Convertible debt issuance rules require credit rating, trustee appointment and prescribed asset security before public offer. Issuance of convertible debt instruments requires an issuer to obtain a credit rating, appoint at least one debenture trustee, and create a debenture redemption reserve under company law; secured issues must have sufficient, unencumbered assets, obtain prior consent for second or pari passu charges where prior security exists or leasehold land is involved, and calculate security cover after reducing liabilities with prior charges; redemption must follow the offer document terms.