11-07-2012, 11:35 AM
Broadband Access Technologies
[attachment=27417]
What is Broadband Access ?
Any data access rate more than 2Mbps is considered as broadband access.
As per the recent broadband policy of Govt. of India, access rate over 256 Kbps will come under category of broadband access.
Why Broadband ?
Fast development in information technology field has yielded in applications which are bandwidth hungry.
Inclusion of more and more graphics and video content in applications require high speed access to network.
Network operators are trying to carry real-time traffic like voice and live video over data infrastructure to facilitate a unified network for all type of traffic.
Asymmetric DSL (ADSL)
Allows simultaneous access to the line by the telephone and the computer
In case of power/ADSL failure, data transmission is lost but basic telephone service will be operational
Provides
16-640 kbps upstream
1.5-8 mbps downstream
Can work up to a distance of 2.7 to 5.5 kms depending upon the speed required
SDSL
Symmetric Digital Subscriber Line
Rate adaptive version of HDSL
Does not support analog calls
Works up to 3.7 kms on 0.5 mm dia cable
Affordable alternative to dedicated leased lines
SHDSL-Symmetric High-bit-rate Digital Subscriber Line is an further improvement over HDSL/SDSL and uses single phone line
Cable Modem
The cable network was designed to deliver TV signals in one direction from the Head-End to the subscribers homes
Operators had to upgrade the cable network so that signals could flow in both directions
One spectrum is used for the signals that move from the Head-End towards the cable subscriber
[attachment=27417]
What is Broadband Access ?
Any data access rate more than 2Mbps is considered as broadband access.
As per the recent broadband policy of Govt. of India, access rate over 256 Kbps will come under category of broadband access.
Why Broadband ?
Fast development in information technology field has yielded in applications which are bandwidth hungry.
Inclusion of more and more graphics and video content in applications require high speed access to network.
Network operators are trying to carry real-time traffic like voice and live video over data infrastructure to facilitate a unified network for all type of traffic.
Asymmetric DSL (ADSL)
Allows simultaneous access to the line by the telephone and the computer
In case of power/ADSL failure, data transmission is lost but basic telephone service will be operational
Provides
16-640 kbps upstream
1.5-8 mbps downstream
Can work up to a distance of 2.7 to 5.5 kms depending upon the speed required
SDSL
Symmetric Digital Subscriber Line
Rate adaptive version of HDSL
Does not support analog calls
Works up to 3.7 kms on 0.5 mm dia cable
Affordable alternative to dedicated leased lines
SHDSL-Symmetric High-bit-rate Digital Subscriber Line is an further improvement over HDSL/SDSL and uses single phone line
Cable Modem
The cable network was designed to deliver TV signals in one direction from the Head-End to the subscribers homes
Operators had to upgrade the cable network so that signals could flow in both directions
One spectrum is used for the signals that move from the Head-End towards the cable subscriber