07-10-2010, 03:34 PM
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Changes in the Cable Network
-The cable network was designed to deliver TV signals in one direction from the Head-End to the subscribers homes
-To provide TV services Cable Operators had to recreate a portion of the over-the-air radio frequency (RF) spectrum within a sealed coaxial cable line
-Operators had to upgrade the cable network so that signals could flow in both directions
Changes in the Cable Network
-Cable Operators assign a spectrum of signal frequencies to the cable network
-One spectrum is used for the signals that move from the Head-End towards the cable subscriber
-Another spectrum of signal frequencies are used for the signals that move from the cable subscriber towards the Head-End
Changes in the Cable Network
-By replacing existing one way amplifiers with two way amplifiers Cable Operators are able to separate the upstream and downstream signals and amplify each direction separately in the right frequency range
How Fast is a Cable Modem?
-Cable modem speeds vary widely
Depends on the cable modem system
Cable network architecture
Traffic load.
-In the downstream direction (from the network to the computer), network speeds can be up to 27 Mbps
BUT, this is an aggregate amount of bandwidth that is shared by users.
Internet Access via Cable TV
Changes in the Cable Network
-The cable network was designed to deliver TV signals in one direction from the Head-End to the subscribers homes
-To provide TV services Cable Operators had to recreate a portion of the over-the-air radio frequency (RF) spectrum within a sealed coaxial cable line
-Operators had to upgrade the cable network so that signals could flow in both directions
Changes in the Cable Network
-Cable Operators assign a spectrum of signal frequencies to the cable network
-One spectrum is used for the signals that move from the Head-End towards the cable subscriber
-Another spectrum of signal frequencies are used for the signals that move from the cable subscriber towards the Head-End
Changes in the Cable Network
-By replacing existing one way amplifiers with two way amplifiers Cable Operators are able to separate the upstream and downstream signals and amplify each direction separately in the right frequency range
How Fast is a Cable Modem?
-Cable modem speeds vary widely
Depends on the cable modem system
Cable network architecture
Traffic load.
-In the downstream direction (from the network to the computer), network speeds can be up to 27 Mbps
BUT, this is an aggregate amount of bandwidth that is shared by users.