57622186 bsnl training report sarthak gupta
TRANSCRIPT
IEC COLLEGE OF ENGINEERING& TECHNOLOGY
GR. NOIDA
INDUSTRIAL TRAINING REPORT
BHARAT SANCHAR NIGAM LIMITED,JAMMU (J&K Circle)
Submitted To:
Mr. Tushar Giri Head Of Department Computer Science & Engineering
Submitted By:
Sarthak Gupta (0609010092)Computer Science & Engineering
IVth Year (Section – B)
BHARAT SANCHAR NIGAM LIMITED(A Govt. of India Enterprise)
O/O CHIEF GENERAL MANAGER TELECOMJ & K CIRCLE, JAMMU
No. GM/Admin/08-09/27 Dated 01-Aug-09
TO WHOMSOEVER IT MAY CONCERN
This is to certify that Mr. Sarthak Gupta, Roll No. 0609010092 student of B.Tech III Year Computer Science, IEC College Of Engineering & Technology, Greater Noida has successfully completed six weeks Industrial Training in BSNL at Jammu (starting from 9th June 2008 to 1st August 2008) under the supervision of this office.
His performance has been observed in the field of Software Programming and Networking as commendable. He will be an asset to any organization.
I wish him all success in every walks of life.
Anupam Gupta
General Manager (Administration)
TABLE OF CONTENTS
1. PREFACE
2. INTRODUCTION
3. COMPANY PROFILE
4. SERVICES
5. SECTIONS
I. MOBILE SECTION
II. E-10B SWITCHING
III. OCB SWITCHING
IV. MDF
V. TRANSMISSION SECTION
VI. MICROWAVE
VII. POWER STATION
VIII. BROAD BAND
6. COSTUMER CARE
7. BIBLIOGRAPHY
PREFACE
B.TECH program is one of the most reputed professional courses in the
Industry. There is an Industrial Training as an integral part of B.TECH. As
a complementary to that everyone has to submit a report on the work
conducted in the industry.
This report is thus prepared for the training done at Bharat
Sanchar Nigam Limited (B.S.N.L). The organization shall make all possible
efforts to have a secure and safe domain. The data/information is very
important and most critical to the business requirements; therefore
proper measures should be adopted so that the information is well
secured and protected.
Sarthak Gupta
B.TECH
INTRODUCTION
Bharat Sanchar Nigam Ltd. formed in October, 2000, is World's 7th largest
Telecommunications Company providing comprehensive range of telecom
services in India: Wire line, CDMA mobile, GSM Mobile, Internet, Broadband,
Carrier service, MPLS-VPN, VSAT, VoIP services, IN Services etc.
Bharat Sanchar Nigam Limited (known as BSNL, India Communications
Corporation Limited) is a public sector communications company in India. It is
the India's largest telecommunication company with 24% market share. Its
headquarters are at Bharat Sanchar Bhawan, New Delhi. It has the status of
Mini-ratna - a status assigned to reputed Public Sector companies in
India.BSNL has installed Quality Telecom Network in the country and now
focusing on improving it, expanding the network, introducing new telecom
services with ICT applications in villages and wining customer's confidence.
Today, it has about 47.3 million line basic telephone capacity, 4 million WLL
capacity, 20.1 Million GSM Capacity, more than 37382 fixed exchanges,
18000 BTS, 287 Satellite Stations, 480196 Rkm of OFC Cable, 63730 Rkm of
Microwave Network connecting 602 Districts, 7330 cities/towns and 5.5 Lakhs
villages. BSNL is the only service provider, making focused efforts and
planned initiatives to bridge the Rural-Urban Digital Divide ICT sector. In fact
there is no telecom operator in the country to beat its reach with its wide
network giving services in every nook & corner of country and operates across
India except Delhi & Mumbai including inaccessible areas of Siachen glacier
and North-eastern region of the country.
BSNL cellular service, CellOne, has more than 17.8 million cellular customers,
garnering 24 percent of all mobile users as its subscribers. That means that
almost every fourth mobile user in the country has a BSNL connection. In basic
services, BSNL is miles ahead of its rivals, with 35.1 million Basic Phone
subscribers i.e. 85 per cent share of the subscriber base and 92 percent share in
revenue terms. BSNL has more than 2.5 million WLL subscribers and 2.5
million Internet Customers who access Internet through various modes viz.
