FAQs

FAQs about DSL
What is DSL broadband?
How fast is DSL?
How does the DSL technology work?
How does DSL compare to other technologies?
What is Upstream and Downstream bandwidth?
What is Symmetric/Asymmetric DSL?
Why should I consider getting DSL broadband?
How expensive is DSL?
Is airtel Broadband Services available in my area?
How to change your DNS server?

FAQs about the features and benefits of DSL technology
Do I need a second phone line for airtel Broadband Services?
Why should I choose airtel Broadband Services?
What is an "always on" connection?
How do I share multiple hosts on my DSL line?
Can I have more than on DSL line in my home?
How do I tune my DSL line for maximum performance?

FAQs about the system requirements
System Requirements?
Can I use it on my 28.8k/56k modem with my DSL line?
How does DSL work on my existing phone line?
Why do I need a DSL line if I have an ISDN?
How does DSL compare to cable?
What does a POTS splitter do and when do I need one?
Can DSL service be provided over POTs line connecting to PABX?
Does DSL require a UPS in case of a power failure?
I am rewiring my home, what cabling do I use for DSL?

FAQs about Modem Security
Why is it important to secure modem?
Why do I need a strong wi-fi password?
How do I reset my password on broadband (ADSL) modems?
How do I update my modem firmware?
Why do I need to update my device software regularly?
Is it important to switch off the modem/wi-fi on devices when not in use?
Does using multiple devices affect my data consumption?
What is Centralised Authentication Service (CAS)?

What is DSL broadband?
Simply put, broadband is a high-speed connection to the Internet that is always on. Broadband is faster than a standard dial-up, enabling you to view web content faster and download files more quickly. Besides being faster, broadband is more reliable than dial-up, due to broadband's digital nature and 'always on' connectivity. With broadband, when you turn on your computer, you're already connected to the Internet and ready to surf at high speeds.

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How fast is DSL?
The short answer is "it depends". Typically speeds start at about 128Kbps and go up to 1.5Mbps for most
home users. Some installations may go as fast as 50Mbps or more depending primarily on the equipment used, distances involved, cabling quality, encoding techniques, frequency spectrum available and even to some degree, end system configurations. Be aware that some DSL is sold as asymmetric or "rate-adaptive". It is best to consult the providers in your area as to the access rates available in your area. Speeds can vary from provider to provider even if they are all servicing your area from the same central office.

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How does the DSL technology work?
DSL stands for Digital Subscriber Line - a technology which transforms plain old telephone lines into a high speed conduit for data, information, entertainment and more. It utilizes more of the bandwidth on copper phone lines than what is currently used for plain old telephone service. The DSL technology uses the frequencies above the telephone bandwidth. Therefore on different frequencies one can be on voice and on the Internet simultaneously.

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How does DSL compare to other technologies?
cable modems
Cable modems are devices that attach to the cable TV network connection in a home. This broadband technology is being driven by the cable companies to provide services beyond traditional broadcast cable TV, such as Internet access. Along with DSL, it is still in the early stages of development. There are a number of challenges faced by this industry, including return path capabilities, customer service issues and standards. However, potential bandwidth estimates range upwards of 30Mb/s from the service provider to subscriber. Cable networks are inherently different in design than telephone networks. Cable networks are broadcast oriented, with each subscriber in an area receiving the same signals as all others in that area. DSL is circuit oriented so that each connection is independent of all others. Cable networks are inherently hierarchical in nature and thus require two paths, one for downstream and one for upstream. This requires either a second cable plant for upstream or a second frequency band allocated onto the existing system.

ISDN
ISDN is a telephone company technology that provides digital service typically in increments of 64Kb/s channels. ISDN has been around for many years, but its popularity only recently began to increase due to the limitations of analog modems and the rise of Internet usage. ISDN requires the phone company to install services within their phone switches to support this digitally switched connection service. Roll out of this service initially got off to a slow start and was stalled by high costs, lack of standards and low acceptance rates by consumers. DSL and other new high speed technologies have in many cases "leapfrogged" the ISDN market.

T1
A T1 (E1 is the European near equivalent) line is a 1.544 Mb/s pulse code modulated (PCM) system compromised of 24 time division multiplexed (TDM) channels of 64 Kb/s each. A T1 defines a copper wire interface specification for transmission between a customer and provider. It is not to be confused with a DS1, which is the digital signaling rate of the underlying carrier. Many people however use these terms interchangeably. T1/E1 lines have been used in voice and data networks throughout the world where highly available, high capacity networks needed to be built. In fact, DS1 (or T1) is just one step in hierarchy of systems with higher speeds (e.g. T3/DS3). In many cases, T1 lines have been installed for end users who require dedicated high speed bandwidth between their home and work (or Internet). T1/E1 cabling requirements are more stringent than that of DSL with the setup costs reflecting the differences in the service. Still a popular solution for many organizations and individuals, typically you will find that this service is considerably more expensive for an end user than DSL or cable modems. However, the service level for T1 lines is usually very high.

