When we buy new device such as D-Link DGS-3120-48PC we often through away most of the documentation but the warranty.
Very often issues with D-Link DGS-3120-48PC begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Switch D-Link DGS-3120-48PC is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Switch on our side using links below.