Broadband and Broadband Services
In toady’s globally networked society through internet, there is always increasing demand for higher capacity systems and more bandwidth for new services & networking, hence new various types of access technologies for broadband have to be found for this exponential growth. Prior to broadband service, PSTN dialup (including ISDN) was the main technique to get Internet access. For high speed, only alternative was lease line bandwidth. Even today, PSTN dialup service is prevalent. BSNL offers many options for dialup Internet account such as Sancharnet (pre-paid) and Netone (CLI based) service. Sancharnet is an all India roaming account i.e. user can use it from any landline in India. The dialup charges are payable on landline whereas, Internet usage gets deducted from Sancharnet account. The download speed depends on quality of PSTN line and goes up to 56Kbps limited by capacity of modem used. For Internet access, BSNL also offers Unlimited plan on postpaid CDMA and usage based for prepaid CDMA service.
What is Broadband?
TRAI has defined Broadband as an always on data connection that is able to support interactive services including internet access and has the capability of the minimum download speed of 256 kbps to an individual subscriber from the point of presence (POP) of the service provider intending to provide broadband service where multiple such individual broadband connection are aggregated and the subscriber is able to access these interactive services including the internet through this POP. The interactive services will exclude any services for which separate license is specifically required, for example, real time voice transmission, except to the extent that it is presently permitted under ISP license with Internet telephony.
Advantages of Broadband
• Always on (Not on shared media)
• Fast (speed ranging from 256 kbps to 2 Mbps)
• No disconnection
• No additional access charge
• Telephone and Data simultaneously
• Fat pipe has to be continuously supplemented with value added applications to enjoy the advantage.
Wired Broadband Technologies:
There are many different types of broadband access technologies. Each of these technologies can compete to provide similar services to consumers and businesses.
• Digital Subscriber Line (DSL, given over copper loop of Telecom operators) • Cable Modem (CM, Given over cable TV operators coaxial cable network) • Power Line Broadband (BPL, Over Power lines)
• Fiber technology
Digital Subscriber Line (DSL)
Digital Subscriber line (DSL) is a wire line transmission technology that brings data and information faster over copper telephone lines already installed in homes and business. Traditional phone service connects your home or business to a telephone company office via copper wires. A DSL modem accesses the local telephone company’s central office where a DSL Access DSLAM then transmits the signal from the copper telephone line onto a network backbone, and eventually to the Internet. With high speed Internet access that uses DSL transmission technology, there is no need to “dial in” to a traditional modem. This service allows consumers and business to have an “always-on” dedicated connection to the Internet. The following are types of DSL transmission technologies that may be used to provide high-speed Internet access.
Symmetrical Digital Subscriber Line (SDSL)
It is used typically for business applications such as video conferencing. The traffic from the user to the network is upstream traffic, and from the network to the user is downstream traffic. When the data rate in both directions is equal, it is called a symmetric service.
Asymmetrical Digital Subscriber Line (ADSL)
It is used primarily by residential users who receive a lot do data but do not send much such as Internet surfers. ADSL provides faster speed in a downstream...