International Media Delivery Network
For delivery of linear channels as well as non-linear content to required destinations Levira has set-up a dedicated fibre-based Media Delivery Network connecting all major locations in Northern Europe and beyond. Signal delivery service includes two sub-services:
a) Encoding in agreed format and with agreed parameters.
b) Delivery to the agreed destination with hand-over to destination network and/or distribution partner.
a) Encoding Service includes processing of real-time audiovisual asynchronous feed and all related components inside it, including also multiplexing and generation of feedback reference signals for play-out for generation of DVB subtitles. Main purpose of the process is to prepare distribution-ready signal as agreed it separately per each channel, format and profile. Encoding service can be done for each service in multiple formats and profiles with parameters what are each time separately specified and agreed.
Due to synchronization differences professional content delivery and channels play-out platforms operate with Dolby-E stream, but MPEG-systems use as a rule Dolby Digital AC-3 signals to distribute surround sound to home electronics devices. To supply end-user feed with Dolby Digital AC-3 sound (also when original Dolby surround is not available) we use a solution were we use official Dolby-E decoders, AC-3 or EAC-3 encoders and HD-SDI stream processing (everything fully redundant).
Dolby-E will be decoded from incoming HD-SDI signal to PCM multichannel streams. It can be done within de-multiplexing the serial signal. Also normal stereo PCM feeds will be de-muxed. All de-muxed feeds shall be forwarded to the Dolby encoder. In case encoder does not have incoming audio streams from Dolby-E, it will generate pseudo-surround or insert it without artificial pre-processing from original stereo audio pairs to the encoded Dolby Digital AC-3 signal. After Dolby encoding the signal shall be multiplexed to serial video stream again. All devices are synchronized with common clock sources. Lip sync has to be adjusted together with DVB encoding and multiplexing set-up to secure perfect sync of Dolby audio.
All video and audio input and feedback signals via downlink feature are monitored 24/7 by monitoring engineer. Levira is recording full log of all reachable status and alarm information regarding operational systems and devices what makes possible later analyze of failures. There is also kept a database with all configuration changes in all systems and devices. It is updated automatically twice per hour to secure it’s completeness. It is very instrumental in case of major software complications.
Additionally automatic permanent ETR 290 analyzing is running for all transport streams.
b) Distribution Service includes delivery of SDI, ASI or IP streams to agreed destination point(s). For operators (or distribution partners) the signal(s) will be available through Levira´s fibre-based Media Delivery Network. Service also includes detailed real-time monitoring of all services (channel feeds) and 24/7 supervision and maintenance.
Media Delivery network is set-up using two fully independent signal routes on all directions. There are not any network nodes or other devices in use what may affect service as „a single point of failure“. In normal operation each of the signal routs pass through the different network nodes in different physical locations. All operators/networks are connected with Levira´s Medianet, also using two independent and mirrored physical interconnections. That is necessary, to avoid disturbances what may be caused by maintenance and development works. Also it provides protection against hardware failures.
Circle based 10G core network is set-up in Tallinn. This connects all major international interconnect places across Tallinn. Core network takes distribution-ready signals off via two separate and diversified equipment locations. It has three independent interconnect locations to connect us with rest of Europe. There are three separate optical sea cables between Helsinki and Tallinn and two separate cables between Tallinn and Stockholm. Those are used for connectivity with locations in Scandinavia and in rest of Europe. With other Baltic countries and Poland a power grid based diversified optical connection is used. Medianet consists of 4 main ring-structure based distribution networks. Each of them connects dedicated area and has at least two separate connection points with our core network. Dedicated distribution areas are Sweden+Finland; Norway+Denmark; Baltic’s, Germany and UK. As a standard we use doubled active network nodes and IP-routers in all of our points of presents. All main distribution networks are based on DTM technology, specially designed for real-time media delivery purposes. Main technology supplier is Netinsight AB.
Please find more details about Media Delivery Network and a high level network topology here.
Network is constantly being developed further as needs of our clients require it.