Corporate satellite network. Satellite communications: operating principle, coverage area, channel characteristics and tariff plans. Tariffs for building corporate communication networks

Sunduchkov K. S., Kogut A. L., Sunegin D. G., Sushko S. I. Educational and Scientific Institute of Telecommunication Systems at NTUU "KPP" Industrial Lane. 2, Kiev, 03056, Ukraine

Abstract The work sets out the formulation of the problem of optimizing the architecture and parameters of a corporate satellite information transmission network.

I. Introduction

For small corporate satellite information transmission networks, the cost of equipment and operating costs become fundamental. The objective function of network optimization is to minimize these costs. The area for changing parameters is a field of various protocols for generating a digital stream and network management.

II. Main part

Existing corporate information transmission networks can be classified as Terrestrial networks, satellite networks, hybrid networks using both satellite and terrestrial channels. In addition, corporate networks differ in terms of coverage area, the number of subscribers served, the intensity and nature of traffic, the cost of equipment, the cost of operating expenses, etc.

To clarify the subject of this work, we will consider a small corporate network to be a satellite network serving subscribers in Ukraine, numbering up to 15-20 subscribers, providing a limited range of services (telephone, fax, data transfer) and having a total traffic of up to 100 MB/day. The parameter of such a network is the “Corporate Satellite Network for Operational Monitoring of Wind Power Plants” (CSOM WPP).

Composition of KSSOM

KSSOM consists of subscriber transceiver stations (USTS) and a central transceiver station (CPTS) at the receiving center in

KSSOM is built on a modular principle. One module provides for servicing 6 departments, two modules 12, etc. Expansion to 24, 48, 96, etc. is provided.

The APPS consists of a mini-VSAT transceiver terminal and a subscriber terminal (AT).

The central station consists of a mini-VSAT, a central terminal (CT) with a network management system and related software.

AT and DT personal computer with a modulator and demodulator, an installed program to ensure the information exchange technology used.

Terminal composition:

For transmission, modulator, interface, buffering, scrambling, noise-resistant coding, modulation and pre-filtering circuits, reference oscillator;

For reception, demodulator, interface, main selection path, Viterbi decoder, descrambler, buffer, reference oscillator;

At the customer's request, KSSOM is equipped with cryptographic protection equipment.

Expected technical and economic parameters of KSSOM

APPS and DSPS receivers must ensure reception of a signal with a bit error probability of no more than 3-10′ 6 for at least 99.53% of the worst month.

Full service life of at least 10 years.

Shelf life 12 years.

The cost of operating expenses for one branch, the cost of supplying equipment for one set as well as the number of subscribers in the network, traffic and information speeds of channels are the subject of the contract.

Warranty service 1 year, post-warranty service under a separate agreement. The solution to the problem of reducing operating costs and, first of all, the cost of renting a satellite resource, the cost of renting a HUB station, seems to us in the following directions: minimizing the operating frequency band of the leased satellite resource; refusal to lease traditional HUB stations in favor of developing a specialized network management program; renting out unused corporate network resources to other corporations.

To implement the above, the problems of optimizing the digital stream generation software and creating a specialized network management system are solved. The field on which the optimal protocols are searched consists of: “Protocol X.25” (CCITTRecomendatio X.25), FR with the addition of LMI, IP (Internet Protocol), etc.

Preliminary calculations show that the total operating frequency band leased on the satellite can be 64 kHz (duplex channel 2x32 kHz). At the same time, the operating costs for renting a satellite resource at a cost of $4000 per 1 MHz per month is $256 per month. If the cost of this rental is divided by 20 subscribers, then the cost of the resource on the satellite for one subscriber will be = $128 per month.

III. Conclusion

A two-level architecture of a satellite information transmission network is proposed, in which all subscribers have access to SCPS network resources upon request. FR digital stream generation protocol. Bandwidth (frequency resource on the transponder) 64 kHz. The transmission frequency is up around 14 GHz, down 12 GHz. The network has up to 20 directions, connected via satellite to the Information Processing Center in Kiev.

The network option we offer is based on domestically produced terminals. This provides the following advantages: lower supply costs of terminals, cheaper terms of contracts for warranty and post-warranty service. In addition, this solution provides additional jobs for domestic producers.

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2. Sunduchkov K. S., Steklov V. K. Control in satellite communication networks built according to the “everyone with everyone” scheme. Textbook K.: SE UNIIS, 2001, 33 p.

