When we buy new device such as ZyXEL Communications P-660R we often through away most of the documentation but the warranty.
Very often issues with ZyXEL Communications P-660R 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 Network Router ZyXEL Communications P-660R is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Network Router on our side using links below.