Dial-up, Leased Line, DIAS, and Account Less Internet (CLI). BSNL has been
adjudged as the NUMBER ONE ISP in the country.
BSNL has set up a world class multi-gigabit, multi-protocol convergent IP
infrastructure that provides convergent services like voice, data and video
through the same Backbone and Broadband Access Network. At present there
are 0.6 million DataOne broadband customers. The company has vast
experience in Planning, Installation, network integration and Maintenance of
Switching & Transmission Networks and also has a world class ISO 9000
certified Telecom Training Institute. BSNL plans to expand its customer base
from present 73 millions lines to 125 million lines and infrastructure
investment plan to the tune of Rs. 733 crores (US$ 16.67 million) in the next
three years. Today, BSNL is India's largest Telco and one of the largest Public
Sector Undertaking with estimated market value of $ 100 Billion. The company
is planning an IPO with in 6 months to offload 10% to public in the Rs 300-400
range valuing the company at over $100 billion.
COMPANY PROFILE
Company Name: Bharat Sanchar Nigam Ltd.
Type : Public
Founded : 19th century, incorporated 2000
Headquarters : Bharat Sanchar Bhawan, Harish Chandra
Mathur Lane, Janpath, New Delhi
CMD: R K Upadhyay
Industry: Telecommunications
Status: Mini Ratan (a status assigned to reputed public
sector companies in India.)
Products: Wireless, Telephone, Internet, Television
Revenue: US$ 9.67 billion (2007)
Owner(s): The Government of India
Website : Bsnl.co.in
SERVICES
BSNL provides almost every telecom service in India. Following are the
main telecom services provided by BSNL:
Universal Telecom Services : Fixed wireline services &
Wireless in Local loop (WLL) using CDMA Technology called
bfone and Tarang respectively. As of December 31, 2007,
BSNL has 81% market share of fixed lines.
Cellular Mobile Telephone Services: BSNL is major
provider of Cellular Mobile Telephone services using GSM
platform under the brand name BSNL Mobile[2]. As of March
31, 2007 BSNL has 17% share of mobile telephony in the
country.
Internet: BSNL provides internet services through dial-up
connection (Sancharnet) as Prepaid, (NetOne) as Postpaid and
ADSL broadband (BSNL Broadband). BSNL has around 50%
market share in broadband in India. BSNL has planned
aggressive rollout in broadband for current financial year.
Intelligent Network (IN): BSNL provides IN services like
televoting, toll free calling, premium calling etc.
SECTIONS
The BSNL is divided into following sections:
IX. MOBILE SECTION
X. E-10B SWITCHING
XI. OCB SWITCHING
XII. MDF
XIII. TRANSMISSION SECTION
XIV. MICROWAVE
XV. POWER STATION
XVI. BROAD BAND
XVII. COSTUMER CARE
Mobile Section
In this section we learnt how mobile communication takes
place.
There are two ways by which mobile communication takes place,
GSM
CDMA
The Basic Transmission Procedure:
1. BSC: Base Station Controller
2. BTS: Base Station TRANSCEIVER
3. MSC: Mobile Switching Center
4. HLR: Home Location Register
5. VLR: Visitor Location Register
6. AUC: Authentication Center
7. EIR: Equipment Identity Register
8. SC: Short Message Center
9. OMC: Operation and Maintenance Center
E-10B (ELECTRONICS - 10 BINARY)
Here we came to know about function of:--
OMC: -- Operation maintenance centre.
OC:--Monitoring unit.
ETA:--Frequency sender and receiver.
URM:--Multiplex connection unit.(5 unit)
CSE:--Subscriber connection unit.
DSF:--Stand by charge unit.
MR:--Multiresistor (5 unit)
MQ:--Marker (2 unit)
TR:--Translator (2 unit)
TX:--Tax (charging unit) (2 unit)
RLM:--Remote lining unit.
COM:--Switching module.
CX: -- Switching unit.
TAX (Trunk auto exchange)
This section deals when a caller picks up the receiver, gets the dial
tone and how the call is made and processed.
