SWDM: THE LOWEST TOTAL COST SOLUTION FOR 40G/스피드 바카라 사이트 IN THE ENTERPRISE DATA CENTER

Large- and medium-sized enterprises have been widely deploying 10G Ethernet for several years. Their 스피드 바카라 사이트 center infrastructure has been primarily architected around duplex OM3 and OM4 multimode fiber (MMF), since most of the switch port interfaces are multimode 10GBASE-SR using the SFP+ transceiver form factor. Consequently, IT staff (both in-house and outsourced) responsible for the installation and operation of 스피드 바카라 사이트 centers are very familiar and comfortable with using duplex patch cords with its associated LC connector in the rack. The LC connector is the most successful optical connector in the market so far, with its characteristic “clicking” sound to confirm proper latching, as well as its simple termination and cleaning.

As these data centers begin their transition to 40G and 스피드 바카라 사이트 Ethernet, enterprise IT architects had a choice to make until now:

1. They could use 40GBASE-SR4 and 스피드 바카라 사이트BASE-SR4Datacom 에볼루션 바카라 사이트novation 에볼루션which have become very cost-effective but which require the use of parallel optics infrastructure. This means having to replace their duplex LC patch cords with parallel MPO patch cords, as well as installing additional trunks/structured cabling (since each full-duplex link now would require eight fibers instead of only two). This approach is not only CapEx-intensive, but also may increase OpEx substantially given the unfamiliarity of the IT networking personnel with the handling/cleaning of the MPO connector. Depending on the data center size, an additional disadvantage is that these IEEE interfaces support a shorter reach (100/150m for 40G, and 70/100m for 스피드 바카라 사이트 on OM3/OM4 MMF) than the currently deployed 10GBASE-SR (300/400m on OM3/OM4 MMF).
   
2. The other option was to install single-mode fiber to continue to use the familiar duplex fiber/LC-connector paradigm. This means using 40GBASE-LR4 and 스피드 바카라 사이트BASE-LR4 (or CWDM4) optical transceivers, which have a significantly higher cost than multimode SR4 transceivers. This is a very CapEx- and OpEx-intensive approach, with the advantages of eliminating cost in IT personnel re-training to use the MPO connector, as well as substantially increasing the link distance (if that were a requirement). It could be argued that a potential additional advantage of this single-mode option is the future-proofing of the infrastructure for deployments beyond 스피드 바카라 사이트 Ethernet. However, the IEEE is already standardizing multimode 400G interfaces suitable for the enterprise data center environment, which are expected to be available by the time most of that market segment is ready for the transition.

Leveraging Existing Fiber Infrastructure for 스피드 바카라 사이트 Center Upgrades

Neither of the options above is particularly attractive. Ideally, enterprises would like to upgrade their data centers to 40G/스피드 바카라 사이트 Ethernetwithout changing their existing duplex multimode fiber infrastructure being used for 10G Ethernet.

스피드 바카라 사이트so, many would like to maintain the same supported link distances as 10G Ethernet.

Pluggable optic스피드 바카라 사이트 transceivers withShortwave Wavelength Divis스피드 바카라 사이트 Multiplexing(“스피드 바카라 사이트”) technology address this market need. The approach consists of multipleVCSELsoperating at different wavelengths in the 850nm window (where multimode fiber is optimized). The four-wavelength implementation of SWDM is called SWDM4, and these four wavelengths are multiplexed/demultiplexed inside the QSFP transceiver into a pair of multimode fibers (one fiber in each direction, i.e., a standard duplex interface). Each of the four wavelengths operates at either 10G or 25G, enabling the transmission of 40G (4x10G) or 스피드 바카라 사이트 (4x25G) Ethernet over existing duplex multimode fiber, using standard LC connectors. Note that this is a similar approach to what is done in LR4 and CWDM4, but optimized for multimode fiber. The block diagram of a 스피드 바카라 사이트 SWDM4.