3. Sunduchkov K. S., Steklov V. K. Structure of the frequency-time plan of the decentralized satellite communication network “SNT VX-VSAT”. Study guide K.:

SE UNIIS, 2001 -36 p.

4. Makarov A. A., Sunduchkov K. S. “System for operational monitoring of wind farms.” Reports of the III International Conference “Unconventional Energy in the 21st Century” National Academy of Sciences of Ukraine, Institute of Technical Thermophysics, Crimea, Sudak, September 9-15, pp. 119-121.

SMALL CORPORATE SATELLITE NETWORK FOR DATA TRANSMISSION

Sunduchkov K. S., Kogut A. L, Sunegin D. G., Sushko S. I.

Research Institute of Telecommunications, National Technical University of Ukraine ‘Kyiv Polytechnical Institute’

2 Industrialnyy Provulok, Kyiv, Ukraine, 03056

Abstract The architecture and parameter optimization of a corporate satellite data transmission network are analyzed in the present paper.

Hardware costs and operational expenses are critical for small corporate satellite data transmission networks. The primary objective for optimization is the minimization of these costs. The parameter variation range includes various digital streaming and network management protocols.

The existing corporate data transmission networks could be divided into terrestrial networks, satellite networks and hybrid networks that use satellite and terrestrial links. In addition, corporate networks differ in territory coverage, number of subscribers, traffic intensity, hardware costs, etc.

Let us assume that a small network is a satellite-based network servicing subscribers located in the territory of Ukraine, with the number of subscribers below 15-20 and offering a limited number of services (phone, fax, data transmission). The daily traffic for a small corporate satellite network should not exceed 100Mb. An example of such network could be found in

As “Corporate satellite network of real-time wind power station monitoring” (CSNRWPSM).

The CSNRWPSM includes subscriber receiver and transmitter stations (SRTS) and a central receiver and transmitter station (CRTS) located at a receiver station in Kiev, Ukraine.

The CSNRWPSM is set up using the modular approach. A single module serves 6 sections, two modules 12, etc. 24, 48, 96, etc., sections could be built up in this way.

The SRTS comprises a transceiver terminal of a mini-VSAT type and a subscriber terminal.

The CRTS consists of a mini-VSAT, a central terminal with a network management system and appropriate software.

The subscriber and central terminals are PCs equipped with modulators and demodulators and supported by software to provide the operation of a chosen data exchange technology.

The transmitter portion of the terminal includes modulator; interface; buffering, scrambling, antinoise coding, modulation and pre-filtering circuits; reference oscillator.

The receiver portion of the terminal includes demodulator; interface; main gating path; Viterbi decoder; descrambler; buffer; reference oscillator.

On subscriber’s request an encryption protection circuit may be installed with the CSNRWPSM.

The expected CSNRWPSM parameters are as follows:

The SRTS and CRTS receivers should provide for a

signal reception with a BER below 3-1 O’ 6 for at least 99.53% ofthe worst month.

Total service life exceeding 10 years.

Storage time 12 years.

Operational expenses per one section, costs of a single unit of equipment, number of subscribers per network, traffic and data link rates are subject to agreement.

Warranty service is provided for one year, subsequent servicing is subject to agreement. Cutting operational costs may be achieved along the following lines: minimization of the rented satellite channel bandwidth, using in-house network management software instead of traditional HUB-station lease, leasing unused frequency resources.

Preliminary estimates show that the overall rented satellite bandwidth could be 64kHz (2*32kHz duplex channel). Wth the leasing fees at $4000 a month per 1MHz, the costs of renting satellite resources would be $256 a month. Divided between 20 subscribers, the costs for each subscriber would be $12.8 a month.

A two-level architecture of the corporate satellite data transmission network is presented. All subscribers are granted an on-demand access to the network resources. The digital streaming protocol is Frame Relay. The bandwidth (transponder frequency resource) is 64kHz. The uplink frequency is in the 14GHz range, downlink about 12GHz. The network comprises up to 20 directions connected via the satellite with the Data Processing Center in Kyiv, Ukraine.

The proposed network utilizes terminals manufactured in Ukraine. This offers the benefits of purchasing terminals at lower costs, as well as cheaper warranty and post-warranty servicing. It also creates additional jobs for the home economy.

