, a phased modernization of existing networks consisting of organizing fragments of a multiservice network and, ultimately, the creation of entirely next-generation networks (NGN) with appropriate protection of previous and current investments. On the basis of the equipment, it is possible to organize any network topology options.

MSU equipment, through the use of the latest packet switching technologies, is capable of transmitting various types of information within a single homogeneous equipment: speech, data, video, texts, images, implementing new types of modern and promising information and communication services. The internal switching structure of the ISU (10 Mbit / s - 100 Mbit / s - 1000 Mbit / s) allows you to create, send and receive broadband messages generated by any type of modern terminal equipment.

MSU is adapted to existing digital and analog, high and low speed transmission systems, which provides easy integration into existing urban, rural and corporate telecommunication networks with the aim of modernizing them and providing subscribers at all levels of the network hierarchy with a full range of modern services.

ISU provides work on:

- digital transmission systems;

- fiber optic communication lines (FOCL);

- Wireless narrow and broadband communication systems.

LSGs are equally suitable for use on public communication networks (SSOP), and in corporate networks. At the same time, it is easily integrated into the SSOP and IP-networks, in particular, the Internet and / or Intranet.

In a public telephone network, MSU can be used as a means of communication, performing the functions of switching systems using the technology of switching information packets, as part of a transit, terminal-transit and terminal local communication node using signaling OKS No. 7, 2BCK, R1.5, R2 and compliance with SORM requirements.

For departmental networks, the ISU can be used as an institutional-production automatic telephone exchange (UPATS) that performs the functions of systems

switching using information packet switching technology. At the same time, alarm systems of ACS No. 7, 2BCK and EDSS1 are used.

MSU allows for interaction with all types of telephone exchanges existing on the network, as well as with departmental and commercial networks based on interfaces adopted on the public telephone network and approved by international organizations.

ISU provides the ability to carry subscriber capacity. The total remote capacity can be up to 100% of the capacity without restrictions on the number of offsets. The communication between the offsets and the ISU can be carried out via PCM path channels and trunk lines using xDSL and IP technologies, as well as wireless communication lines. The number of external directions from LSG and the maximum number of lines in each direction is determined by the initial data for the project.

For signaling purposes in the IP network, the ISU equipment uses SIP (Session Initiation Protocol, RFC 3261), which allows not only notifying users of an upcoming connection, but also determining the characteristics of the transmitted information stream.

In addition, the SIP-T protocol is used to transmit the signaling messages of the ISUP subsystem ISS OKS No. 7 over the IP network, which encapsulates the ISUP signaling information in the IP protocol stack. For the transmission of voice messages over a data transmission network based on IP technologies, the RTP and RTCP protocols are used. Media gateways are controlled by signal gateway controllers using the H.248 protocol.

Figure 1 shows one example of building a multiservice network node, where:

1 - subscriber equipment adapter;

2 - signaling gateway;

3 - transport media gateway;

4 - Ethernet switch;

5 - network adapter;

6 - Proxy server;

7 - DNS server;

8 - registration server;

9 - management server;

10 - service server.

Figure 2 shows one example of the construction of a communication node with the possibility of increasing the numbering capacity.

The basic structure of the ISU is built using Softswith technology. The ISU equipment complex consists of functional modules combined into the following groups:

- user terminals;

- media, signaling and other gateways;

- servers;

- Ethernet switches.

The group of user terminals includes various types of subscriber equipment corresponding to a certain type of service:

analog telephones (TAs), personal computers and laptops IP telephones supporting SIP protocol, Soft-Phone (PC-based), ISDN terminals.

The gateway group consists of the following functional components:

- subscriber equipment adapter - 1;

- signaling gateway - 2;

- transport media gateway - 3;

- network adapter - 5.

The purpose of these components is as follows:

- The network adapter 5 is designed to provide interaction with any linear equipment installed on the network (analog or digital).

- Adapter 1 of subscriber equipment is designed to provide interaction with subscriber equipment.

- The signaling gateway 2 performs the following functions:

- provides support for the exchange of signal messages of the switching nodes of the SSOP channels with packet switching devices implemented on the basis of the SIP (Session Initition Protocol);

- performs statistical multiplexing of user information and output to the network with routing IP packets, as well as inverse transformation and demultiplexing;

converts the signaling messages of the alarm systems SSOP OKS№7, E-DSS1 and others into signaling messages SIP, and also performs the inverse transformations.

In the alarm gateway 2, a temporary storage of statistical data is located, which after a specified period of time is transmitted to the management server. Gateway management can be done remotely via Telnet / SSH or SNMP. This allows you to use any management system that supports the open SNMP packet network management standard.

