Grid Job Routing Algorithms - Phosphorus

Grid Job Routing AlgorithmsFigure 6.4 :PHOSPHORUS testbed performance under ASE noise impairment for various loads. FEC is used.CD studiesIn our experiments, all network fibers are characterized by the same D CD value. B is considered constant andequal to 10 Gbps. We executed a great amount of RWA simulations for D CD values ranged at 5−20 ps/(nm·km)(small values correspond to newer fibers, while big values correspond to older ones) and traffic loads of 10, 20,30 and 40 percent of the number of the total possible connections. Both cases of LPF and NRZ modulationformat used were considered. In our experiments, we assumed that on each network node there was a DCMthat compensated 95% of the CD introduced by the previous fiber link.In cases where DCM is not used a blocking probability close to 100% is obtained. It is experimentally shownthat for B=10Gbps and D CD = 17 ps/(nm·km), the threshold of 2 dB appears at about 50km if NRZ modulationformat is used and at about 140km if LPF modulation format is used. However, since the links of the networkunder consideration are long, CD impairment would block almost all connections. For that reason, current daynetworks of speeds up to 40 Gbps require compensation techniques to be utilized, an assumption that weconsequently also made in our simulation experiments.Project:PHOSPHORUSDeliverable Number: D.5.3Date of Issue: 31/06/07EC Contract No.: 034115Document Code: Phosphorus-WP5-D5.360