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An MRV Lambda Driver LD800 chassis was installed at each site. According to Figure 94, the

EM2009-GM2 module multiplex two 1 Gbps channels into one single 2.5 Gbps channel, which is

then plugged into the EM800-MUX8/CW CWDM multiplex-demultiplex module. A management

module and a pair of redundant power supplies complete the configuration of each LD800

chassis. As one of the lambdas is still available, during SC'06 we used a second lambda to

connect SPRACE to NAP of Brazil, for performing bandwidth/latency tests. More recently we

have used both lambdas for SPRACE-NAP link troubleshooting.

A third MRV chassis is planned to be installed at Impsat, as well as some extra modules at each

site. The complete USP­NAP­Impsat WDM network is planned to be as shown in Figure 95.

Figure 95: USP-NAP-Impsat WDM link upgrade planning

As can be seen in Figure 95, elements of the project already implemented are shown in blue,

whereas the remaining pieces, to be soon implemented, are highlighted in red. MRV module

TM2-SFP will act as a repeater to boost the signal between USP and Impsat and is planned to be

used by SPRACE. The use of this module prevents SPRACE channels from being de-multiplexed

and re-multiplexed at NAP of Brazil, since the main target is the Cisco ONS-15454 installed in

Cotia.

In search for the best timely and cost-effective solution for a MAN topology, ANSP engineers are

also studying two other alternatives to the project detailed above. The first one considers using

WDM equipments provided by PadTec [4], a local company which develops similar WDM

systems that can be used instead of MRV boxes, possibly at a fraction of the price. The second

alternative is still in its early development stages and is highly dependent on an agreement among

ANSP, Terremark, AMPATH and LANautilus. It consists of transferring the AMPATH access

point from Impsat data center in Cotia to NAP of Brazil in Barueri. It is worth to say that this is

not a technical issue, so we avoid diving into this discussion. However, this alternative, if

succeeded, would be undoubtedly beneficial to SPRACE, as traffic exchange between our main

servers and the ONS-15454 would travel only 40 km. This would possibly allow us to reach

Abilene in only three hops, a quite remarkable achievement.

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