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-Network Topology -Remote Gateway
-Meg@ctive Hub -Network Management System (NMS)

System Overview

The Meg@ctive system is a Two-Way Multimedia Interactive System over satellite, that provides a cost-effective, reliable and immediate deployable solution for servicing broadband applications such as Internet Access, Distance Learning, Teleconferencing, Direct Video Broadcasting (DVB-S) and more. This is achieved by incorporating satellites to divert the transmission to/from different destinations, over large territories, bypassing the bottlenecks of the terrestrial infrastructure.

Meg@ctive system offers multiple users to enjoy multimedia applications at unprecedented speeds, by incorporating forward link DVB-S/MPEG-2 technology, a full 36 MHz transponder can allow 30Mbps of outbound data rate transmission, achieving an Inbound data rate of TCP/IP protocol of 1.6Mbps per session. The return path from the Remote Gateway to the central Hub, also via satellite, offers data rates of up to 384Kbps. Using the DVB-S technology for the forward link enhances the efficiency of the space segment usage due to the natural feature of broadcasting information to multiple users. Also, it is very efficient in the way in which it monitors and controls the remote sites as they receive the DVB-S channel continuously. The DVB-S forward channel is dynamically time-shared between the users according to their actual needs, thus providing an optimal usage of resources. The following table summarizes the Meg@ctive system characteristics.

Network Topology tarshim1.gif (13591 bytes)

The Network operates in star topology.
The Meg@ctive consists of a Meg@ctive Central Hub and Meg@ctive Remote Gateways located at the customer sites.
The Meg@ctive Hub includes the network management software and hardware, broadcasting and receiving via satellite capabilities, and Internet Service providing software and hardware.
The Remote Gateway includes all the software and hardware to support full Internet Protocol (IP) based connectivity via satellite using customer standard equipment and Meg@ctive communication schemes.

The Remote Gateway receives the signal from the Meg@ctive Hub using the DVB-S forward channel and transmits to the Hub using SCPC Traffic Channels as assigned by the Network Management System (NMS).

Remote Gateway

The Remote Gateway is composed of indoor and outdoor units. The indoor unit is an Industrial PC based unit, including a DVB-S receiver with LAN processor, a SR256 L-band modulator and the supporting units like power supply and 10MHz reference for the outdoor unit, Ethernet LAN with 10/100BaseT interface. It can receive data rates of up to 53 Mbps (data rate per TCP/IP session of up to 1.6Mbps) and transmits data rates of up to 384 Kbps. The outdoor unit consists of a Block up-converter, a standard TVRO down-converter and an optional antenna.

Meg@ctive Remote Gateway provides a complete solution to provide Internet/Intranet applications based on standard DVB-S/MPEG-2 protocol. The terminal supports high-speed data communications for fast, secure and reliable TCP&UDP over IP applications. Residing on an Ethernet network, the terminal offers multiple users to enjoy multimedia applications at unprecedented speeds, increasing work productivity and enhancing remote communication. On reception, the user terminal performs DVB-S demodulation, FEC decoding, PID de-multiplexing and filtering. The Meg@ctive Remote Gateway reconstructs IP datagrams from DVB-S/TS cells and routes them to the appropriate PCs on the shared LAN. On transmission, the terminal collects IP datagrams from all the PCs and processes and transmits via the outdoor unit to the Hub.

The modulator at the Remote Gateway uses advanced Digital Signal Processing (DSP) technology and advanced algorithms, housed on a small compact digital board. The unique L-band interface (950-1535 MHz) reduces RT’s cost and allows the achievment of an exceptional price-performance ratio.

Meg@ctive Hub

The indoor portion of a Hub with minimal configuration is composed of a DVB-S broadcast server, DVB-S modulator, bank of receivers, two NMS servers, and a router with WAN interface toward the Internet backbone. The equipment is connected via a 100BaseT Ethernet LAN. The DVB-S modulator supports transmission rates of up to 53 Mbps. Each receiver of an inbound channel supports data rates of up to 384Kbps.

Network Management System (NMS)

The Network Management and Control System are responsible
for the following:

* Bandwidth allocation.
* Power control.
* Transmission control.
* Conditional access.
* Channel and user monitoring.

The system dynamically assigns bandwidth to the subscribers according to their needs. The space segment resources are exploited efficiently and the subscribers cost is reduced accordingly. Indications on the received power at the hub are transmitted via the outbound channel to the subscribers for adjusting their transmitted power level. Transmission from the remote is conditioned on receiving the outbound signal at the remote and on subscriber’s authorization. The system manages the subscribers’ database which includes the remote site parameters (i.e. antenna size power amplifier modem data rates. etc.) and the access rights of the subscribers.