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10G XENPAK
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Network Convergence on the Photonic Layer Part 1
Optoelectronics technologies over the past few years have evolved dramatically. Not only can 10 Gigabit Ethernet optics be packaged in Small Form-Factor Pluggable (SFP) transceivers such as XENPAK, X2, or XFP, but also even more sophisticated long-reach DWDM optics can now be accommodated within the size and power constraints of hot pluggable form factors such as the XENPAK modules.
These technical advances are opening up a new paradigm to build enterprise core networks using the power of DWDM.
DWDM functions used to be typically carried out in dedicated optical equipment such as transponders, capable of operating the wavelength conversion from, for example, a “traditional” 1310 nm laser to a DWDM channel with very tight control over the wavelength stability.
The Cisco Systems® DWDM XENPAK enables 10 Gigabit Ethernet over DWDM without the need of dedicated external equipment. The sophisticated DWDM function is squeezed into a XENPAK module, which is equivalent from a Layer 2 and higher perspective to any other XENPAK available on Cisco® devices.
Figure 1 IPoDWDM on Ethernet Switches
The capabilities of current hot-pluggable XENPAK transceivers allow the migration of DWDM functions directly into routers and switches, and customers can experience operational and CapEx savings by removing required costly optical equipment to perform the wavelength translation just mentioned.
10G 40km DWDM XENPAK ER Transponder Compatible Cisco
IP over DWDM (IPoDWDM) is the Cisco paradigm to design cost-effective, converged, scalable optical networks based on Cisco Catalyst® 6500 Series Switches for Ethernet equipped with DWDM pluggable optics. (See Figure 1)
Moreover, consolidating the DWDM function in an Ethernet switch also provides significant operational advantages:
● Less power and rack space is now required because of elimination of transponders.
● Fewer optics and electronics also mean fewer points of failure in the network.
● The DWDM layer can be managed by a LAN administrator without the need of specialized personnel to run the optical layer, which can very well be reduced to pure passive elements to multiplex and demultiplex the XENPAK wavelengths.
DWDM is the unifying technology that allows consolidation of data center and enterprise campus applications over a common transport infrastructure. The Cisco DWDM XENPAK pluggable modules allow enterprise companies to provide scalable and easy-to-deploy 10 Gigabit Ethernet services in their networks. The Cisco DWDM XENPAK input/output devices are hot-swappable, plug into an Ethernet XENPAK port of a Cisco switch or router, and are not wavelength-tunable. These DWDM pluggable modules are delivered with 32 different product numbers (SKUs) supporting the standard C-band ITU 100-GHz wavelength channel plan, as shown in Figure 2. The Cisco DWDM XENPAK solution allows the reach of these networks to scale up to over 200 km by means of optical amplifiers known as EDFAs and dispersion compensation units using single-mode ITU-T G.652 fibers.
We offer two different optical architectures to implement 10 Gigabit Ethernet using Xenpak DWDM pluggables:
Figure 2 ITU 100 GHz DWDM Channel Plan and 10GbE DWDM XENPAK Optical Transceiver
For more, please see the next page, which is the part 2 of this article.
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