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USER’S MANUAL. PROLINK-4/4C Premium
It appears, in case the provider emits it, a line with dynamic information (DLS) in
the lower part of the screen.
Equally, the user will be able to select the component of audio to decode, directly
identifying it by its name, by means of the rotary selector [4] turning.
4.9.2 DVB Channels Identifier: DCI5 function
This function permits to identify DVB channels. It provides information of channel
on which the BER measurement is made, as well as access to each one of the services
contained in the resultant Multiplex of channel demodulation.
Data packets can be grouped to constitute TABLES, some of these tables content
information defined by the network operator and which show the type of service that is
being supplied to the users. Among the different data defined in these tables, the most
frequently used data for channel identification purposes are:
Network:
It contents the name given to the set of all the Transport Stream
managed jointly inside of a network formed by several physical
communication channels. In case of satellite television, also contains
the satellite orbital position pointed by the parabolic dish. This
information is extracted from NIT (Network Information Table).
Service:
It contents the names of video, audio or data services present in the
Transport Stream. This information is extracted from SDT (Service
Description Table).
Bouquet: It contents the name given to the set of all the services
commercialized as one entity. The information, that in this case DVB
defines as optional, is extracted from BAT (Bouquet Association
Table) or from SDT.
Provider: It contents the provider name, which offer certain services. Within a
Multiplex one, each one of services can have its own provider, but
normally all services have a same provider. This information is
extracted analyzing the SDT.
In case the operator includes this information, the three fields are not transmitted
at the same time but they appear alternatively in different packets. Besides, the
cadence of presentation of each one of these packets may vary from one operator to
another.
5
DCI, Device and Procedure patented by PROMAX ELECTRONICA, S.A. (Patent 9901632)
10/2004
Page 61
English
The DVB group recommends to digital TV service operators the transmission on
the Transport Stream of some particular tables containing data information. The
Transport Stream is a sequence of packets, of constant length, which carry video,
audio, and data information.