voiceband modems
Voiceband modems (or just modems for short) use a telephone network as is. That is, there are no special provisions that are required to use modems in today's telephone networks. Modems allow digital data to flow over the telephone company's traditional telephone network by performing a digital to analog conversion for transmission onto the network and vice versa on the receiving end. The only requirement for modems is that each end of the call must have a compatible modem. In essence, this makes modem connections the most ubiquitous form of data communications available today. However, modems are limited by the telephone company's voice bandwidth service. Current voiceband modem technology is struggling to achieve rates of only 56Kb/s. With only a bandwidth of about 3,000 Hz, there is an extremely finite limit on the amount of data that can be encoded and sent reliably through this network. User requirements far outstrip what modems can obtain today.

wireless
There are a number of different wireless schemes proposed, planned and implemented throughout the world. Wireless access technology takes shape in a number of different forms such as via a satellite TV service provider or a cellular phone network. Wireless systems can provide ubiquitous access to a large number of subscribers in a relatively large area. Bandwidth can range from a few kilobits a second to many megabits and be either symmetrical or asymmetrical. Like all other technologies, there can be deployment issues which may include spectrum licensing, interference, line of sight requirements, noise problems or bandwidth limitations.

DSL
DSL is technology backed by telephone companies to provide next generation high bandwidth services to the home and business using the existing telephone cabling infrastructure. DSL to the home over existing phone lines promises bandwidths up to 9Mb/s or more, but distance limitations and line quality conditions can reduce what will actually be achievable. DSL technologies will use a greater range of frequencies over the telephone cable than the traditional telephone services have used. This in turn allows for greater bandwidth with which to send and receive information. DSL technology is still in the early stages of development with standards and products just getting under way. Driving this market is the competition from competing access providers and the pursuit of your Internet access dollar.

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What is upstream and downstream bandwidth?
Upstream refers to the bandwidth for traffic from the end user PC to the Internet while downstream refers to the bandwidth for traffic from internet to the end user. For Internet surfing, the downstream traffic is much more than upstream traffic.

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What is symmetric/asymmetric DSL?
Symmetric DSL refers to DSL technologies which provide the same bandwidth upstream and downstream. E.g. like HDSL (High Bit Rate DSL), IDSL (ISDN DSL). Asymmetric DSL refers to DSL technologies, which provide higher downstream bandwidth with lower upstream bandwidth. E.g. ADSL.

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Why should I consider getting DSL broadband?
For the sheer speed and power that makes communication easier than ever before and helps you make the most of everything the Internet has to offer.
If that's not reason enough, here are some more:


Very fast connection. DSL delivers Internet easily when you need it.
Always ON. No call charges for just getting connected.
Be able to use the phone for voice calls while surfing, no need to go for additional connection for Internet.

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How expensive is DSL?
It depends on your needs, usage and the kind of solution you go in for. You can get a DSL connection for as low as Rs 300. Choose from a variety of Tariff plans to suite your needs.

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Is airtel broadband service available in my area?
The airtel Broadband Services network is spread across Delhi , Haryana, Madhya Pradesh, Karnataka, Tamil Nadu and Pondicherry . Just go to our coverage page, which provides a detailed listing of areas covered by airtel Broadband Services. Conversely, you can contact our Customer Support.

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Do i need a second phone line for airtel broadband Services?
No you don't! You can surf the net as well as talk on the phone simultaneously. That's the beauty of airtel Broadband Services.

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Why should I choose airtel broadband services?
Whether you are an individual user (@home) or a corporate user (@work) airtel Broadband Services has only the best to offer.
This means that the load on the connection is far less and a high-speed connection is always guaranteed.
Other than that here are the other benefits of an airtel Broadband Service connection:


Amazingly quick, always-on connection
Dedicated bandwidth
No additional telephone bills for internet usage
Ability to make phone calls abroad through the internet
Talk while you surf
Robust installation of underground cables
Attractively priced and scalable usage plan options
24x7x365 customer support
airtel's dedication to customer service & telecom superiority

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What is an "always on" connection?
Basically, the single-click airtel Broadband Services ensures fast connectivity, so the Internet is on and ready when you need it.
airtel Broadband Services enables you to establish a dedicated connection between your computer at your home or business location and our Network. This connection can be established with a simple click of the mouse and only takes 1-2 seconds, so there is no more waiting while your computer gets connected to our network. Unlike 'Dial Up' where often you can get a busy tone, and not get connected, DSL connection is assured.

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How do I share multiple hosts on my DSL line?
To do so is largely dependent on how your DSL line is terminated to your CPE. If your provider gives you an Ethernet interface and multiple static IP addresses (many do), then you can simply use a 10BASE-T hub to connect a number of stations as you have IP addresses. After that, it gets more complex. If you have at least one valid IP address, you will need some type of gateway, proxy and/or network address translation (NAT) device. Matters are complicated further if your provider does not issue static IP addresses, which causes your gateway to require re-configuration each time the external IP address changes.

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Can I have more than one DSL line in my home?
Yes, generally this is not a problem. The telephone company will provide as many lines, each on a separate copper pair into your house as you want. This may get expensive, but it has been done many times.

