National Replacement

National Replacement is a service offered by Eos on Eos 1. It provides an emergency broadcasting service when Network SIX is unable to fulfill its duties due to natural disasters, technical failures and terrorist attacks. The service was originally offered by fourtsnsat on their Astra transponders, and later on fourtsnsat1 before the company was merged into Eos.

National Replacement is broadcast off transponders F5B and F5C. It provides enough capacity for emergency and service information (including testing), three Network SIX feeds, two digital channels and two HD channels. The service has been scaled back from its original design however in a full-scale emergency unused transponder space can be used for National Replacement to add many more channels.

Due to the design of the system as well as network rules, the satellite can only be used at a certain time. Eos has a system set up so any Network Six franchisee or Network Control can self-authorize themselves in an emergency. It can be used in any case, from natural disaster / terrorist attacks to system failures.