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Date:  October 26, 1998
From:  Wolfram.Titze@FR.BOSCH.DE
Subject:  ETI/STI protocol

A while ago, nicolas.croiset asked about the differences between
ETI-NI, ETI-NA, STI-NI and STI-NA:

ETI (Ensemble Transport Interface) and STI (Service Transport
Interface) are interface protocols for EUREKA 147 DAB and belong to
the family of collection and distribution protocols used in the
EU 147-DAB transmission network.

The ETI is used between the Ensemble Multiplexer and the different
transmitters of the single frequency network. It is unidirectional at
a rate of 2,048 Mbit/s.

The STI is used between the service providers and the Ensemble
Multiplexer, i.e. it helps to collect the different contributions to
the multiplex. It consists of a unidirectional data part and a
bidirectional conrol part. In simple terms, the data part contains the
data to be transmitted, the control part the control information
needed assemble the multiplex and to organise multiplex
regonfigurations. The data rate depends on the STI variant
implemented.

Both ETI and STI exist as NI (Network Independent) and NA (Network
Adapted) versions. NI means, no additional error correction is applied
to the data stream, i.e. it is used for short, stable, reliable links.
NA means, that additional error detection and correction is applied
(Reed Solomon Codes) and errors that occur during the data
transmissions can be detected and corrected.

Hope this helps, best regards,

Wolfram Titze
--
Dr. Wolfram Titze
Robert Bosch Multimedia-Systeme GmbH & Co KG
Dpt.: MU/EMS3
Robert-Bosch-Strasse 200, D-31139 Hildesheim

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