Not all access lines (the line supporting your premises to the nbn) can support all speeds tiers.
The fastest speed tier available for Fixed Wireless access line connections is nbn50.
nbn100 is available for only a limited number of FTTB and FTTN connections.
It is not possible to confirm the maximum access line speed for any FTTB or FTTN connection until after the service has been installed. Once a service has been installed and activated, the maximum access line speed will be tested. If your line will not support your chosen speed tier, Exetel will inform you and offer to move you to a lower speed tier and refund any extra money you have paid for the higher speed tier.
Note that a speed tier speed represents only the theoretical maximum speed of the access line connecting your premises to the nbn. The actual data transfer speeds that you experience, particularly during busy periods, may be limited by demand in other parts of the network and will typically be much slower. For more information about nbn speeds and factors that affect them, see about nbn speeds