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The term
"broadband" describes a two-way digital service that transmits at least 1.5 Mbps
in at least one direction. By contrast, an ordinary dial-up modem, which currently handles
28.8 or 56 Kbps, is considered a narrowband device. While narrowband is generally adequate
for downloading still images and text, data-rich applications such as video-on-demand
require broadband connections.
Prisma Digital Ltd. (PDL)'s broadband network is
based on a design know as the hybrid fibre coaxial (HFC): optical fibre links the system
headend to network nodes which serves between 500 to 2000 subscribers, and coaxial cables
connecting individual homes to each node. Inside the home, cable signals can be split
between various TV or PC-based devices like a cable TV set-top box and a cable modem. The
HFC architecture automatically results in a network that offers greater channel capacity
improved signal reliability and far-superior two-way transmission capabilities.
Breaking the Barriers
Many cable companies in the U.S. are now upgrading their infrastructure to the HFC system
to support two-way digital service. Recent high profile investments such as the merger of
AT&T and TCI in the U.S. and Bill Gates' funding of various cable ventures and
numerous other investments worldwide are a noteworthy vote of confidence for the potential
of the cable industry's broadband infrastructure.
The Broadband Potential
PDL subscribers have been enjoying cable TV services since 1995. With the completion of
its Bangladesh wide network, PDL is now ready to rollout services beyond cable TV such as
high-speed internet access. In the near future, PDL will also be in a position to deliver
other broadband applications such as:
High-speed internet access on both TV and PC
– Besides the PC, surfing and e-mailing on the TV will be possible through enhanced
set-top boxes.
Electronic program guides (EPG) - This
service integrates broadcast information and material from the Internet. Delivered with
the help of state-of-the-art set-top boxes, EPG services include alerting users when their
favorite programs are coming up, setting the video recorder to record automatically and
also allowing parental control over children's viewing options.
Telecommuting – The home office concept will
become more cost-efficient and accessible with full local area network (LAN) access via
the cable modem.
Videoconferencing – In future, video
conferencing will no longer need to be done in a specialized location. The future home
will be equipped with an advanced set-top box that will allow the user to enjoy this
service in the comfort of his home.
Distance learning –Subscribers will be able
to tap into the vast universe of interactive multimedia sites on the web for research and
educational purposes.
Interactive home shopping and games - Interactive
television will be commonplace in the future with services that allow for virtual online
shopping and easy access to graphic-rich game servers.
News and entertainment-on-demand - users can
download movies, news and sports highlights or enjoy other pay-per-view services offered
on the web.
Telephony – Telecommunications using cable
will be a possibility in the future, whether through remote access via the set-top box,
modem or a wireless connection.
The myriad of services available in the future will
not only enhance our entertainment and communication experience but also change the way we
live, work and play. In the future, every household in Bangladesh will be able to
experience the full potential of the broadband network, all through a single coaxial cable
in the comfort of their home.
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