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Ethernet over VDSL Technical Specifications

Ethernet over VDSL Technical Specifications. Agenda. Rate – Reach Band Allocation SNR and BER PSD mask and Power Backoff Algorithm Rate Limitation Splitters and Filters. Rate – Reach. Data rate - reach is limited by channel capacity theorem Wire gauge: bigger is better The trade off:

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Ethernet over VDSL Technical Specifications

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  1. Ethernet over VDSLTechnical Specifications

  2. Agenda • Rate – Reach • Band Allocation • SNR and BER • PSD mask and Power Backoff Algorithm • Rate Limitation • Splitters and Filters

  3. Rate – Reach • Data rate - reach is limited by channel capacity theorem • Wire gauge: bigger is better • The trade off: • The longer the distance the lower the bit rate • The shorter the distance the higher bit rate

  4. Rate - Reach • The effects of Wire attenuation and Far End Cross Talk (FEXT) increase with higher frequencies • Multiple services (ADSL, E1, ISDN) and multiple EoV links in the same bundle are significant noise sources

  5. ETSI Compliance, Long Reach • The EoV solution is capable of dynamically allocating the carrier rate: • Compliance with ETSI 997 and 998 band allocation • Achieving longer distance of 2 - 2.5Km with 4 Mbps symmetrical

  6. Band Allocation PSD [dbm/hertz] 997 Plan 1 2 1 2 F [Mhz] 0.138 Mhz 3.0 Mhz 5.1 Mhz 7.05 Mhz 12.0 Mhz PSD [dbm/hertz] 998 Plan 1 2 1 2 F [Mhz] PSD [dbm/hertz] EoV 1 1 F [Mhz] 0.9 Mhz 3.75 Mhz 8.0 Mhz 0.138 Mhz 3.75 Mhz 5.1 Mhz 8.5 Mhz 12.0 Mhz 1 PSD [dbm/hertz] Long Reach EoV 1 F [Mhz] 0.6 Mhz 2.0 Mhz 2.3 Mhz 4.8 Mhz

  7. Band allocation 1 • EoV assumes ISDN, ADSL or SHDSL may be operating on the same line POTS, BA-ISDN PSD [dbm/hertz] ADSL SHDSL -40 EoV -60 1 -80 F [Mhz] <0.12 Mhz 0.9 Mhz 3.75 Mhz 8.0 Mhz

  8. Band Allocation PSD [dbm/hertz] 997 and 998 Plans -60 F [Mhz] 1 2 0.138 Mhz 3.75 Mhz 5.1 Mhz 8.5 Mhz 12.0 Mhz Other services ETSI Plains 997 and 998 assumes no ISDN, ADSL or SHDSL services on the same line VDSL Downstream 1 2

  9. EoVE - Ethernet over VDSL ETSI compliant • Special implementation of EoV that complies to ETSI 997 and 998 band allocation plans • Special line Hardware supports symmetric 4:4 and 1:1 Mbps • 1:1 band allocation: Downstream 0.9-1.5 Mhz, Upstream 3.75-4.3 Mhz • 4:4 band allocation: Downstream 0.9-3.0 Mhz, Upstream 3.75-5.1 Mhz

  10. EoV compliance to ETSI 997 and 998 plans 1 2 1 2 PSD [dbm/hertz] 1Mbps, Full Duplex -60 1 2 F [Mhz] 997 0.138 0.9 3.75 5.1 8.5 12.0 998 PSD [dbm/hertz] 0.9-1.5 3.75-4.3 EoV 4Mbps, Full Duplex -60 1 2 F [Mhz] 0.138 0.9 3.75 5.1 8.5 12.0 0.9-3.0 3.75-5.1

  11. PSD Mask • The Power Spectrum Density (PSD) is limited to avoid disturbance to other communication systems • The EoV complies with the ETSI VDSL PSD requirements

  12. PSD Mask • Maximum transmit power (upstream and downstream combined) is limited to 11.5dBm. • The ETSI PSD limit values for the PSD masks are: • 40dBm/hz is allowed up to EoV band • 60dBm/hz is allowed in the EoV band • The EoV conforms to the 60dBm/hz limit PSD [dBm/hertz] 40 dBm 60 dBm EoV

  13. EoV PSD Mask EoV transmits at 60 dBm/hz PSD [dbm/hertz] -40 PSD Limit -60 -80 F [Mhz] <0.12 Mhz 0.9 Mhz 3.75 Mhz 8.0 Mhz

  14. Long range EoV • Reach distance of up to 2.4Km over standard telephone lines • Bandwidth of up to 4 Mbps symmetrical • Achieved using the same modem components with different filters

  15. Long Range EoV Band allocation POTS, BA-ISDN PSD [dbm/hertz] ADSL SHDSL Long Reach EoV F [Mhz] <0.12 Mhz 0.6 Mhz 2.0 Mhz 2.3 Mhz 4.8 Mhz

  16. Power Backoff Algorithm • The PBO function causes the NT side to transmit at the minimum possible PSD. • This prevents interference and cross-talk in a mix of short and long loops in the same cable. • Modems operating on short loops transmit less power than modems on long loops.

  17. PBO procedure in EoV • The NT starts to transmit, using the minimum level of power defined in the standard • The NT, which is in the “Tune Power Level” state, increases its power level whenever it receives a request from the LT. • The LT sends requests for more power, until convergence is reached on the received signal, with a Signal to Noise Ratio (SNR) that guarantees a 6dB margin at full constellation.

  18. Rate Limitation • EoV supports configuration of line speed for tiered billing purposes • EM2003 modules implement rate limitation through the VDSL carrier in these selectable speeds • 0.7M, 1M, 2M, 3M, 4M, 5.5M, 7.5M, 8.5M, 11M • Future EM2004 modules implement rate limitation in the ASIC in Kbps level increments • Downstream and Upstream can be configured independently of each other • The maximal bandwidth is limited by the physical link

  19. Splitters and Filters • The splitter separates the VDSL signal from low frequency services such as POTS, 2B1Q ISDN, 4B3T ISDN or ping-pong (smart phone) ISDN • The splitter places a Low Pass Filter (ISDN/POTS Splitter) in parallel with a High Pass Filter (VDSL filter) • Combines/separates the Transmit and Receive VDSL signals - Hybrid functionality. • Filters leakage (echo)

  20. Splitters and Filters Telephone Telephone POTS/ISDN Splitter POTS/ISDN Splitter Rx Rx EoV NT Passive Front End EoV LT Passive Front End Tx Tx Ethernet over VDSL

  21. Network layer - Ethernet • EM2003 Supports Layer- 2 Switching • EM2004 Layer 2- 5 Ethernet Circuit switching • Advanced VLAN engine supports up to 4K VLANs • Supports IGMP, DiffServ, port trunking, BootP

  22. Management • Full SNMP management • Supports RMON (groups 1, 2, 3, 9) • Telnet, port mirroring • GUI through MegaVision or other SNMP compliant applications • Web based management through MegaVision

  23. Management • Ethernet over VDSL specific management options • vdsl-set-port-rate - selects speed of VDSL, manually set the Upstream and Downstream. • vdsl-auto-test-ports - sets automatic test for the VDSL links ,which establishes link based on bundle SNR and BER

  24. Management • Statistics and counters • vdsl-set-ber-report - reports Bit Error Rate to the network management system • vdsl-get-port-snr - get the SNR per port • vdsl-get-eth-cnt - gets the Ethernet counters per port

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