Transmission
The call is transmitted from telephone to:
Caller
/
D.P
/
Pillar
/
MDF
/
Exchange
/
Tax
/
Exchange
/
MDF
\
Pillar
\
D.P
\
Receiver
There are two types of media:
Guided Media (OFC)
Un-Guided Media.
BROADBAND
A trend of changes in telecommunication technology is
very fast. The need of hour is large bandwidth and its optimum
utilization at reasonable cost. 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 256kbps will come under category of broadband access.
Equipment's required in customer premises are
• Filter:-The filter separates out the signal for telephone.
(Called as Splitter)
• Modem:-The modem directs the signal to PC and TV.
• Set Top Box (STB)-The STB converts the digital IP based
signal to a form compatible with the TV set.
• PC and TV
What is DSL?
• A high speed digital communication line
• Has several advantages over other high speed
communication solutions.
• DSL runs on existing copper
• DSL helps carriers reduce congestion on their voice-
switching systems
• Very high speed.
Data Card
There are two type of data card:
1. IX data card (speed -144kbps (max))
2. E-VDO data card (speed - 2Mbps)
OCB EXCHANGE SYSTEM
Salient Features:
OCB stands for organ control bhersion.
Digital switching system developed by CIT ALCATEL of France.
OMC & S/N duplicated.
Varieties of service provided are: basic telephony, ISDN, Mobile,
Videotext etc.
Supports different types of signaling system.
Max. no. of junctions may be 60000 and 35 types of cards can be
used.
Less space requirement.
Automatic fault recovery and remote monitoring.
Environmental requirement is not very stringent.
MAJOR UNITS OF OCB SYSTEM
Subscriber Connection Unit (CSN)
A CSN basically consists of 1 basic rack and 3 extension racks
capacity of CSN is 5000.Subs may be analog and digital.
TRUNK & JUNCTION CONNECTION UNIT (SMT)
It is the interface between switching network and junctions from other
exchanges (or remote connection unit).
SWITCHING MATRIX
The Switching matrix is a single stage ‘t’ made up of host switching
matrix and branch selection & amplification function, SMX is
duplicated.
AUXILLIARY EQUIPMENT CONTROL STATION
(SMA)
It consists of frequency receiver/generator conference call CCTS, tone
generators etc.
CONTROL UNIT (SMC)
The six control units are as under:
Multi register (MR) for connecting and disconnecting calls.
Translator (TR) for storing exchange database.
Charging unit (TX) for carrying out charging jobs.
Marker (MQ) for performing connection & disconnection of
subscribers.
Ccs-7 controller (PC) for carrying out routing & traffic
management functions.
Matrix system handler (GX) for monitoring connection in S/N.
OPERATION & MAINTENANCE UNIT (SMM)
It is OMC for supervising functions of different units and for
taking suitable actions at the event of faults. Magnetic disks each of
capability 1.2 GB for various stages.
In the field of telecommunications, a telephone exchange or telephone
switch is a system of electronic components that connects telephone
calls. A central office is the physical building used to house inside
plant equipment including telephone switches, which make phone
calls "work" in the sense of making connections and relaying the
speech information.
MOBILE COMMUNICATION
Mobile phones send and receive radio signals with any number of cell site
base stations fitted with microwave antennas. These sites are usually
mounted on a tower, pole or building, located throughout populated areas,
then connected to a cabled communication network and switching
system. The phones have a low-power transceiver that transmits voice
and data to the nearest cell sites, normally not more than 8 to 13 km
(approximately 5 to 8 miles) away.
When the mobile phone or data device is turned on, it registers with the
mobile telephone exchange, or switch, with its unique identifiers, and can
then be alerted by the mobile switch when there is an incoming telephone
call. The handset constantly listens for the strongest signal being received
from the surrounding base stations, and is able to switch seamlessly
between sites. As the user moves around the network, the "handoffs" are
performed to allow the device to switch sites without interrupting the call.
Cell sites have relatively low-power (often only one or two watts) radio
transmitters which broadcast their presence and relay communications
between the mobile handsets and the switch. The switch in turn connects
the call to another subscriber of the same wireless service provider or to
the public telephone network, which includes the networks of other
wireless carriers. Many of these sites are camouflaged to blend with
existing environments, particularly in scenic areas.
