Development of home broadband

1. Need for Bandwidth : 64kbps to 100mbps
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
Welcome to my presentation
• Data and voice network sub-merging
• How internet access technology is evolving
• ADSL technology and related protocols
• Network elements and services
Presented by:: Tapos Saha

2. Need for Bandwidth : 64kbps to 100mbps
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
• 1836 Morse code - the first electronic communication
• ASCII code processed by machine - Telex & Tele-printer
• 1876 Alexander Graham Bell -invented practical telephone
• 1920 After first world war the early system was developed
• First routed network was born
• Introduction of modem
• 1924 Harry Nyquist - Total pulse is the double of channel
bandwidth
• 1970 the first codec technology was commercially available
• PAM, PCM, TDM
• Human Speech 4khz, 2x4000 = 8000 bits
• 8bitsx 8000 = 64kbps
• 30 voice channels + Signalling and Sync = 32 channels
• 2.048 mbps, E1 link
• ISDN
Presented by:: Tapos Saha

3. Need for Bandwidth : 64kbps to 100mbps
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
ADSL is:
■ Asymmetric, because data transmission is faster
downstream to the subscriber than upstream from the
subscriber,
■ Digital, because even voice and video are digitized before
they are transmitted as modulated analogue representations of
digital data,
■ Subscriber Line, because data is carried over a single
twisted pair copper ‘loop’ to the subscribers premises.
Presented by:: Tapos Saha

4. Need for Bandwidth : 64kbps to 100mbps
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
Cont…
■ ADSL Modem (ADSL Transmission Unit Remote, ATU-R)
■ ADSL Transmission Unit Central Office (ATU-C)
■ DSL Access Multiplexor (DSLAM)
■ ADSL Splitter
Presented by:: Tapos Saha

5. Need for Bandwidth : 64kbps to 100mbps
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
Cont…
ADSL Performance
■ The greater the line length, the greater the attenuation.
■ Crosstalk from other wires in the same bundle, for instance
other T1 lines, depending on their relative position;
■ RF interference from AM radio, amateur radio bands, and
Interference from other sources.
ADSL cannot be
transmitted on a line with
load coils or Digital
Loop Carriers(DLCs).
Presented by:: Tapos Saha

6. Need for Bandwidth : 64kbps to 100mbps
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
Cont…
DMT modulation
■ DMT splits the frequency band used into multiple sub-carriers
(bins).
■ Capture from DMT tool - Signal susceptible to noise
Presented by:: Tapos Saha

7. Need for Bandwidth : 64kbps to 100mbps
1 www.alcatel-lucent.com/vdsl2-vectoring
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
How much bandwidth is enough?
■ By 2015 it will be 50Mbps and 2020 it will be 100Mbps1
■ VDSL2 had the potential to reach 100 Mbps. But noise among
the lines in a cable reduced performance.
■ VDSL2 Vectoring is noise-canceling technology.
Presented by:: Tapos Saha

8. Need for Bandwidth : 64kbps to 100mbps
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
Cont…
■ It works a lot like noise-canceling headphones. It cuts out all
of the noise, or interference, among the VDSL2 lines in a bundle.
■ Alcatel-Lucent ISAM (Intelligent Services Access Manager)
Series are capable of vectoring and pair-bonding.
Presented by:: Tapos Saha

9. Need for Bandwidth : 64kbps to 100mbps
1 The Broadband Forum, August 2009, Next Generation Broadband Access White Paper MR-185 Issue
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
Future Proofing Broadband Network Infrastructure1
For an architectural framework for broadband service delivery,
regardless of what the access option is—copper, fiber, or wireless.
The key elements are always the same:
-Network termination ((residential gateway (RG), ONT,
-base transceiver station (BTS)) at the customer side
- First node for last mile drop (access node, aggregation switch)
-First IP edge ((Broadband Remote Access Server (B-RAS),
-Broadcast Network Gateway (BNG))
Presented by:: Tapos Saha

10. Need for Bandwidth : 64kbps to 100mbps
Overview
Data & Voice
ADSL
VDSL
Triple Play
Thank You
Questions?
Presented by:: Tapos Saha