The bond issue is due in 2020.
The transaction will be coordinated by JPMorgan, Erste Group, SocGen and UniCredit Bank.
RCS&RDS representatives declined to comment on the matter.
In May, RCS&RDS shareholders approved a plan to contract financing of up to EUR800 million to restructure debts totally or partially.
According to Trade Registry data, Cable Communications Systems owns 88.54% of RCS&RDS, and a 7.83% stake is controlled by the company itself.
Cable Communications Systems is controlled by RCS Management, which is 60% owned by businessman Zoltan Teszari.
In 2011, RCS&RDS signed two financing agreements, a forward start syndicated loan of $206 million and a syndicated loan worth EUR125 million.
RCS&RDS is present in Romania, Hungary, the Czech Republic, Slovakia, Serbia, Spain and Italy.