The dialogue between the handset and the cell site is a stream of digital
data that includes digitized audio (except for the first generation analog
networks). The technology that achieves this depends on the system
which the mobile phone operator has adopted. The technologies are
grouped by generation. The first-generation systems started in 1979 with
Japan, are all analog and include AMPS and NMT. Second-generation
systems, started in 1991 in Finland, are all digital and include GSM,
CDMA and TDMA.
The nature of cellular technology renders many phones vulnerable to
'cloning': anytime a cell phone moves out of coverage (for example, in a
road tunnel), when the signal is re-established, the phone sends out a 're-
connect' signal to the nearest cell-tower, identifying itself and signaling
that it is again ready to transmit. With the proper equipment, it's possible
to intercept the re-connect signal and encode the data it contains into a
'blank' phone -- in all respects, the 'blank' is then an exact duplicate of the
real phone and any calls made on the 'clone' will be charged to the
original account.
Third-generation (3G) networks, which are still being deployed, began in
2001. They are all digital, and offer high-speed data access in addition to
voice services and include W-CDMA (known also as UMTS), and
CDMA2000 EV-DO. China will launch a third generation technology on
the TD-SCDMA standard. Operators use a mix of predesignated
frequency bands determined by the network requirements and local
regulations.
In an effort to limit the potential harm from having a transmitter close to
the user's body, the first fixed/mobile cellular phones that had a separate
transmitter, vehicle-mounted antenna, and handset (known as car phones
and bag phones) were limited to a maximum 3 watts Effective Radiated
Power. Modern handheld cell phones which must have the transmission
antenna held inches from the user's skull are limited to a maximum
transmission power of 0.6 watts ERP. Regardless of the potential
biological effects, the reduced transmission range of modern handheld
phones limits their usefulness in rural locations as compared to car/bag
phones, and handhelds require that cell towers be spaced much closer
together to compensate for their lack of transmission power.
Some handhelds include an optional auxiliary antenna port on the back of
the phone, which allows it to be connected to a large external antenna and
a 3 watt cellular booster. Alternately in fringe-reception areas, a cellular
repeater may be used, which uses a long distance high-gain dish antenna
or yagi antenna to communicate with a cell tower far outside of normal
range, and a repeater to rebroadcast on a small short-range local antenna
that allows any cell phone within a few meters to function properly.
GSM
Global System for Mobile communications (GSM: originally from
Groupe Special Mobile) is the most popular standard for mobile phones
in the world. Its promoter, the GSM Association, estimates that 82% of
the global mobile market uses the standard. GSM is used by over 3
billion people across more than 212 countries and territories. Its ubiquity
makes international roaming very common between mobile phone
operators, enabling subscribers to use their phones in many parts of the
world. GSM differs from its predecessors in that both signaling and
speech channels are digital, and thus is considered a second generation
(2G) mobile phone system. This has also meant that data communication
was easy to build into the system.
The ubiquity of the GSM standard has been an advantage to both
consumers (who benefit from the ability to roam and switch carriers
without switching phones) and also to network operators (who can choose
equipment from any of the many vendors implementing GSM). GSM also
pioneered a low-cost, to the network carrier, alternative to voice calls, the
Short message service (SMS, also called "text messaging"), which is now
supported on other mobile standards as well. Another advantage is that
the standard includes one worldwide Emergency telephone number, 112.
This makes it easier for international travellers to connect to emergency
services without knowing the local emergency number. Newer versions
of the standard were backward-compatible with the original GSM phones.
For example, Release '97 of the standard added packet data capabilities,
by means of General Packet Radio Service (GPRS). Release '99
introduced higher speed data transmission using Enhanced Data Rates for
GSM Evolution (EDGE).
GSM is a cellular network, which means that mobile phones connect to it
by searching for cells in the immediate vicinity. GSM networks operate in
four different frequency ranges. Most GSM networks operate in the 900
MHz or 1800 MHz bands. Some countries in the Americas (including
Canada and the United States) use the 850 MHz and 1900 MHz bands
because the 900 and 1800 MHz frequency bands were already allocated.
The rarer 400 and 450 MHz frequency bands are assigned in some
countries, notably Scandinavia, where these frequencies were previously
used for first-generation systems.
