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The DVB family of standards contains GEO satellite communication with various options of in .NET Printing barcode standards 128 in .NET The DVB family of standards contains GEO satellite communication with various options of




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The DVB family of standards contains GEO satellite communication with various options of generate, create none none with none projects Android uplink (or none for none return) and downlink (or forward) channels. Up to a few years ago, satellites were only able to transfer data unidirectionally from the content sources to the end user equipment, mostly TV sets. However, in recent years bidirectional communication has been introduced with various return channels such as telephones, ISDN, Cable TV, DECT, and LMDS.

Here is a list of DVB standards:. ETS 300 802 , Digital Video Broadcasting (DVB); Network-independent protocols for DVB interactive services ETSI ES 200 800, Digital Video Broadcasting (DVB); DVB interaction channel for Cable TV distribution systems (CATV) TR 101 201, Technical Report Digital Video Broadcasting (DVB); Interaction channel for Satellite Master Antenna TV (SMATV) distribution systems; Guidelines for versions based on satellite and coaxial systems EN 301 193, European Standard (Telecommunications series) Digital Video Broadcasting (DVB); Interaction channel through the Digital Enhanced Cordless Telecommunications (DECT) EN 301 195, European Standard (Telecommunications series) Digital Video Broadcasting (DVB); Interaction channel through the Global System for Mobile communications (GSM) EN 301 199, European Standard (Telecommunications series) Digital Video Broadcasting (DVB); Interaction channel for Local Multi-point Distribution Systems (LMDS) ETS 300 801, Digital Video Broadcasting (DVB); Interaction channel through Public Switched Telecommunications Network (PSTN)/Integrated Services Digital Networks (ISDN) ETSI EN 301 958 V1.1.1 (2002-03) European Standard (Telecommunications series) Digital Video Broadcasting (DVB); Interaction channel for Digital Terrestrial Television (RCT) incorporating Multiple Access OFDM TR 101 194, Digital Video Broadcasting (DVB); Guidelines for implementation and usage of the specification of network-independent protocols for DVB interactive services.

In this boo none for none k we focus on the satellite DVB standards that provide two-way communication through the satellite, referred to as DVB-RCS. In these systems the end user has direct access to the satellite using the satellite"s uplink and downlink channels. We focus on the following standards and documents:.

ETSI EN 301 790, European Standard (Telecommunications series), Digital Video Broadcasting (DVB); Interaction channel for satellite distribution systems ETSI TR 101 790, European Standard (Telecommunications series), Technical Report Digital Video Broadcasting (DVB); Interaction channel for Satellite Distribution Systems; Guidelines for the use of EN 301 790 TR 101 202, European Standard (Telecommunications series), Digital Video Broadcasting (DVB); Implementation guidelines for Data Broadcasting EN 301 192, European Standard (Telecommunications series), Digital Video Broadcasting (DVB); DVB specification for data broadcasting ETS 300 802, European Standard (Telecommunications series), Digital Video Broadcasting (DVB); Network-independent protocols for DVB interactive services. The downlin none for none k related part of the specifications includes the DVB-Satellite (DVB-S) standard which is used in the typical satellite broadcast systems. For uplink communication, the DVBRCS standard uses the RCST (Return Channel Satellite Terminal), a satellite terminal that supports interactive services such as SMATV (Satellite Master Antenna Television) as well as data transmission. DVB-RCS MAC is based upon FDM/TDM, where the uplink and downlink transmissions take place at different frequency ranges.

DVB-RCS does not define a specific operating frequency. channel to be used, which allows flexible frequency deployment. Both the uplink and downlink channels are time slotted. The MAC specifications allow vendor specific implementations of various QoS supporting algorithms.

Depending on the dish size, DVB-RCS can achieve maximum data speeds as detailed in Table 13.1. The actual data speed depends on the DVB operator equipment and agreements with the end user.

. Table 13.1. DVB-RCS Maximum Data Speeds Dish Size Return Link Speed Forward Link Speed 0.6 Meter 150 kbps 38 Mbps < Day Day Up > 1.0 Meter 380 kbps 38 Mbps 1.2 Meter 2 Mbps 38 Mbps < Day Day Up > 13.2 Architecture The DVB-RCS model is shown in Figure 13.1. DVB supports two channels: the Broadcast Channel and the Interaction Channel.

. Figure 13.1. DVB-RCS System Model The Broadca st Channel, which is a unidirectional downlink broadcast channel, is identical to the channel defined in the satellite digital video broadcast (DVB-S) standard. The Interaction Channel provides bidirectional interaction communication between the service provider and the end-user. The Interaction Channel consists of a Forward Interaction channel (from the service provider to end-user) and Return Interaction channel (from the end-user to service provide).

Typically, the Forward Interaction channel is included in the Broadcast Channel. The RCST provides interface for both Broadcast and Interaction Channels. It is supported by the Network Interface Unit and the Set Top Unit.

A satellite interactive network with several RCST channels is described in Figure 13.2. The NCC (Network Control Center) monitors and controls the operation of the satellite interactive network.

The NCC manages the network resources and authorizes and allocates transmission resources to RCSTs. The system is fed by a few Feeder Stations. The Feeder Station on the forward link is a standard satellite digital video broadcast (DVB-S) on which we multiplex user data, control, and timing signals.

The Traffic Gateway receives RCST return signals and provides accounting functions, interactive services, and connections to external public or private service providers. These service providers can be Internet data services, pay-per-view TV, financial services, and corporate networks..

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