Advertisement Feature: Nokia Siemens Networks
Flexible factors
for DWDM rollouts
Although it seems like yesterday, large network operators now using 40G ence to also support metro networks
the days of vast and redundant DWDM technology from Nokia Siemens with a cost effective, modular approach
overcapacity in the world’s long haul Networks are AT&T and Verizon, says that allows you to scale up from metro
networks have been gone for some Fischer, who adds: ‘”By 2010/11 we will to 40G and ultimately to 100G.”
time. The exponential rise of digital see 100G rolled out over DWDM – that’s
traffic – such as the videos posted equivalent to two DVDs a second, but A single platform also lowers costs
by the YouTube generation – has there is considerable complexity in by using a common spares pool for
reversed the situation. And while handling optical signals at these speeds. metro/core networks, and engineers
much attention is on how service The critical components are the high and managers need training only on
providers and governments respond speed electrical and optical modules to one system. It also saves on space
to the challenges of upgrading the handle framing and post-processing.” and power with one rack mount
‘last mile’ of telecoms networks, there system handling both networks,
is now just as much pressure on and both DWDM and CWDM
how to carry all the extra IP traffic standards can be supported either
at both metro and core level. separately or on the same fiber.
As Uwe Fischer, head of the DWDM “We also offer support for a very broad
business line at Nokia Siemens spectrum of ROADMs [reconfigurable
Networks, comments, a vivid example optical add-drop multiplexers], which
of the rise in traffic on core networks switch wavelengths at the optical level.
can be seen graphically on the website
Uwe Fischer: Head of DWDM business line
ROADMs vary greatly in configurability,
of the Amsterdam Internet Exchange. Nokia Siemens Networks performance and therefore price – and it
“A year ago average traffic through the is important to support the entire range
exchange was about 220Gbits/s, with But implementing DWDM technology for both cost-sensitive metro applica-
peaks up to 280G or so,” he says. “Now also requires attention to the many tions and the needs of a high perform-
the average has gone through the practical issues involved in deploying ance core.” At metro level, he adds, you
300G mark and peaks are reaching high-speed metro and core networks. also have to support multiple services
nearly 500G at certain times of the “The experience we have gained though, such as SDH/SONET, Ethernet, storage
day. We are seeing traffic at least for example, being the first to market area networks and so on. “We have
doubling every two years and there are with 40G interfaces for Cisco’s routers, the same software configurable trans-
various ‘hotspots’ facing especially high and providing the technology for AT&T’s ponder for all client services,” he adds.
demands. The question for communica- backbone in the US, shows that you
tions service providers is how they can also need to cope with issues such as Transponders, notes Fischer, are at the
most cost effectively support traffic variable fiber quality by simplifying and center of the drive for cost efficiency,
growth at both core and metro level.” automating its management as far as as they account for 50–70% of capital
possible – and we have a high level expenditure. “Ultimately, flexibility is the
Low cost of ownership and flexibility of such automation in our systems.” most important factor in DWDM. As
are crucial for network investments that an operator you want to control your
will carry economically the unlimited, There is also a strong case for moving CAPEX with a solution where you can
flat rate bandwidth that consumers and to 40G capability for those opera- start small at low cost and grow your
enterprises are becoming accustomed tors with 10G networks – otherwise channels and add transponders on
to. Ideally, the best solution lies in a when they need to scale up quickly demand, and so scale up to a high-
single optical platform that spans metro they could be faced with prohibitively performance system. Meanwhile, OPEX
and core networks, able to rapidly scale expensive overlay networks that use savings come from automating the
up to support new and existing client more fiber. “It is about total cost of installation, upgrades and management
services – SDH/SONET, Ethernet, ownership – you can take out four times of your network as much as possible.
storage area networks and more. 10G, replace it with 40G and still use
your 80 channel system,” says Fischer. “Service providers cannot be sure
There is no question, says Fischer, that what the future will bring – we do not
underlying fiber technology is not up to He adds: “We have also addressed know what economic conditions will
the task. The capacity of the present the divide that has existed between look like in say two years time. We see
generation of DWDM (dense wavelength metro and core systems by providing the hiT 7300 as the DWDM ‘Swiss
division multiplexing) deployments is one platform for both. It has been the Army knife’ as it can help operators
now up to 40Gbits/s over 80 channels case that you could have a high cost, to address all the uncertainties out
on one fiber pair. DWDM has compelling high performance core that could not there in the IP transport world.”
technical advantages such as making compete at metro level, or metro systems
best use of existing fiber, supporting that could not scale up to high perform- Find out more at
multiple data formats and rapidly ance. With the hiT 7300 DWDM platform www.nokiasiemensnetworks.com/
scaling for new services. Among the we have extended our long haul experi- transport
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