products

S-Gate - Enterprise Digital Television

S-Gate is a solid state DVB-S to IP gateway. Each S-Gate blade takes an RF DVB-S or DVB-S2 feed, extracts and filters the MPEG-2 Transport Stream packets and retransmits them to multiple multicast or unicast UDP targets via an Ethernet interface. Using a single S-Gate blade, a number of Digital Satellite TV and Radio services can be transferred to standard Ethernet networks.


The S-Gate range includes a 3U Sub rack with integrated PSU for 9 gateway cards and a Desktop case and external PSU for one T-Gate module.

Digital TV channels are broadcast from terrestrial or satellite transmitters as multiplexed MPEG-2 transport streams, formatted according to the DVB standard. Each T-Gate blade acts as a gateway S-Gate is a single card solution which acts as a gateway between a broadcast DVB multiplex and UDP/IP network streams. Each blade is capable of transporting an entire DVB multiplex onto the Ethernet
network. This represents a data rate of about 40Mbit/s for DVB-S.

Anticipating that users will usually want to stream individual channels from the DVB Multiplex to separate destinations on the network, Cambridge Imaging Systems have designed S-Gate to allow for up to 11 UDP streams from a single card.

S-Gate Network diagram

Each stream from S-Gate is a standards compliant MPEG-2 Transport Stream, complete with PAT and PMT packets that correctly describe the contents, allowing playback on a wide variety of decoders.

S-Gate constantly monitors the DVB System Information contained within the tuned multiplex. This information is used to maintain an upto-date channel list, enabling channels to be started and stopped using only the logical channel number. On selecting a channel to stream, all the associated content can be transferred to the network. This includes, but is not limited to, audio, video, sub-titles, system information, MHEG, etc.

S-Gate is a single card solution which acts as a gateway between a broadcast DVB multiplex and UDP/IP network streams.

Each blade is capable of transporting an entire DVB multiplex onto the Ethernet network. This represents a data rate of about 40Mbit/s for DVB-S.

Anticipating that users will usually want to stream individual channels from the DVB Multiplex to separate destinations on the network, Cambridge Imaging Systems have designed S-Gate to allow for up to 11 UDP streams from a single card.

Each stream from S-Gate is a standards compliant MPEG-2 Transport Stream, complete with PAT and PMT packets that correctly describe the contents, allowing playback on a wide variety of decoders.

S-Gate constantly monitors the DVB System Information contained within the tuned multiplex. This information is used to maintain an upto- date channel list, enabling channels to be started and stopped using only the logical channel number. On selecting a channel to stream, all the associated content can be transferred to the network. This includes, but is not limited to, audio, video, sub-titles, system information, MHEG, etc.

S-Gate is configured and controlled using a web browser based interface.

Specification

Networking
100Base-T full duplex Ethernet interface

RF front end information
Input/loop through: F-Type Female
DISEQC output
Frequency Bands: 950MHz to 2150MHz
Multistandard demodulation:
DVB-S: QPSK 45Msps
DVB-S2: QPSK 36Msps
Error Correction: Reed Solomon and Viterbi

Configuration
Interface provided by RS232, USB, Telnet, HTTP and Automation Interface

Dimensions
210x100mm (blade only)

Stream targets
Up to 11 unicast or multicast UDP streams. Each stream can filter up to 32 PIDs from the multiplex. This means that approximately 5 complete TV services from the original DVB transport stream can be streamed to a single UDP target. In most cases, a single TV service or up to 16 radio services are streamed to each target. For specialised use, the complete DVB multiplex transport stream can be streamed to a target.

Management streams
Status and EPG information (where available) is optionally streamed to a separate UDP