- Transport Media Gateway 3 provides:

- conversion (forward and reverse) and packaging of voice information in RTP / UDP / IP packets;

- Converting speech information into packets and backward conversion by encoding / decoding voice information in accordance with ITU-T Recommendations G.711A-Law and G.711mU-Law, G.729A;

- echo cancellation and echo cancellation in accordance with the requirements of G.168, with delays in the echo path up to 128 m / s;

- recognition and processing of DTMF signals, generation of acoustic (tonal) information signals;

- support for modem connections and facsimile sessions.

All types of transformations that are performed in the transport media gateway are implemented on the basis of specialized digital signal processing processors - Digital Signal Processors (DSP) from Texas Instruments, series: TMS320C67XX, TMS320C64XXT-1.

In the ISU for the organization of in-house communication uses a reliable packet-switched switched network of industrial class. A feature of this class of network is its high reliability due to structural and functional duplication, as well as quick network recovery when changing its configuration or the failure of any element. Thus, when

malfunctions in an in-house dial-up Ethernet network there will be no loss of calls, both served and incoming.

ISU server equipment includes:

- Proxy server 6, providing call routing, user location, user authentication and authorization;

- DNS server 7 performs the conversion of the decimal telephone number of the MSCS (in the format defined by Recommendation E.164) into an IP address;

- the registration server 8 provides registration of the equipment of the connected user;

- the management server 9 supports the management interfaces and provides the collection, processing and recording of emergency and statistical information for monitoring and control. It contains a database of configuration data, which contains information related to the operation of the system - from configuration files to types of subscriber services;

- the server 10 services is responsible for providing a wide range of services to the user.

The main advantages of the proposed LSG:

Modularity of construction

The modular principle allows the formation of the composition of network elements of the required capacity and performance necessary for the implementation of system projects. Due to the modularity of construction and unification of the used hardware and software, the equipment of the local self-government provides the ability to organize a flexible and scalable solution to a wide range of tasks.

Adaptability

MSU easily integrates into existing networks and does not require the installation of additional converters. This degree of adaptation to the existing network infrastructure allows you to organize a smooth phased modernization of the network, which is the most cost-effective way to develop existing networks.

Ability to connect various subscriber devices

As the subscriber terminal devices, traditional analog telephones, modems, faxes, ISDN terminals, as well as packet-switched network terminals, including IP phones, computers (laptops) and softphones, IP phones, can be connected to the ISU camcorders and a variety of digital sensors, devices and sensors. The ISU equipment provides for the possibility of connecting subscriber devices of both wired and wireless broadband access.

A wide range of modern services provided

MSU has wide functional capabilities both for the provision of ATSC services and for the implementation of an expanded range of fundamentally new services that are in demand in modern business models, for example, such as:

- audio-video-conferences;

- implementation of the Triple play service;

- “intelligent building” - a comprehensive solution for the integration into the new housing complexes and industrial buildings of advanced telecommunication systems, management of life support functions and building safety;

- IP video surveillance;

- telemedicine;

- Remote education.

The structure of LSG services also includes:

- Transmission of multimedia messages;

- Auto redial;

- Call forwarding management;

- Ban on incoming and outgoing calls;

- Voice greetings and tips;

- Call hold;

- call transfer;

- View missed calls;

- Creation of user groups;

- Voice mail;

- Restriction of incoming or outgoing communication;

- Secretary of the director;

- Interactive voice menu-IVR;

- Digital Secretary;

- Call parking;

- Automatic notification;

- Recording telephone conversations;

- "Follow me";

- "Do not disturb";

- Alarm clock;

- Exact time;

- audio conference;

- conference call;

- Two-way and multi-way video conferencing;

- Autoinformer.

The proposed multiservice network node is manufactured and supplied by LONIIS FSUE under the SAPPHIRE trademark.

ISU is a hardware-software complex, which is built on the basis of the following components:

The adapter 1 of subscriber equipment developed by FSUE LONIIS contains a block of subscriber equipment, which consists of a group of subscriber kits and a coprocessor of subscriber signaling. The subscriber equipment unit (SUB) performs analog-to-digital conversion of the speech signal of the analog subscriber station. The load concentration is produced in SUB, as a result of which each SUB with a capacity of 256 subscribers is connected to transport media gateways via in-line PCM lines with a loop structure

2 Mbps transfer rate. Each PCM line includes 30 conversational time intervals and one time interval for signaling. The control functions carried out in the unit in real time are performed by the subscriber signaling coprocessor (SSCP). One SSCP serves 128 subscriber lines, there are two such processors in SUB with a capacity of 256 subscribers. The subscriber module consists of a subscriber signaling coprocessor (SSCP) and from 1 to 8 TEZs of subscriber sets (AK16) containing a maximum of 128 subscriber lines. Subscriber signaling coprocessor (SSCP) is designed to work with conventional subscriber sets, it is also possible to connect up to 8 payphones instead of ordinary AK. A subscriber kit AK16 provides power to the microphone circuit of an analog telephone (TA), provides a ringing signal to the TA side, and broadcasts voice signals from subscribers. The AK16 board contains individual subscriber equipment for sixteen subscribers, a control device and a PCM signal receiver.