GSM-900 uses 890–915 MHz to send information from the mobile
station to the base station (uplink) and 935–960 MHz for the other
direction (downlink), providing 124 RF channels (channel numbers 1 to
124) spaced at 200 kHz. Duplex spacing of 45 MHz is used. In some
countries the GSM-900 band has been extended to cover a larger
frequency range. This 'extended GSM', E-GSM, uses 880–915 MHz
(uplink) and 925–960 MHz (downlink), adding 50 channels (channel
numbers 975 to 1023 and 0) to the original GSM-900 band. Time division
multiplexing is used to allow eight full-rate or sixteen half-rate speech
channels per radio frequency channel. There are eight radio timeslots
(giving eight burst periods) grouped into what is called a TDMA frame.
Half rate channels use alternate frames in the same timeslot. The channel
data rate is 270.833 kbit/s, and the frame duration is 4.615 ms.
The transmission power in the handset is limited to a maximum of 2 watts
in GSM850/900 and 1 watt in GSM1800/1900.
GSM has used a variety of voice codecs to squeeze 3.1 kHz audio into
between 5.6 and 13 kbit/s. Originally, two codecs, named after the types
of data channel they were allocated, were used, called Half Rate
(5.6 kbit/s) and Full Rate (13 kbit/s). These used a system based upon
linear predictive coding (LPC). In addition to being efficient with bit
rates, these codecs also made it easier to identify more important parts of
the audio, allowing the air interface layer to prioritize and better protect
these parts of the signal.
GSM was further enhanced in 1997 with the Enhanced Full Rate (EFR)
codec, a 12.2 kbit/s codec that uses a full rate channel. Finally, with the
development of UMTS, EFR was refactored into a variable-rate codec
called AMR-Narrowband, which is high quality and robust against
interference when used on full rate channels, and less robust but still
relatively high quality when used in good radio conditions on half-rate
channels.
There are five different cell sizes in a GSM network—macro, micro, pico,
femto and umbrella cells. The coverage area of each cell varies according
to the implementation environment. Macro cells can be regarded as cells
where the base station antenna is installed on a mast or a building above
average roof top level. Micro cells are cells whose antenna height is
under average roof top level; they are typically used in urban areas.
Picocells are small cells whose coverage diameter is a few dozen meters;
they are mainly used indoors. Femtocells are cells designed for use in
residential or small business environments and connect to the service
provider’s network via a broadband internet connection. Umbrella cells
are used to cover shadowed regions of smaller cells and fill in gaps in
coverage between those cells.
Cell horizontal radius varies depending on antenna height, antenna gain
and propagation conditions from a couple of hundred meters to several
tens of kilometers. The longest distance the GSM specification supports
in practical use is 35 kilometers (22 mi). There are also several
implementations of the concept of an extended cell, where the cell radius
could be double or even more, depending on the antenna system, the type
of terrain and the timing advance.
Indoor coverage is also supported by GSM and may be achieved by using
an indoor picocell base station, or an indoor repeater with distributed
indoor antennas fed through power splitters, to deliver the radio signals
from an antenna outdoors to the separate indoor distributed antenna
system. These are typically deployed when a lot of call capacity is needed
indoors, for example in shopping centers or airports. However, this is not
a prerequisite, since indoor coverage is also provided by in-building
penetration of the radio signals from nearby cells.
The modulation used in GSM is Gaussian minimum-shift keying
(GMSK), a kind of continuous-phase frequency shift keying. In GMSK,
the signal to be modulated onto the carrier is first smoothed with a
Gaussian low-pass filter prior to being fed to a frequency modulator,
which greatly reduces the interference to neighboring channels (adjacent
channel interference).
Network structure
The network behind the GSM system seen by the customer is large and
complicated in order to provide all of the services which are required. It is
divided into a number of sections and these are each covered in separate
articles.
The Base Station Subsystem (the base stations and their
controllers).
The Network and Switching Subsystem (the part of the network
most similar to a fixed network). This is sometimes also just called
the core network.
The GPRS Core Network (the optional part which allows packet
based Internet connections).
All of the elements in the system combine to produce many GSM
services such as voice calls and SMS
The structure of a GSM network.
