![](https://csdnimg.cn/release/download_crawler_static/13106934/bg13.jpg)
ETSI
ETSI TR 101 290 V1.4.1 (2020
Engineers seeking to apply the methods described in the present document should be familiar with the standards for the
respective baseline systems. Although most of the parameters specified in the present document are well known in
communications, most of them should be interpreted with respect to the new environment, especially the transmission
of digital TV signals or other related services.
The inclusion of each parameter in the present document is based on requirements from those who envisage having to
work alongside the defined procedures. This includes network operators and providers of equipment for network
installation, as well as manufacturers of Integrated Receiver Decoders (IRDs) or test and measurement equipment.
The recommendations of the present document can be used:
- to set-up test beds or laboratory equipment for testing hardware for digital TV and other related services;
- to set these instruments to the appropriate parameters;
- to obtain unambiguous results that can be directly compared with results from other test set-ups;
- to form a potential basis for communicating results in an efficient way by using the definitions in the present
document as references.
They are not intended to describe a set of compulsory tests.
The recommendations are grouped in several clauses. Since the MPEG-2 TS is the signal format used for the inputs and
outputs of all baseline systems, clause 5 is devoted to the description of checking procedures for those parameters which
are accessible in the TS packet header, i.e. without decoding scrambled or encrypted data. The aim of these tests is the
provision of a simple and fast health check. It is meant neither as a MPEG-2 conformance test nor as a compliance test
for all DVB related issues.
Clause 6 contains the parameters which are commonly addressed by various transmission media. For example, the
measurement of the availability of transmission systems or links falls into this category, and it may be desirable to have
the same definition for availability independent of the actual system in use.
Clauses 7 and 8 address the parameters which are specific for cable and satellite, DVB-C and DVB-S, they are also
applicable to SMATV systems, DVB-CS, and possibly MMDS systems such as DVB-MC and DVB-MS.
Clause 9 addressed parameters specific to the terrestrial DVB environment (DVB-T).
Clauses 6, 7, 8, and 9 of the present document follow the same structure. For each parameter there is a description of the
purpose of the recommended measurement procedure, the interface to which the measurement instrument should be
applied, and a description of the actual method of the measurement itself.
Apart from these clauses a number of annexes are included, containing recommendations for general aspects, examples
of test set-ups and certain requirements for the test and measurement equipment.
If the interfaces for a described measurement procedure are to be found within the transmitter, the notation is provided
in accordance with figures 4.1 and 9.1 for DVB-T (the 1
st
generation terrestrial DVB system). If the interfaces for the
described measurement procedures are to be found within the receiver (test receiver or IRD), the notation is provided in
accordance with figures 4.2 and 9.2 for DVB-T. These figures illustrate the general cases of a DVB transmitter and
receiver of the 1
st
generation systems, although certain functional blocks only appear in certain systems.
Most of the parameters can be measured with standard equipment such as spectrum analysers or constellation analysers.
Other parameters are defined in a new way as a request to test and measurement equipment manufacturers to integrate
this functionality in their products.