Modern Smatv/matv Systems

By: Dipol

Exchange of the main installation equipment in a building requires considerable financial outlays. It is also a challenge for the residents. It is the reason why such exchange should be avoided. The original cabling has to survive the test of time - the cables used should provide maximum number of available services. They have to ensure good parameters not only in FM/TV bands, but also in satellite IF band (950-2400 Mhz), and in back channel (5-60 MHz). It will enable the residents to have access to satellite broadcasts (with IF/IF converters or multiswitches), as well as to the Internet.

The diagram of an installation working up to 2.4 GHz is similar to that up to 862 MHz, but one should avoid to use pass-through layout that is not suitable for employing multiswitches. Of course, all passive components of the installation have to work within 0.05-2.4 GHz frequency band.
The optimum topology (star network) consists in connecting cables from every outlet to the central point, e.g. the box in the staircase where there is a multi-output tap. This solution allows easy installation of packet filters in the future, as well as is both more fail-safe and easier to service.

All staircases are connected with a splitter, or in the case of larger number of subscribers, there are used additional amplifiers that form two-stage installation.

It is also recommended to prepare the installation for connecting cable TV that offers a whole spectrum of services these days. There will be needed place for the box for building amplifier that, in the case of providing cable TV, will take over the function of channel amplifiers used in MATV installation.

It is worth to consider leading two coaxial cables from the basement to the node(s), which ensures easier and cheaper bundling of services into packages - only two filters are needed for the most popular division into basic and premium packages.

Schemes and more details:
http://www.dipolnet.com/dipol_weekly_review_-_tv_and_sat_tv_cctv_wlan_inf_dipo_2007_33.htm#04

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