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SMF or MMF for connecting two SANs?

We are connecting two SANs (2 GB) 500 meters away from each other through a fibre switch McData using LC GBICs (gigabit interface converter). Do you advise using single mode Fibre cable or multi-mode cable between two buildings? What spec of cable is required?
At 2 gigabytes per second (GBps) and 4 GBps, 500 meters would be at the limit using 50/125 µm multi-mode fiber (MMF), and 300 meters on 62.5/125 µm MMF. Given the option, I would go with 9 micron single mode fiber (SMF) optic cable.

Dig Deeper on SAN technology and arrays

10 gigabit Ethernet offers opportunities for VARs and integrators The current economic climate has limited customer spending to projects that demonstrate measureable savings. 10 GbE makes possible reducing the number of ports and switches required, thereby simplifying the task of combining multiple small data centers into large data centers. Building effective consolidated data centers requires a careful analysis of requirements and a detailed understanding of network interface, switch and cabling technology. Working with customers as they plan and implement a combined data center provides multiple opportunities for VARs and integrators to provide services and sell equipment. This guide provides an overview of the issues involved in selecting equipment and upgrading customer network infrastructure to support the use of 10 GbE in a consolidated data center.

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