It typically consists of 4 pairs of 2 wires (8 separate wires total), all within one casing. The standard connector in computer networking is an RJ45. To connect your fiber optic cable to a router, ensure you have the following: Fiber optic modem (ONT): Most fiber connections require an Optical Network Terminal (ONT), provided by your ISP. This. The number of optical cores in an optical fiber is the total number of equipment interfaces multiplied by 2, plus 10% to 20% of the spare quantity, and if the communication mode of the equipment has serial communication and equipment multiplexing, you can reduce the number of cores. Running copper Ethernet cables and coax cables outdoors can put your entire home or office network at risk for power surges from lightning strikes.