Singtel Optus will offer compensation to more than 8700 customers after offering maximum speeds on national broadband network plans that could not be delivered.

By promoting and offering these speeds that were unable to be provided, the company admitted it had likely contravened Australian Consumer Law.

The Optus NBN plans, offered from 1 September 2015 to 30 June 2017 marketed a range of speed plans, including a Boost Max with maximum download speeds of up to 100 megabits per second, and maximum upload speeds of up to 40 megabits per second, or 100/40 plans.

Due to technical limitations on fibre to the node and fibre to the building NBN connections, customers were unable to get the advertised speeds.