Signal gateway 2 is implemented on an industrial computer (PC), equipped with:

- A motherboard with a Pentium IV 2.4 GHz processor and 512 MB DDR 400 RAM;

- Drive 120 GB;

- VGA video adapter.

The signaling gateway PC has the following interfaces:

- A connector for connecting an external power adapter;

- USB 2.0 ports for connecting peripherals;

- RJ-45 connector for connecting to a local Ethernet network;

- VGA connector for connecting an external monitor;

- LPT-interface for connecting a printer;

- Serial interface port type RS-232.

The signaling gateway software was developed at FSUE LONIIS.

Transport media gateway 3 was developed at LONIIS Federal State Unitary Enterprise and made in the form of a block (TEZ) according to the so-called “mezzanine principle”, i.e. on one board

called transport, relatively independent "mezzanine boards" are installed that implement the necessary functions.

The MG transport board contains a 16 * 16 PCM switching matrix, interface microcircuits, power supplies and a number of auxiliary microcircuits, as well as eleven pads for installing “mezzanine modules”. The number of "mezzanine modules" may vary depending on delivery conditions.

There are three types of such modules TMS, WIZnet, ADSP:

- The TMS module performs all the intelligent functions of the board. This module is implemented on Texas Instruments TMS320C6713 Digital Signal Processors (DSP). In addition to the processor itself, RAM, ROM and a crystal oscillator are located here. Each of the TMS modules is designed to process two E1 channels. Up to five of these modules are installed on the transport board;

- Module WIZnet IIM7010A - provides a physical output to Ethernet via TCP / IP, with support for a limited number of connections. Each such module is controlled by a separate TMS module;

- ADSP module - provides the implementation of Caller ID functions and is performed on three Analog Device processors. Each processor has its own ROM.

4 Ethernet switches are designed to provide reliable high-speed communication channels and switching of the required devices.

The choice of Ethernet switches is determined by the configuration of the ISU, i.e. number and type of devices and network interfaces. Switch ports provide connectivity by standards:

- IEEE 802.3 10BASE-T Ethernet (copper twisted pair);

- IEEE 802.3u 100BASE-TX Fast Ethernet (copper twisted pair);

- E 802.3ab 1000BASE-T Gigabit Ethernet (copper twisted pair).

All ports support IEEE 802.3x flow control. This avoids packet loss when the port buffer of the receiving device is full. The switch ports also perform auto-negotiation of speeds and auto-detection of duplex / half-duplex modes.

Network adapter 5. As the network adapter in the ISU, the block (TEZ) of the development of FSUE LONIIS - “Terminal Station Set ETM-Z” is used.

The ETM-Z TEZ contains four station sets, each per 2048 kbit / s stream, designed both for receiving a signal from the PCM path and for transmitting a signal to the PCM path, in accordance with ITU-T Recommendations G703, G.704.

The ETM-Z unit performs the functions of:

- receiving a signal from the PCM line;

- signal transmission to the PCM line;

- buffering the signal received from the PCM line to eliminate phase jitter in it.

When installing an additional ETMO-Z TEZ, reception and transmission of the E1 stream to the fiber optic communication line (FOCL) are provided.

Technological servers, which include: Proxy server 6, DNS server 7, registration server 8 and control server 9 are implemented on industrial computers with technical specifications similar to those used by signaling gateway PCs. The software of each of the servers was developed at FSUE LONIIS.

Server 10 services runs on the basis of industrial computers with higher requirements for their performance compared to other servers. The parameters of the services server PC are determined by the type of services and the composition of services, as well as the subscriber capacity. The service server software was developed at FSUE LONIIS.

Claims (3)

1. A multiservice network node, including a switching device, an adapter of subscriber equipment and a network adapter, characterized in that the switching device is made in the form of an Ethernet switch that has access to the IP network, and the node further comprises a group of media transport gateways, which on the one hand It is connected to the adapter of subscriber equipment, and on the other hand, to a signaling gateway, proxy server, DNS server, management server, service server and Ethernet switch via Ethernet. 2. The multiservice network node according to claim 1, characterized in that it further comprises a second group of media transport gateways, which, on the one hand, is connected to the network adapter and has an exit through it to the public communication network (MTS), and on the other hand is connected with an additional signaling gateway and with the rest of the node equipment via Ethernet. 3. The multiservice network node according to claim 1, characterized in that the number of transport media gateways in each group can be from one to four.