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How do I tune my DSL line for maximum performance?
There is little you can do to really tune your DSL line. You're generally relying on the cabling plant installed in your house all the way through to the provider's network. Since many types of DSL service can run over what is jokingly referred to as CAT-0 cable, your speed is typically determined at provisioning time. If you are rewiring your home, it of course does make sense to perform a high quality wiring installation.

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System requirements?
In case of residential customers having only one PC, the USB modem will connect to the PC that should have the following configuration:

Windows 98 2nd Edition & above
Operating System Windows 98 and above
RAM 64 MB or more
USB port
The USB modems supplied by Bharti are not compatible with Windows Xp 64 bit, Linux,Macintosh & Vista
Any Pentium Machine with Windows 98 and above
Of course, better the PC configuration; the performance of graphics-based services like Gaming, etc will be better. In case of corporate customers using the DSL router connected to the LAN, there is no such restriction..

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Can I use it on my 28.8k/56k modem with my DSL line?
Theoretically yes. If a splitter was used, you could use a traditional modem over the voiceband frequency spectrum of your phone line as you always did. In most cases however, the line is dedicated for DSL

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How does DSL work on my existing phone line?
DSL is really a feature added to your existing phone line.
Data signals and voice signals travel at different frequencies. The DSL splitter segregates the two signals to put the voice calls on to the telephone, and the data traffic on to the PC through the DSL modem.

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Why do I need a DSL line if I have an ISDN?
DSL is an option preferred over ISDN for the following reasons:

It is a scalable service, flexible and easily upgradeable
If you need speeds beyond 128 Kbps you will need DSL
DSL sends data and voice over the same line so you can talk on the phone while you are connected to the Internet.

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How does DSL compare to cable?
Cable is a shared Network, which means that everybody in your neighbourhood uses the same Bandwidth, which causes it to be real slow for you, especially during peak times. DSL is dedicated access. That means that you will get the same speed each and every time you launch your browser.
Cable connection has security risks since many are sharing the same link, which is not the case in case of DSL connection.

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What does a POTS splitter do and when do I need one?
Splitter helps to separate the voice signals from the data signals. It is a passive device, which does not require power, so that the "life-line" voice service can be provided, as has been in the past.

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Can DSL service be provided over POTs line connecting to PABX?
Yes. Splitter is installed on the POTS line before the PABX. The splitters gives two connections, one will go to the PABX for voice and another to the DSL CPE for data traffic, similar to a non PABX environment.

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Does DSL require a UPS in case of a power failure?
There are two types of CPEs, one which need a power supply and one which does not. One which requires a power supply needs a UPS connection, the other of course needs no power supply.

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I'm rewiring my home, what cabling do I use for DSL?
You do not need any special cabling. Although you can run DSL service over high grade CAT-5 cabling, it is not necessary. However, it doesn't hurt either.

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Why is it important to secure modem?
Having a secure modem reduces the possibility of any potential online threat and also secures the data on your computer/devices. Secure your internet connection and stay tension free!

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Why do I need a strong wi-fi password?
If someone hops on to your wi-fi, then there is more at stake than just checking e-mails or streaming videos. This person can intercept all the data flowing in and out of your network. To prevent any unauthorized use, use a sufficiently strong password. A strong password consists of at least six characters (and the more characters, the stronger the password) that are a combination of letters, numbers and symbols (@, #, $, %, etc.). Passwords are typically case-sensitive, so a strong password contains letters in both uppercase and lowercase.

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How do I reset my password on broadband (ADSL) modems?
To reset your password please refer the following links
For Dlink Modem : Click here
For Beetal/Binatone Modem : Click here


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How do I update my modem firmware?
Make sure your modem firmware is updated from time to time to get optimum performance. These updates are available at the modem manufacturer’s website. Below are links for some top selling modem companies:
1.Binatone : Click here
2.Dlink : Click here
3.Beetel : Click here


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Why do I need to update my device software regularly?
HDTV, handheld devices and smartphones, all these devices have miniature computers built-in. So, just like your computer, these devices too need periodic updating for better performance. Virus on your computer or laptop may lead to consumption of more data. Install a good antivirus to safeguard your computer and enjoy a better internet experience.

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Is it important to switch off the modem/wi-fi on devices when not in use?
Switch off the modem when not in use as it not only saves electricity, but improves your network security. When the device is off, hackers cannot target them.
A lot of websites and apps keep consuming data, even when you are not using them, thus is it important to turn off the wi-fi on your devices when not in use.


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Does using multiple devices affect my data consumption?
When multiple devices like smartphones, tablets, PCs, laptops, HDTVs are latched on to a single wi-fi, the data consumption significantly increases. Be aware of the devices connecting to your wi-fi and turn off the wi-fi on the device when not in use as most apps and a lot of websites keep consuming data, even when you are not using them.

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What is Centralised Authentication Service (CAS)?
Anybody who knows your wi-fi key can access it. However, with CAS, you can choose upto 4 devices which can only access your wi-fi through centralized authentication.
To know more, please speak with our customer care executive. Call at 121 from your airtel fixedline or dial <3 digit STD code> 44444121 or <4 digit STD code> 4444121

 
 
 

 


Note:Calls made to numbers beginning with 1860XXXXXXXX is chargeable upto Rs.2/min

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