A corporate network makes it possible to unite geographically remote divisions of large companies with an extensive structure anywhere in Russia. DOZOR-TELEPORT CJSC provides high-quality communications at high speeds, the cost of which is not affected by the distance between the connected points.

CJSC "DOZOR-TELEPORT" within the corporate network offers the following services: data and voice traffic transmission, video conferencing and video surveillance, high-speed Internet access and much more.

Corporate networks are:

Development of comprehensive solutions and provision of the entire cycle of work performed to create a corporate network

Easy integration into existing terrestrial telecommunications infrastructure of the subscriber’s corporate network

The “Star” topology is the most common communication organization scheme today, this topology requires the least amount of costs on the part of the subscriber, makes it possible to provide data transmission at speeds of up to 4 Mbit/s between VSAT terminals with landing at the Central Communications Center of DOZOR-TELEPORT CJSC . This topology is best suited for subscribers with low traffic and non-latency-critical applications. Since data transmission is carried out in two satellite hops, the average delay increases slightly, but as already mentioned, this does not affect the quality of telephone communication.

The “Mesh” or fully connected topology is especially convenient for equivalent enterprise objects that do not have a pronounced centralization from an IT point of view, and the organization of a terrestrial channel is impossible or too expensive. This topology allows traffic to be transmitted between two terminals, including those installed in the subscriber’s central office, as well as terminals at remote sites, in one satellite hop. The stations are controlled from the Central Communications Unit (CCC) of DOZOR-TELEPORT CJSC using a central control channel.

Terrestrial communication channels for corporate networks

The use of corporate networks provides the widest possible range of services for clients of DOZOR-TELEPORT CJSC.

Traffic (data, voice and video traffic) of subscriber VSAT stations included in the corporate network of the client of DOZOR-TELEPORT CJSC is sent via satellite channels to the Central Control Station, then transmitted via a terrestrial communication channel to the customer’s office.

The terrestrial channel between the control center of ZAO DOZOR-TELEPORT and the Customer’s office in any city in Russia allows:

Ensure the interaction of remote objects with the central office without installing satellite communication equipment in the central office

Use a “star” topology with a diameter of antenna posts of 1.2 m or 1.8 m while maintaining a satellite signal propagation delay of 600 milliseconds (one satellite hop)

Support the numbering system and extend the address space of the central office to remote sites.

complete independence from ground infrastructure and short deadlines for deploying a satellite network;

• a high level of security and information protection, which are technologically integrated into the HughesNet satellite access platform used, have several lines of protection and are organized at all stages of data and voice traffic within the network;
• easy integration into the already created terrestrial telecommunications infrastructure of the Customer’s corporate satellite network;
• multifunctionality of the equipment used;
• the ability to increase the overall capacity of the corporate network and the possibility of its dynamic redistribution between individual nodes or directions;
• the ability to remotely manage a corporate network directly from the Customer’s office;
• a wide range of services and client applications;
• One-Stop Shopping - the presence of only one operator responsible for the entire cycle of work on the creation and operation of a satellite corporate network;
• providing comprehensive turnkey solutions;
• the ability to minimize capital investments and operating costs.

Currently, the need of large enterprises to create extensive corporate satellite networks that connect central offices with branches in the regions of the country is becoming increasingly urgent. Today, not only stable data transmission is required, but also high-quality telephone communications, video conferencing services, and Internet access. The vast geography of our country and the lack of terrestrial communications in many of its regions lead to the only possible choice for solving these problems - the use of satellite communications.

We offer services for organizing corporate satellite communication networks based on VSAT technologies to companies with remote branches, and the cost of the solution does not depend on the distance between branches!

Corporate networks without the use of terrestrial communication channels

At all points of the customer’s corporate satellite network, small-sized satellite terminals (VSAT) are installed, which provide data transmission at a speed of 819...4000 kbit/s between terminals with relaying through the AltegroSky control center.

Corporate networks using terrestrial communication channels

These networks are focused on providing the fullest possible range of broadband services to corporate customers. All traffic from remote points of the customer’s corporate network, where small-sized satellite terminals are installed, is transmitted via satellite channels to the AltegroSky control center and then sent via a digital terrestrial channel to the customer’s central office. Using a router, data goes to the local network server, and voice traffic goes to the office PBX.

Tariffs for building corporate communication networks

The cost of projects for organizing satellite corporate communication networks is calculated individually for each customer according to specific tasks and individual requirements.