P. S. SUNDARAM: The Satellite Television Channels beamed to Indian sub-continent are from several Satellites like New Skies Satellite(NSS) 703, Intelsat 704, Apstar, Thaicom 3, INSAT series satellites - 2B/2E, INTELSAT APR 1, Asiasat 2, Asiasat 3S, Palapa C2 etc. The number of channels those can be received from these satellites exceed more than 100. While many of the services still continue to be analog, new services and some of the old & popular services are in digital mode in MPEG 2 - DVB compatible format. The quality of the signals of many of these broadcast services conform to internal standards. However, few services are much inferior and are of poor quality, mainly due to its poor video source quality.
Despite the good quality of the satellite receive signal, the signal impairment takes place through many of the unscientifically designed cable TV distribution networks in our country. Though Bureau of Indian Standard (BIS) has stipulated the following standards, I am sure many of the Cable TV networks do not adhere to the quality parameters as stipulated in these standards.
The following is the list of the Bureau of Indian Standards
(BIS) for the Cable TV Distribution Network.
1. Cabled Distribution systems for Television and Sound Signals - Specification:
(a) IS 14231 (Part 1) : 1995 - Part 1 Safety Requirements
(b) IS 14231 (Part 2) : 1995 - Part 2 Electromagnetic compatibility for components and systems
(c) IS 14231 (Part 3) : 1995 - Part 3 Active Coaxial Wideband Distribution Components
(d) IS 14231 (Part 4) : 1995 - Part 4 Passive Coaxial Wideband Distribution Components
(e) IS 14231 (Part 5) : 1995 - Part 5 Headend
(f) IS 14231 (Part 6) : 1995 - Part 6 System Performance requirements
2. Satellite Signal Distribution on Cabled Distribution Systems - Specification
(a) IS 14264 : 1995
There are a few networks in the country particularly in Mumbai and Chennai who utilise optical fibre system combined with state-of-the-art distribution components to provide good quality signal to the viewers. Unless the distribution networks are upgraded with the right equipment and cable, the quality of the signal and the number of channels, which could be put through the cable network, will be poor and low.
