CEI CLC/TR 50083-2-2

BILINGUAL

General

Standards and deliverables of EN 50083
(all parts) and EN 60728 (all parts) deal with cable networks
including equipment and associated methods of measurement for
headend reception, processing and distribution of television and
sound signals and for processing, interfacing and transmitting all
kinds of data signals for interactive services using all applicable
transmission media. These signals are typically transmitted in
networks by frequency-multiplexing techniques.

For instance, this includes

a) regional and local broadband cable
networks,

b) extended satellite and terrestrial
television distribution systems,

c) individual satellite and terrestrial
television receiving systems,

and all kinds of equipment, systems and
installations used in such cable networks, distribution and
receiving systems.

The extent of this standardization work
is from the antennas and/or special signal source inputs to the
headend or other interface points to the network up to the terminal
input of the customer premises equipment.

The standardization work will consider
coexistence with users of the RF spectrum in wired and wireless
transmission systems. The standardization of any user terminals
(i.e. tuners, receivers, decoders, multimedia terminals etc.) as
well as of any coaxial, balanced and optical cables and accessories
thereof is excluded.

Specific scope of CLC/TR
50083-2-2

The radiated fields produced by LTE Base
Stations (LTE-BS) need special and careful attention when received
by individual or community antenna television systems because of
high level signals injected at the input port of wideband
amplifiers placed on the antenna mast or in the headend. These high
level disturbing signals in the 800 MHz band are able to cause
interference problems by producing overload and/or strong
intermodulation products in wide band amplifiers and to disturb or
even prevent the reception of digital television signals (DVB-T)
broadcast in VHF/UHF bands.

This interference problem, in a frequency
band previously assigned to terrestrial television broadcasting and
now to broadband telecommunication services, can be avoided or
reduced both with an appropriate suitable screening efficiency of
cable network and equipment and by using an appropriate and
suitable filter (LTE filter) to attenuate the 800 MHz band signals
received by the television antenna system and injected (conducted
interference) at the input port of wideband amplifiers.

Some examples of EMC requirements
relating to LTE-BS disturbing signals are described (see Clause 7)
and the main characteristics of a typical LTE filter (see Clause 8)
are indicated.

These additional EMC requirements for
cable networks and equipment, resulting from the assignment of the
800 MHz band to LTE services, are based on:

a) the expected field strengths in the
800 MHz band due to both LTE User Equipment (LTE-UE) and LTE Base
Station (LTE-BS), considered as disturbing signals;

b) the field strengths planned for
terrestrial television broadcasting in the UHF band, up to 790 MHz
(e.g. ch. 60),

c) the required protection of television
signals with respect to both LTE-UE and LTE-BS disturbing
fields.

Both LTE-BS disturbing effects and LTE-UE
disturbance effects and protection requirements are therefore
considered in this technical report.