Subscriber Identity Module
One of the key features of GSM is the Subscriber Identity Module (SIM),
commonly known as a SIM card. The SIM is a detachable smart card
containing the user's subscription information and phone book. This
allows the user to retain his or her information after switching handsets.
Alternatively, the user can also change operators while retaining the
handset simply by changing the SIM. Some operators will block this by
allowing the phone to use only a single SIM, or only a SIM issued by
them; this practice is known as SIM locking, and is illegal in some
countries.
Many operators lock the mobiles they sell. This is done because the price
of the mobile phone is typically subsidized with revenue from
subscriptions, and operators want to try to avoid subsidizing competitor's
mobiles. The locking applies to the handset, identified by its International
Mobile Equipment Identity (IMEI) number, not to the account (which is
identified by the SIM card). In some countries such as India, all phones
are sold unlocked.
GSM security
GSM was designed with a moderate level of security. The system was
designed to authenticate the subscriber using a pre-shared key and
challenge-response. Communications between the subscriber and the base
station can be encrypted. The development of UMTS introduces an
optional USIM, that uses a longer authentication key to give greater
security, as well as mutually authenticating the network and the user -
whereas GSM only authenticated the user to the network (and not vice
versa). The security model therefore offers confidentiality and
authentication, but limited authorization capabilities, and no non-
repudiation. GSM uses several cryptographic algorithms for security. The
A5/1 and A5/2 stream ciphers are used for ensuring over-the-air voice
privacy. A5/1 was developed first and is a stronger algorithm used within
Europe and the United States; A5/2 is weaker and used in other countries.
Serious weaknesses have been found in both algorithms: it is possible to
break A5/2 in real-time with a cipher text-only attack, and in February
2008, Pico Computing, Inc revealed its ability and plans to commercialize
FPGAs that allow A5/1 to be broken with a rainbow table attack. The
system supports multiple algorithms so operators may replace that cipher
with a stronger one.
Base Transceiver Station (BTS)
Base Transceiver Station (BTS) is the equipment which facilitates the
wireless communication between user equipments (UE) and the network.
UEs are devices like mobile phones (handsets), WLL phones, computers
with wireless internet connectivity, WiFi and WiMAX gadgets etc. The
network can be that of any of the wireless communication technologies
like GSM, CDMA, WLL , WAN, WiFi, WiMAX etc. BTS is also
referred to as RBS (Radio Base Station), Node B (in 3G Networks) or
simply BS (Base Station).
Though the term BTS can be applicable to any of the wireless
communication standards, it is generally and commonly associated with
mobile communication technologies like GSM and CDMA. In this
regard, a BTS forms part of the Base Station Subsystem (BSS)
developments for system management. It may also have equipments for
encrypting and decrypting communications, spectrum filtering tools
(band pass filters) etc. Antennas may also be considered as components
of BTS in general sense as they facilitate the functioning of BTS.
Typically a BTS will have several transceivers (TRXs) which allow it to
serve several different frequencies and different sectors of the cell (in the
case of sectorised base stations). A BTS is controlled by a parent Base
Station Controller via the Base station Control Function (BCF). The BCF
is implemented as a discrete unit or even incorporated in a TRX in
compact base stations. The BCF provides an Operations and Maintenance
(O&M) connection to the Network management system (NMS), and
manages operational states of each TRX, as well as software handling and
alarm collection. The basic structure and functions of the BTS remains
the same regardless of the wireless technologies.
BROADBAND
Broadband in telecommunications refers to a signaling method that
includes or handles a relatively wide range of frequencies, which may be
divided into channels or frequency bins. Broadband is always a relative
term, understood according to its context. The wider the bandwidth, the
greater the information-carrying capacity. In radio, for example, a very
narrow-band signal will carry Morse code; a broader band will carry
speech; a still broader band is required to carry music without losing the
high audio frequencies required for realistic sound reproduction. A
television antenna described as "normal" may be capable of receiving a
certain range of channels; one described as "broadband" will receive
more channels. In data communications a modem will transmit a
bandwidth of 56 kilobits per seconds (kbit/s) over a telephone line; over
the same telephone line a bandwidth of several megabits per second can
be handled by ADSL, which is described as broadband (relative to a
modem over a telephone line, although much less than can be achieved
over a fiber optic circuit, for example).
