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Using VDSL2 over Copper in the Vertical String

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.

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Using VDSL2 over Copper in the Vertical String

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  1. Using VDSL2 over Copperin the Vertical String

  2. 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

  3. Telecommunications Industry Want to provide “Triple Play” (Voice, Video, Data) ADSL, ADSL2, ADLS2plus Asymmetric Digital Subscriber Line VDSL, VDSL2 Very high speed Digital Subscriber Line Optical Line Terminal Today, most subscribers are connected via copper Replacing copper by fiber is a major investment Optical Distribution Network Optical Network Unit Optical Network Terminal Fiber Copper DSL

  4. VDSL2 Bandwidth up + down stream total: 200 Mbps 25 KHz – 30 MHz Rate/Reach Performance 500 Meter VDSL2: 100 Mbps downstream 10 Mbps upstream Source: http://www.infineon.com//upload/Document/VDSL2_WP_072005_v1.1.pdf

  5. ADSL / VDSL OFDM Orthogonal Frequency Division Multiplexing Amplitude Frequency

  6. ADSL / VDSL All intelligence in a single chip:

  7. Vertical String Architecture 10 Mbps Optical Module One Single Twisted Pair per Optical Module: • Bi-directional Data Transport • DC - Power Optical Module 100 Mbps Estimated Bandwidth: ~ 500 Mtr • 20 Mbps per Optical Module Optical Module • Packet overhead and safety factor 5 100 Mbps per Optical Module • 24 Optical Modules per Vertical String 2.4 Gbps <= Master Module 3.1625 Gbps Fiber one l / Vertical String in a DWDM system

  8. Are all problems solved? VDSL does not have a fixed latency Store and Forward Data Acquisition System Create a Time Stamp at the origin of an Event Need a Local Clock in each Optical Module Timing Calibration How? Synchronous Calibrated

  9. Timing Calibration Over Copper Take a carrier above the VDSL2 Bandwidth (> 30 MHz) Synchronous: Local Clock is Phase locked to Shore Station Calibration: Optical Module Modulated Master Module Carrier Calibration signal Time / Length Master Module d-Phase Length = ‘n’ * TCarrierPeriod + Phase Difference

  10. Branch Cable OM OM Redundancy OM OM Master Module Master Module a a b b OM OM OM OM Junction Box A Junction Box B TXa RXb TXb RXa Add & Drop Multiplexer

  11. Telescope Overview Branch Cable 2 DWDM fibers + Copper (Power) Master Module of a Vertical String Junction Box A Junction Box B Shore Station 2 Long distance Electro/Optical Cables 16 DWDM Fibers + Copper (Power)

  12. Summary Vertical String VDSL2 is a cost effective, high bandwidth solution for a Vertical String Need extra functionality to incorporate timing over Copper Power, Data, Timing over a single twisted Pair Just one l / Vertical String Telescope Need extra functionality to couple timing calibration over Copper <-> timing over fiber Total telescope can be read out via 16 DWDM fibers

  13. Thank you

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