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NOBEL WP2 Meeting. CR3 Alcatel CIT Contributions D15 results and D31 continuation Issy-les-Mlnx, 08-10.02.05. D15 main activity. Metro access study case (Milan wide area metro reference network) See reference network in section 6.1.1 Study case description section 6.2.1

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NOBEL WP2 Meeting

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NOBEL WP2 Meeting

CR3 Alcatel CIT Contributions

D15 results and D31 continuation

Issy-les-Mlnx, 08-10.02.05

NOBEL WP2 Feb 05 1


D15 main activity

  • Metro access study case (Milan wide area metro reference network)

    • See reference network in section 6.1.1

    • Study case description section 6.2.1

      • Aim is to find the “optimum” solution for DSLAM traffic backhauling comparing different network archiectures

    • Solution description & Dimensioning results

      • SONET/SDH aggregation ring

      • RPR aggregation ring

      • Star Ethernet

      • Dual Bus Optical Ring Network (DBORN)

      • Dimensioning on different sub-areas comprising different numbers and size of DSLAMs

NOBEL WP2 Feb 05 2


High Level view of compared solutions

RPR

SONET/SDH

Star Ethernet

NOBEL WP2 Feb 05 3


High Level view of compared solutions (1)

DBORN

  • Very similar to existing metro solutions, except:

    • Optical transparency via passive Optical Ethernet A/D

    • Upstream/downstream resource separation

    • Burst Mode equipment for Upstream

  • Very similar to access PONs, except:

    • Ring topology (Protection and Traffic Engineering features)

    • Up to 40km ring

    • « coloured »: WDM/CWDM capacity compatible with metro-access constraints

NOBEL WP2 Feb 05 4


Highlight of Results:e.g. UA2, 8 remote DSLAMs

  • Star Ethernet with GE i/f is efficient in terms of net capacity, not in terms of # of i/f. Upgrade less flexible

  • SONET/SDH (A/D @ STM-1, transport @2.5G): not bad in terms of # of i/f, but not efficient in Net. Capacity as no stat. Mux between nodes.

  • RPR (A/D @ GE, transport @2.5G): efficient in terms of # of i/f and net. Capacity when the total traffic is limited. Less efficient in upgrade due to the lack of transparency.

  • DBORN: more flexibility to choose transport granularity wrt A/D granularity as transparent transit. Surprisingly, 1G transport i/f seems the best trade-off in the study cases. Better support of asymmetric traffic.

NOBEL WP2 Feb 05 5


Global conclusions

  • Point-to-multipoint/Multipoint-to-point solutions seems more adapted than point-to-point solutions:

    • sharing of Metro-core (Mc) Node interfaces to avoid strong threshold effects and mismatching of the node capacity with interface granularity

    • packet add/drop multiplexing between DSLAMs and of broadcasted packets for Video services allows saving transport resources

  • Optical transparency is interesting when traffic is increasing:

    • GE granularity gave better results mainly due to the asymmetry of the traffic (2.5G would be fine for down but overdimensioned for up)

    • flexible out-of-the-line optical interfaces to allows efficiently changing the wavelength allocation during the time for a better sharing of transport resources between the DSLAMs in the time

NOBEL WP2 Feb 05 6


Next studies. Continuation for D31

  • We planned to use as much as possible the CAPEX NOBEL model for a cost comparison of the solutions

    • Most of equipment/infrastructure costs already exist in the current model. Few new costs to be considered (Burst Mode???)

  • No plan for OPEX comparisons but could be foreseen in collaboration with an interested partner

  • Improvement of dimensioning tool to be able to quickly change some network parameters and see the impact in the network comparison

    • Today, global dimensioning of DSLAM resources is automated but wavelength allocation is still done manually !!!

    • Other architectures to be considered

  • Interaction with other partners could enable to enlarge the study case and make it more interesting for the NOBEL community?

Mandatory

Optional

NOBEL WP2 Feb 05 7


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