Dated G-Secs and State Development Loans: half-yearly coupons, 5 to 40 years, registry at RBI's Public Debt Office
Background
The RBI primer says a Government Security is a tradeable instrument issued by the Central Government or the State Governments, acknowledging the Government's debt obligation. The Central Government issues both treasury bills and bonds or dated securities, while the State Governments issue only bonds or dated securities, called State Development Loans (SDLs). Dated G-Secs carry a fixed or floating coupon paid on the face value on a half-yearly basis, and their tenor generally ranges from 5 years to 40 years. The Public Debt Office (PDO) of the Reserve Bank of India acts as the registry and depository of G-Secs.
In plain words
SDL State Development Loan — The bonds or dated securities issued by State Governments.
PDO Public Debt Office — The office of the RBI that acts as registry and depository of G-Secs.