[Yanbu]

Hi,


GOOD DAY,


I want to ask if it is possible to have FULL 1 GHz CATV system. Currently, all our distribution amplifiers are 1 GHz, but our Head-end equipment is still 870 MHz.


Can we upgrade the Head-end to have 1 GHz? are the equipment available in the market? "I wasn't able to find 1 GHz modulators and combiners".


Also, are the TVs nowadays ready for 1 GHz reception?

 

[egnlsn]

Do you really need 1GHz?


If the first 450MHz (61 channels) is taken up by analog channels, that leaves 420MHz (70 NTSC channels) in your 870MHz system for digital content. There are usually 10-12 SD (QAM) channels or 2-3 HD channels (QAM) on one NTSC channel. That's up to 840 SD channels or 210 HD channels or a combination of SD/HD channels in your 870MHz system. That's a lot of channel space.


To answer your question, though, if ALL of the actives (amps) AND passives (splitters, directional couplers) are 1GHz, then all that would need to be done would be to add some 1GHz gear in the headend. If it was not done at the time the system was built, you would want to have it swept to 1GHz. If you stay at 870MHz, if it has not been done for some time, you would want to have it swept to 870MHz.

 

[olyteddy]

IMHO the bandwidth limiting factor in most CATV systems is the return. Most systems still only have 35 MHz of reverse (5MHz to 40MHz). If I had a system, I'd eliminate the first 100MHz or so (channels 2 through 6 and FM) and change out the diplexers to add that spectrum to the return. That would allow internet upload speeds to approach download speeds and open the door for more and better interactive services. Just a thought...

 

[Yanbu]

Thaaaaaaaaaaaanks alot.


It is really helpful.

 

[olyteddy]

You might also take a look at this forum: http://www.cabl.com/ , especially the Broadband -> Technical sub forum.