Using VDSL 2 over Copper in the Vertical

Using VDSL 2 over Copper in the Vertical String April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 1

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 April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 2

Telecommunications Industry Want to provide “Triple Play” (Voice, Video, Data) Today, most subscribers are connected via copper Replacing copper by fiber is a major investment ADSL, ADSL 2, ADLS 2 plus Optical Line Terminal Optical Network Unit Optical Distribution Network Fiber Optical Network Terminal Copper DSL Asymmetric Digital Subscriber Line VDSL, VDSL 2 Very high speed Digital Subscriber Line April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 3

VDSL 2 Bandwidth up + down stream total: 200 Mbps 25 KHz – 30 MHz Rate/Reach Performance 500 Meter VDSL 2: 100 Mbps downstream 10 Mbps upstream Source: http: //www. infineon. com//upload/Document/VDSL 2_WP_072005_v 1. 1. pdf April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 4

ADSL / VDSL Orthogonal Frequency Division Multiplexing Amplitude OFDM Frequency April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 5

ADSL / VDSL All intelligence in a single chip: April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 6

Vertical String Architecture 10 Mbps Optical Module One Single Twisted Pair per Optical Module: • Bi-directional Data Transport 100 Mbps • DC - Power Estimated Bandwidth: • 20 Mbps per Optical Module • Packet overhead and safety factor 5 100 Mbps per Optical Module • 24 Optical Modules per Vertical String 2. 4 Gbps <= 3. 1625 Gbps Fiber April 23, 2008 one l / Vertical String in a DWDM system VLVn. T 08 Toulon Optical Module Master Module Peter Jansweijer et al. Slide 7 ~ 500 Mtr Optical Module

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 Synchronous Calibrated April 23, 2008 VLVn. T 08 Toulon Timing Calibration How? Peter Jansweijer et al. Slide 8

Timing Calibration Over Copper Take a carrier above the VDSL 2 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’ * TCarrier. Period + Phase Difference April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 9

Branch Cable Redundancy OM OM Master Module a a b OM OM Junction Box A b OM OM TXa RXb RXa TXb Junction Box B Add & Drop Multiplexer April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 10

Telescope Overview Branch Cable 2 DWDM fibers + Copper (Power) Master Module of a Vertical String Shore Station Junction Box A Junction Box B 2 Long distance Electro/Optical Cables 16 DWDM Fibers + Copper (Power) April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 11

Summary Vertical String VDSL 2 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 April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 12

Thank you April 23, 2008 VLVn. T 08 Toulon Peter Jansweijer et al. Slide 13