Comment Use LibreOffice Calc (Score 1) 165
Use LibreOffice Calc, open a cell at the top left height: half the page tall and width: about 6 inches. Then use the drawing features of Calc and just put boxes, connectors, labels, etc. in your drawing. I usually then put written information below the drawing cell that describes special details network details, issues, and special notes about wiring. By having the entire page saved as an .ods document, you'll be able to open it easily. (I have over 150 such pages for clients in my business.)