When we buy new device such as ZyXEL Communications IES-1248-51V we often through away most of the documentation but the warranty.
Very often issues with ZyXEL Communications IES-1248-51V 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 ZyXEL Communications IES-1248-51V 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.