In data communications
Broadband in data communications can refer to broadband networks or
broadband Internet and may have the same meaning as above, so that data
transmission over a fiber optic cable would be referred to as broadband as
compared to a telephone modem operating at 56,000 bits per second.
However, broadband in data communications is frequently used in a more
technical sense to refer to data transmission where multiple pieces of data
are sent simultaneously to increase the effective rate of transmission,
regardless of actual data rate. In network engineering this term is used for
methods where two or more signals share a medium.
In video
Broadband in analog video distribution is traditionally used to refer to
systems such as cable television, where the individual channels are
modulated on carriers at fixed frequencies. In this context, baseband is
the term's antonym, referring to a single channel of analog video,
typically in composite form with an audio subcarrier. The act of
demodulating converts broadband video to baseband video.
However, broadband video in the context of streaming Internet video has
come to mean video files that have bitrates high enough to require
broadband Internet access in order to view them.
Broadband video is also sometimes used to describe IPTV Video on
demand.
In DSL
The various forms of Digital Subscriber Line (DSL) services are
broadband in the sense that digital information is sent over a high-
bandwidth channel above the baseband voice channel on a single pair of
wires.
In Ethernet
A baseband transmission sends one type of signal using a medium's full
bandwidth, as in 100BASE-T Ethernet. Ethernet, however, is the
common interface to broadband modems such as DSL data links, and has
a high data rate itself, so is sometimes referred to as broadband. Ethernet
provisioned over cable modem is a common alternative to DSL
BSNL is in the process of commissioning of a world class, multi-gigabit,
multi-protocol, convergent IP infrastructure through National Internet
Backbone-II (NIB-II), that will provide convergent services through the
same backbone and broadband access network. The Broadband service
will be available on DSL technology (on the same copper cable that is
used for connecting telephone), on a countrywide basis spanning 198
cities.
In terms of infrastructure for broadband services NIB-II would put India
at par with more advanced nations. The services that would be supported
includes always-on broadband access to the Internet for residential and
business customers, Content based services, Video multicasting, Video-
on-demand and Interactive gaming, Audio and Video conferencing, IP
Telephony, Distance learning, Messaging: plain and feature rich, Multi-
site MPLS VPNs with Quality of Service (QoS) guarantees. The
subscribe will be able to access the above services through Subscriber
Service Selection System (SSSS)portal.
OBJECTIVES
To provide high speed Internet connectivity (upto 8 Mbps)
To provide Virtual Private Network (VPN) service to the
broadband customers
To provide dial VPN service to MPLS VPN customers.
To provide multicast video services, video-on-demand, etc.
through the Broadband Remote Access Server (BRAS).
To provide a means to bill for the aforesaid services by either time-
based or volume-based billing. It shall provide the customer with
the option to select the services through web server
To provide both pre-paid and post paid broadband services.
TECHNICAL CAPABILITY
The Broadband Service will be given through the state of the art Multi
Protocol Label Switching (MPLS) based IP Infrastructure, which is
designed to provide reliable routes to cover all possible destinations
within and outside the country. Layer 1 of the network will consist of
a high speed Backbone comprising of 24 powerful Core Routers
connected with high speed 2.5 Gbps (STM-16) links. The routers are
located on the national DWDM network interfacing at STM-16 optical
level to provide for high transmission speeds.
Advantage of MPLS over other Technologies
MPLS VPN is a technology that allows a service provider like BSNL to
have complete control over parameters that are critical to offering its
customers service guarantees with regard to bandwidth throughputs,
latencies and availability.
Services available through Broadband
High speed Internet Access: This is the always-on Internet access
service with speed ranging from 256 kbps to 8 Mbps.
Bandwidth on Demand: This will facilitate customer to change
bandwidth as per his / her requirement. For example a customer
with 256 kbps can change to 1 Mbps during the video
Conferencing session.
Multicasting: This is to provide video multicast services for
application in distance education, telemedicine etc
Dial VPN Service: This service allows remote users to access their
private network securely over the NIB-II infrastructure.
Video and Audio Conferencing:
Content based Services: Like Video on Demand, Interactive
Gaming, Live and time shifted TV
BIBLIOGRAPHY
Wikipedia
Bsnl