Transport Stream over IP (TSoIP) is a method of transfering video/audio streams (usually compressed with MPEG-2) over IP based networks. The encapsulation of the native Transport Stream (TSoASI) into the IP packet increases the rate of the TS as a result of the addition of headers (RTP/UDP/IP/MAC headers). This can increase the TSoIP bitrate by 4%-28% depending on the system configuration.
Novelsat has implemented within it’s products (NS1000/NS2000/NS3000/NS300X) the ability to convert the TSoIP back to native TS before transmission to the satellite and convert it back from native TS into TSoIP at the remote site, introducing significant saving to the required satellite bandwidth.
TSoIP Distribution Application
The following diagram shows a TSoIP distribution system:
The TSoIP feed, coming from an encoder or multiplexer, is connected directly to the NS1000 modulator. The modulator de-capsulate the TS packets and transmit the native TS toward the satellite. At each remote site, the NS2000 demodulator receives the native TS and either regenerate the TSoIP stream or output it over ASI.
Bidirectional TSoIP channel for DSNG Application
The following diagram shows a bidirectional TSoIP channel for DSNG application:
In modern DSNG fleet, a bidirectional communication channel is used to communicate with the truck in the field. The return link is used to transmit the on field generated audio-video signal, to the studio while the forward link can be used to transmit the actual audio-video signal that is distributed to the homes.
In bidirectional communications, modems are used at both sides of the link. In the field, the generated audio-video signal is transferred to the modem using TSoIP. The modem de-capsulate the overheads and transmits the signal as a native TS over the satellite link. At the studio side, the modem receives the native TS signal, recreates it back to TSoIP and forward to the studio network.
In parallel to the TSoIP service, a bidirectional IP channel can be used using NovelSat’s Dual Channel mode.