Broadband Access Technologies

M. Satish

Mini project on

09P31A0486

DEPARTMENT OF

ELECTRONICS AND

COMMUNICATION ENGINEERING

What is Broadband?

As per DOT:Broadband is an “An always-on data

connection that is able to support interactive services, and has the capability of minimum download speed of 256 kbps”

Note: This definition for throughput may undergo upward changes in the future.

Existing Internet Service

Categorized as Narrowband Service:

Dial up Internet Service (PSTN + ISDN)

Direct Internet Access Service (DIAS)

Internet Leased Line Service

BROADBAND ACCESS:

Broadband communications technology can be divided broadly into

wireline technologies

wireless technologies.

Wire line & Wire less 3G Mobile Wi-Fi (Wireless

Fidelity) , Wi-max (World wide

interoperability for microwave access)

LMDS (Local multi point distribution system.)

MMDS FSO (Free Space Optics) Satellite

DSL (Digital Sub’s Line) Cable Modem Optical Fibre

Technologies

PON, FTTH, FTTB, FTTC

PLC (Power Line Communication)

DSL Technology DSL may offer more than 100 times the network

performance of a traditional analog modem DSL uses the same telephone line as traditional

modem Provides simultaneous access to Web &

Telephone removing the need for a second telephone line.

DSL remains always-on all the time Customer no longer need to physically dial up

to the ISP to “log in to the internet” On power failure, telephone line is still available

like a standard telephone line.

DSL Family Tree DSL

Symmetric DSL Provide identical data rates upstream &

downstream Asymmetric DSL

Provide relatively lower rates upstream but higher rates downstream

ADSL is upgraded as:

ADSL 2

ADSL 2+

ADSL FEATURES :Family Description Upsterea

mRate

Downstream Rate

Max.range

ADSL G,992.1 / G.DMT 640 KBps 8 MBps 5.5 Km

June1999

ADSL2 G.992.3 / G.dmt 1-1.5 MBps

12-16 MBps

5.7 Km

July2002

ADSL2 + G.992.5 / ADSL 2 plus

1 MBps 25 MBps 5.7 Km

May 2003

ADSL Deployment Today

SPLITTERS

Central OfficeHome/Office

ADSLCPE

Curb

ADSL up to 5Km

SHDSL (PAM16) up to 5Km

SHDSL

SplitterDSLAM

Data switch

Voice Switch

POTS2 wire

2 wire

Advantages of Broadband

Always on ( Not on shared media)

Fast (speed ranging from 256 kbps)

No disconnection

No additional access charge

Telephone and Data simultaneously

Multiplay Network Components

BNG – Broadband Network Gateway

RPR – Resilient Packet Ring

OC LAN – Other City Local Area Network

DSLAM – Digital Subscriber Line Access

Multiplexer

CPE –Customer Premises Equipment

Broadband Multiplay – A1 & A2 Cities

NOC, DRNOC, RPOP

Broadband Multiplay – OC Type Cities

Services available through Broadband

 • High speed Internet Access: This is the always-on Internet

access service with speed ranging from 256 kbps to 24 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, video-on-demand etc. 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.

Services on IPTV • Live TV

– Broadcasted Programs; support for multicast video delivery.

• Time shifted TV

– Schedule less television;

– Allows current or previously broadcasted programs any time

• Near VoD (N-VOD)

– Channels are created, scheduled and run by the operator in staggered manner.

– Staggered channels are played at certain delay from original channel.

– A subscriber purchases a “ticket” and can access all the channels running the same movie in multicast. The channels are so phased that by pressing “FF” or “RW” the subscirber can switch the channels and skip number of minutes back or forth giving him a near VOD experience.

ERRORS:

-Error 678

-Error 691

-Error 769

-Error 797

-Error 718

-Error 630-633

Error 678• This is most common problems. • It is due to poor connectivity. • Problem can be anywhere between B.RAS - Tier 2 - DSLAM -

Modem - PC of the customer.• Remedy:• Switch off / Switch on Modem (Power Switch at the back of

modem ) and wait for 2 minutes. Then retry. • If problem is not solved then Reset Modem• If problem is still not solved then

a)If DSL lamp is blinking, then it is line problem. b)Check Modem to splitter connectivity.i) Jack in & Jack out the cable of / to the modem and to the splitterii)Jack in & Jack out the telephone connection of the splitter.  

•  

Error 691• User id and Password problem. • Broadband Team will reset the password and intimate that

password has been reset.

Error 769• LAN not enabled.• Remedy: The LAN Card has to be enabled by

following the steps given below.i)Go to Desktop.ii)Click "My Network Place".iii)Select Properties.iv)Click "Enable the local network".

Error 797• Modem or LAN driver problem• Reset the Modem (in on condition ) • If the problem is not solved then check computer LAN

Card driver.Error 718• Peak Hour - This problem occurs if loading is high on

the system and number of customers exceed the call handling capacity of B.RAS.

 Error 630-633• Computer LAN Card problem.• LAN Card has to be changed.  

Important Do's and Don’ts for BSNL Broadband customers

• Do's• 1. No phone/Fax should be connected before

splitter.• 2. Change your password regularly• 3. Check your usages detail regularly. • 4. Please clean your computer virus regularly.• 5. Please switch off modem when not in use. • Don’ts:• Please do not disclose your broadband User ID

and Password to anybody.

Any Queries?

Thank You