A mortgage bond is a corporate debt instrument that's supported by real estate property collateral. Bondholders have a claim on the collateral property if the corporate borrower defaults.
A 30-year fixed mortgage is a mortgage loan that keeps the same rate of interest throughout the loan's 30-year life. In most cases, fixed-rate mortgages are fully amortizing, so that the debt will be paid off at the end of the 30-year term.