Cost evaluation of the integration of IP/MPLS and WDM elements

Transcription

1 Cost evaluation of the integration of IP/MPLS and WDM elements R. Duque, V. López, A. González, O. González de Dios, J.P. Fernández-Palacios 0 TELEFÓNICA Telefónica Servicios I+D Audiovisuales S.A. / Telefónica España S.A. Título de la ponencia / Otros datos de interés /

2 Cost evaluation of the integration of IP/MPLS and WDM elements R. Duque, V. López, A. González, O. González de Dios, J.P. Fernández-Palacios 1 TELEFÓNICA Telefónica Servicios I+D Audiovisuales S.A. / Telefónica España S.A. Título de la ponencia / Otros datos de interés /

3 Outline 01 Introduction and motivation 02 Scenario Definition 03 Methodology 04 Results 05 Conclusions 2

4 01 Introduction and motivation 3

5 Motivation Some vendors are proposing the integration of coloured transponders in the IP cards reducing the cost of current separate solution. IP Router Grey Interface 2nd window ROADM Colored interface 3rd window Transponder (O/E/O conversion) (a) Independent Colored interface IP Router with integrated transponder 3rd window This situation can lead to a single vendor scenario, which is not convenient for an operator. This study assesses the CAPEX savings due to this integration. ROADM (b) Integrated 3rd window 4

6 02 Scenario definition 5

7 Assumptions Spanish backbone network has 20 ML nodes and 10 ROADMs. Initial total traffic matrix of 1.4 Tbps obtained from internal Telefónica data. Traffic growth of 50% per year has been assumed. A4 A14 A9 A23 E8 E5 A17 A28 B4 B3 E15 B28 B22 B16 B9 D4 C12 C17 C24 C29 D6 C8 C6 D14 E17 D16 E20 D20 D30 E28 6

8 Node Models Separate model Integrated model IP/MPLS Router Line Cards Transceiver SR Transceiver SR WDM Transponder Tx Tx Rx Tx λ 1 Rx Rx Tx Rx λ 1 Chassis WDM Termninals IP/MPLS Transponders IP/MPLS Router Line Cards Transceiver LR Tx Rx Tx Rx λ 1 λ 1 OXC Chassis IP/MPLS OXC 7

9 Cost model Based on STRONGEST model: Includes FW card and transceivers costs IP/MPLS Router Line Cards (including FW card) Transceiver SR Transceiver SR Tx Tx Rx Rx Rx Tx WDM Transponder Tx Rx λ 1 λ 1 WSS WSS Chassis WDM Termninals Slots/ Ports Relative Cost IP/MPLS line cards 40GbE IP/MPLS line cards 100GbE 4 40 IP/MPLS line cards 400GbE IP single chassis IP multi-chassis WDM Transponder 40Gbps WDM Transponder 100Gbps 1 16 WDM Transponder 400Gbps WDM terminal (chassis) Photonic Switch. WSS 1x20 - TS 20 6 WSS 9x9 - OC 9 48 WSS 1x9 - LS 9 4 Amplification (Amp) 0.8 OXC OXC cost mainly depends on number of WSSs OXC cost = N (2 WSS 1x9 + 2 Amp) + 2 N AD(20) WSS 1x WSS 9x9 8

10 03 Methodology 9

11 Methodology Topology Demand Cost model IP Routing IP equipment IP cost evaluation IP chassis IP cards IP/WSON adaptation Interlayer connections Optical demand WSON RWA Transport equipment Transport cost evaluation Transponders chassis WDM transponders OXC = f(wss) 10

12 Traffic routing The traffic matrix is created based on the aggregation of the traffic in regional networks. The traffic is routed over an already established IP topology. To request for lightpaths three algorithms are proposed: Same capacity (samec): assigns the required capacity with the same granularity for all transport connections (40Gbps or 100Gbps). Max capacity (maxc): maximizes the lightpaths utilization in terms of capacity. If there are two traffic rates that maximize the lightpath utilization, this technique uses the highest bitrate to minimize the number of requested lambdas. Min lambdas (minl): minimizes the total number of connections in order to obtain a transport demand as lower as possible. As an example, for a 130 Gbps (assuming 10G, 40G and 100G interfaces): SameC algorithm uses 4 lightpaths of 40Gbps or 2 lightpaths of 100Gbps MaxC assigns 1 lambda of 100Gbps and 3 lambdas of 10Gbps MinL reserves one lambda of 100Gbps and one of 40Gbps. 11

13 04 Results 12

14 Cost relation As the cost of an integrated card is uncertain a sweep is done to check the impact of this evolution. CR=1 is assumed when two SR interfaces and a WDM transponder in the separate node to the cost of an IP/MPLS card in the integrated model. Let us remark that this starting point is a lower cost threshold, because we are considering that integration would lead from the cost of an IP/MPLS card, In order to find a less optimistic scenario, a cost relation of 1.15 and 1.3 (i.e. a cost increment of 15% and 30%, respectively, with respect to CR=1) for the integrated cards are assumed. 13

15 Relative network cost Figure shows CapEx investment in the core transport network for the two node models (relative units). The separate node (dashed lines) is more expensive than the integrated node (solid lines). The algorithm that achieves the lowest investment in network elements is the samec 40-Gbit/s algorithm. The reason is that the price per Gbit/s is cheaper in the 40-Gbit/s technology than in the 100-Gbit/s or 400-Gbit/s technology. The cost of the network with minl and maxc algorithms lie within the envelope of the samec 40-Gbit/s and 400-Gbit/s curves. 14

16 CAPEX savings Algorithms which achieve the greatest savings are samec 100-Gbit/s and samec 40- Gbit/s algorithms. However, samec 100-Gbit/s is more expensive than samec 40-Gbit/s CapEx savings [%] Cost relation = Traffic [Tbps] CapEx savings [%] Cost relation = Traffic [Tbps] 30 Cost relation = 1.3 CapEx savings [%] samec 40G samec 100G samec 400G maxc minl Traffic [Tbps] 15

17 Incremental cost analysis The samec 40-Gbit/s algorithm is used since it achieves the best results. The proposed integration could lead to cost savings around 40% for CR=1 and 35% for CR=1.3 for a traffic matrix of 16.2 Tbps (i.e. year 7 in our analysis). SEP. SEP. SEP. SEP. SEP. INT. SEP. INT. SEP. INT. INT. INT. SEP. INT. SEP. INT. SEP. INT. INT. INT. 16

18 05 Conclusions 17

19 Conclusions The integration of colored transponders in the IP cards could lead to CapEx reduction up to 40% if such integrated transponders have a similar price (or, at most, a 30% increase) than separated components. This study does not consider other cost related to the integration, such as organizational changes or multi-layer control plane coordination which are mandatory for this evolution. Finally, let us remark that these integrated transponders must be interoperable at the optical domain in multi-vendor scenario to motivate its deployment. 18

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