A simple rule is that each device needs two cores—one for sending and one for receiving data. However, if your equipment supports serial communication or allows device. If you have multiple Ethernet switches that need to be connected over long distances, fiber is obviously a preferred choice. Moreover, when it comes to bandwidth, no currently available technology is better than single-mode fiber. 09-28-2013 10:27 AM Ok, I understand now. So, you need 6 pairs of fiber from each floor to 3rd floor. Of course, this is a general situation, and specific words may consider according to the following criteria. Number of wiring points and switches. I am planning to connect core switch to multiple switches using 6 strand fiber cable. which type of cnnection is resilient Star or Ring??? If I make star then do i have to use new cable to each switch or strand of a cable to patch other switch??Thanks. It usually depends on the model of the switches. Here are some factors to consider: Number of devices: Each device connecting to the cable typically needs two cores (one for sending and receiving data). Cost: Higher core count cables are generally more expensive.