The Network Boundary Point is where the legal responsibility of the RSP finishes. From this point into the premises, the lines are privately owned and therefore all maintenance is the responsibility of the property owner. Depending on the access technology available in your premise (see FAQ: what is the multi-technology mix), the Network Boundary Point sits accordingly:

Type of
UNI
Port
 
Network Boundary Point Number of available
ports on NBN Devices
Access Technologies Type of
Premises
UNI-D Ethernet NTD 4 Fibre, Wireless and Satellite. All Premises
1 HFC
UNI-V Analogue NTD 2 Fibre All Premises
UNI-DSL
 
xDSL Jumper Cable termination on the Customer Side MDF N/A (there is no NTD) FTTB All Premises
FTTN Multiple Dwelling Unit
UNI-DSL
 
xDSL First Telecommunications Outlet or, if present, Passive NTD* N/A (there is no NTD) FTTN Single Dwelling Unit
UNI-D Ethernet after NCD First Telecommunications Outlet 1 on NCD FTTC Single Dwelling Unit
UNI-D Ethernet after NCD Jumper Cable termination on the Customer Side MDF 1 on NCD FTTC Multiple Dwelling Unit

Note: Where the Network Boundary Point is at a Passive NTD, NBN Co will be responsible for the installation, supply and repair of the NEBS up to, and including, the passive NTD. In those cases NBN Co will not be responsible for reconfiguring wiring beyond the Passive NTD to the Telecommunications Outlet.