Network Termination Device (NBN)

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A Network Termination Device (NTD) is a customer-side network interface device used by the Australian National Broadband Network, with different NTDs for FTTP, fixed wireless and Sky Muster satellite. The device provides multiple bridges to the NBN. Depending on the kind of link, up to two telephony and four data services can be purchased from an NBN Retail Service Provider (RSP). With FTTC the NTD is called a 'connection box.[1]

Technicians sometimes refer to NTDs for fixed wireless as IDU (Indoor Unit) in contrast with the antenna, which is called an Outdoor Unit (ODU). The User Guide for NBN Fixed Wireless Connection refers to the devices as the NBN Connection Box and NBN Outdoor Antenna, respectively.

All but FTTN and FTTC use a NTD on premises. An external power source is required to power the NTD. A uninterruptible power supply (UPS) can be used to power the NTD to maintain connection to the telecommunications network in case of an electrical power outage, with a backup battery available for the FTTP NTD,

All technologies except Fibre To The Node (FTTN) and Fibre to the Curb (FTTC, previously called Fibre to the distribution point (FTTdp)) provide User Network Interface (UNI) jacks (modular jacks for data (UNI-D, RJ45)) in premises. FTTN and FTTC each require premises to have a compatible VDSL2 modem. FTTC requires power to be provided from the premises to the curb (distribution point).

Each UNI-D port can be activated by the retail service provider for a different NBN service. The NTD cannot be used as a router for in premises networking. If only one data connection is required it can be achieved through the active NTD UNI-D jack.


UNI-D: User Network Interface-Data
UNI-V: User Network Interface-Voice

Network Termination Device (NTD)
Technology NTD Supplier Protocol UNI-V jacks UNI-D jacks legacy telephony Voice over IP Notes
FTTP NBN Co 2 4 yes yes
FTTN No, end user modem VDSL2+ 0 1 no yes may have 600 series plug in place instead of UNI-V
FTTC NBN Co VDSL2+ or 1 1 no yes

previously FTTdp
Netcomm Wireless NDD-0300 Rev: 02[2]
Power supplied from end user premises to Distribution Point Unit at kerb. Input 200-250 50/60 Hz/460mA Output DC 60V/350mA

HFC NBN Co 0 1 no yes
Fixed wireless NBN Co 0 4 no yes where a plain old telephone service is in place, this can be kept
Satellite NBN Co 0 4 no yes where a plain old telephone service is in place, this can be kept