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How many fiber optical cables i need

hi, in order to connect a main office to a branch next door about 400 meters, the branch office has 150 staff, and both ends have Cisco switches.

How many fiber cable I need? and what type of cable?  and for redundancy, should I include another one as backup?


thanks
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tonitoni99
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tonitoni99
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gt2847cCommented:
How much data are you sending back and forth between the two offices?  How critical is the connectivity - how long can you be down, how much redundancy do you need/want/willing to pay for?

In most cases, a single fiber pair will carry sufficient traffic.  OM3 multi-mode fiber can carry 1G Ethernet for 550m which would probably get you end to end (remember you have to get in and out of the building in addition to just the straight line between them, so that will take up some additional distance).  You could also get single-mode fiber (more expensive for both the GBIC and the fiber), but that can go significantly further.

If your connection is critical, two separate drops using separate paths between buildings would give you the ability to withstand a single fiber cut, but is more expensive since it would require more work to create redundant paths between the facilities.  Unless existing tunnels, or conduit already exists, the fiber is less likely to be most expensive component in this work.  The trenching and permits will probably cost a good bit more.

There are other possibilities to consider if laying fiber between buildings is too expensive.  There is optical and wireless link technology that would carry between those facilities (if line of sight exists) and can carry a multi-Mb up to Gb throughput.
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rauenpcCommented:
Good advice above. Make sure the fiber is either single mode or 50 micron. 62.5 micron is the cheapest, but the least capable. I work at a cabling company and we are constantly replacing older 62.5 micron MM fiber within a couple years of installation because it doesn't keep up with network needs, and our customers can only kick themselves for going cheap the first time around. It would probably be a great idea to run two types of fiber. 12 to 24 pairs of 50 micron and 6 to 12 pairs of single mode will give you many options for years to come.
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Sandeep GuptaConsultantCommented:
use SM fiber and try to built fiber redundency in between s/w
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