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10G Ethernet DWDM Interconnections in Enterprise Campus Networks
Since the IEEE 802.3ae standard was ratified in 2002, the number of 10 Gigabit Ethernet deployments has grown rapidly. The 10 Gigabit Ethernet market has grown from US$385 million in 2004 to $885 million in 2005 and has a potential of $3.4 billion in 2009, according to the Dell’Oro Group.
The current trend in the networking industry is consolidation. Even without specific applications requiring 10Gbps, bandwidth needs within the campus network have grown quickly because of network consolidation feeding the demand for higher bandwidth. Today 10 Gigabit Ethernet is deployed through the campus core, the campus distribution, and also the campus access network, to achieve a reasonable oversubscription ratio, if deploying Gigabit Ethernet to the desktop or to servers. (See Figure 1.)
Figure 1 10 Gigabit Ethernet Campus Design
To scale the core bandwidth beyond 10 Gigabit Ethernet, a new IEEE standard is needed. But standardization has not been started yet and is not expected to be ratified within in the next four years. The standard Ethernet service 802.3ad link aggregation can be used to aggregate up to eight 10 Gigabit Ethernet links into a virtual 80Gbps connection. DWDM can be used to transport various channels over an optical infrastructure.
DWDM is an optical technique to transmit multiple channels on the same fiber strand. Using the standard ITU 100 GHz grid in the C-band with the 4-skip-1 channel plan, 32 different channels can be transported over the same fiber, resulting in a fiber transmission capacity of up to 320 Gbps.
The goal with convergence is to build network architectures that are simpler to operate with enhanced flexibility to deliver new services with reduced capital expenditures (CapEx) and operating expenses (OpEx). In order to address the CapEx and OpEx aspects, the trend in DWDM network architecture is to drive cost elements out of the photonic layer and into the IP routers and Ethernet switches and to achieve network convergence on the photonic layer.
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