[elektro-etc] Ez álom vagy valóság =3F?=

[hwsw famulus]

Leto Tokarev wrote:
>> A NET joval  a TV/Radio alatt jon frekiben
>> Talan az also ~10 Mhz-ben ...
>> valami extrem modulacioval
>
> Ez biztos?

Nem biztos, de ilyesmi remlik...

Rakerestem lasd alabb.

Ahogy elnezem nagysebessegu cabelnet
eseten mar belelog a NET a VHF savba
es  az URH radioba is...
Ezert lehet gond a szures a
szokasos kabelTV kiosztas eseten...

KJ

> Leto


Cable TV networks are one way broadcast networks, based on coax cable. We 
distinguish between the download and the upload band-width. Today the 
following frequencies can be used:

  a.. download: 47-450 MHz
  b.. upload: 5-30 MHz
In the future the  so called "Full Service Networks" will increase the 
band-width:
  a.. download: 47/80-862 MHz
  b.. upload: 5-30/65 MHz
The today existing cable TV networks usually do not dispose a backward 
channel.  To use the cable TV networks as a door to Internet, this feature 
has to be implemented first. Since the band-width of the backward channel is 
limited and may not be big enough in a big network island, the cable TV 
provider has to grow up the capacity of the backward channel from some 
distribution centers to the main network via xDSL connections or other added 
connections. In most cases, this connections do not exist yet and they have 
to be built up first. These are the reasons, why this new service is coming 
up step by step from region to region.
With this cable modem technology we can reach speed up to 36MBit/s. The real 
installed modems will allow us maximal download rates between 2 and 4MBit/s. 
On the backward channel upload rates between 64kBit/s and 10MBit/s are 
theoretically possible. In the practice these values are depending on the 
used modems. At present most modems allow down streams up to 3MBit/s and up 
streams between 100 and 800kBit/s. The "Home Works Universal" made by Zenith 
as a special case can work with 4MBit/s in both directions (duplex).