using vdsl2 over copper in the vertical string
DESCRIPTION
Using VDSL2 over Copper in the Vertical String. Copper, a traditional view. Serial Link. ‘0’ and ‘1’ are transmitted as pulses. Depending on transmission speed , this will only work for a limited distance of twisted pair due to:. Dispersion. High Frequency Attenuation. - PowerPoint PPT PresentationTRANSCRIPT
Peter Jansweijer et al. Slide 1VLVnT08 ToulonApril 23, 2008
Using VDSL2 over Copperin the Vertical String
Peter Jansweijer et al. Slide 2VLVnT08 ToulonApril 23, 2008
Copper, a traditional viewSerial Link
• Dispersion• High Frequency Attenuation
‘0’ and ‘1’ are transmitted as pulses
Depending on transmission speed, this will only work for a limited distance of twisted pair due to:
Peter Jansweijer et al. Slide 3VLVnT08 ToulonApril 23, 2008
ADSL, ADSL2, ADLS2plusAsymmetric Digital Subscriber Line
VDSL, VDSL2Very high speed Digital Subscriber Line
Want to provide “Triple Play”(Voice, Video, Data)
OpticalNetworkUnit
CopperDSL
OpticalLineTerminal
Fiber
OpticalDistributionNetwork
OpticalNetworkTerminal
Telecommunications Industry
Today, most subscribers are connected via copper
Replacing copper by fiber is a major investment
Peter Jansweijer et al. Slide 4VLVnT08 ToulonApril 23, 2008
Bandwidth up + down stream total: 200 Mbps
25 KHz – 30 MHz
VDSL2
Source:http://www.infineon.com//upload/Document/VDSL2_WP_072005_v1.1.pdf
500 Meter VDSL2:100 Mbps downstream10 Mbps upstream
Rate/Reach Performance
Peter Jansweijer et al. Slide 5VLVnT08 ToulonApril 23, 2008
ADSL / VDSLOFDM Orthogonal Frequency Division Multiplexing
Frequency
Am
pli
tud
e
Peter Jansweijer et al. Slide 6VLVnT08 ToulonApril 23, 2008
ADSL / VDSL
All intelligence in a single chip:
Peter Jansweijer et al. Slide 7VLVnT08 ToulonApril 23, 2008
Vertical String Architecture
OpticalModule
OpticalModule
OpticalModule
MasterModule
Fiber
~ 5
00 M
tr
100 Mbps
10 Mbps
Estimated Bandwidth:
• 20 Mbps per Optical Module
One Single Twisted Pair per Optical Module:• Bi-directional Data Transport• DC - Power
• Packet overhead and safety factor 5 100 Mbps per Optical Module
• 24 Optical Modules per Vertical String 2.4 Gbps <=
3.1625 Gbps
one / Vertical Stringin a DWDM system
Peter Jansweijer et al. Slide 8VLVnT08 ToulonApril 23, 2008
VDSL does not have a fixed latency
Are all problems solved?
Store and Forward Data Acquisition System
Create a Time Stamp at the origin of an Event
Need a Local Clock in each Optical Module
Synchronous
Timing Calibration
How?Calibrated
Peter Jansweijer et al. Slide 9VLVnT08 ToulonApril 23, 2008
Timing Calibration Over CopperTake a carrier above the VDSL2 Bandwidth (> 30 MHz)
Time /
Length
Synchronous: Local Clock is Phase locked to Shore Station
MasterModule
ModulatedMaster Module
Carrier
Calibrationsignal
Length = ‘n’ * TCarrierPeriod + Phase Difference
-Phase
Calibration: OpticalModule
Peter Jansweijer et al. Slide 10VLVnT08 ToulonApril 23, 2008
Branch Cable
OM
JunctionBox A
MasterModule
TXa RXb
RXa TXb
OM
ab
OM
OM
OM
MasterModule
OM
ab
OM
OM
JunctionBox B
Add & Drop Multiplexer
Redundancy
Peter Jansweijer et al. Slide 11VLVnT08 ToulonApril 23, 2008
Telescope Overview
ShoreStation
JunctionBox B
JunctionBox A
Branch Cable2 DWDM fibers + Copper (Power)
Master Module ofa Vertical String
2 Long distanceElectro/Optical Cables
16 DWDM Fibers + Copper (Power)
Peter Jansweijer et al. Slide 12VLVnT08 ToulonApril 23, 2008
Summary
VDSL2 is a cost effective, high bandwidth solution for aVertical String
Need extra functionality to incorporate timingover Copper
Power, Data, Timing over a single twisted Pair
Just one / Vertical String
Need extra functionality to couple timing calibrationover Copper <-> timing over fiber
Total telescope can be read out via 16 DWDM fibers
Telescope
Vertical String
Peter Jansweijer et al. Slide 13VLVnT08 ToulonApril 23, 2008
Thank you