So, how can you extend your Ethernet network up to 1600ft (about half a mile) without a glitch? To effectively extend your network range over 100 meters, you'll need a long-range Ethernet switch. Proper sizing and layout are critical for functionality, maintenance, and scalability. ft), then Size: 3m (10 ft) x 2. 4m (8 ft). The “straight line” distance between the point of entry of the cable (very close to the existing point of entry for the copper wire) and my preferred ONT location is approx 2metres, although the cable route will require approx 8 metres of cable (skirting board run and doorway). Is. In the design of any network—whether a home Wi-Fi setup, an office backbone, or a global telecom infrastructure—the maximum length of network cables is a make-or-break factor. Learn how to extend Ethernet past that limit. Whether you're trying to share Internet access between buildings or connect cameras across a field, it's easy to run up against the distance limits of a typical Ethernet cable. When I used premade calbes I created a spreadsheet to calculate the vertical length of the run by subtracting the differences in elevation (in U's) and multiplying by 1. I then added 3' for the combined horizontal distance and rounded up to the next standard length (3', 5', 7', 10' etc.