Broadband Technology

We use two types of technology to deliver broadband - GPON for fibre-based services and DSL for copper-based services.

Broadband over Fibre


Gigabit Passive Optical Network (GPON) technology is the global technology of choice for delivering super-fast broadband to endusers over optical fibre networks. GPON will be used in our UFB rollout.

GPON is a point to multipoint, fibre to the premises network architecture, with a single fibre-optic cable able to provide service to multiple premises. A passive optical splitter divides the signal from the exchange, normally between 32 and 64 individual houses and businesses. The fibre-optic cable coming in from the street connects to a modem at the premises, which converts optical signals back into Ethernet.

GPON technology can be used to provide both voice and broadband services. Bandwidth available allows many different media-rich services to be delivered at the same time with reliable service quality, over one fibre optic cable into the premises.

With the data being transmitted using digital pulses of light, performance is largely unaffected by distance. A home that is 30km from the exchange will get exactly the same speed as one located next door to the exchange.

Visit our mapping tool to find out when fibre is coming to your street . If you are building a new house or renovating an older property there are wiring standards that will maximise your experience on our new fibre network.

If we have completed rolling out fibre to your street you need to contact your telecommunications service provider and order a fibre based service. We then come to your house and connect you to the new fibre network. Check out the list of service providers offering UFB-based services.

Broadband over Copper

Digital Subscriber Line (DSL) technology delivers broadband over copper lines at higher frequencies than voice. This lets you use the phone at the same time as you are accessing the internet.

The DSL you receive is dependent on how far you are from your exchange or cabinet as the signal degrades over distance due to the resistance inherent in copper lines. This is known as attenuation.


Asymmetric Digital Subscriber Line (ADSL) is a communications technology that enables faster data transmission over copper telephone lines than a conventional analogue modem. ADSL uses frequencies higher than normal hearing can detect. The ADSL deployed by Chorus utilises the 25.8kHz to 1.1 MHz band.

ADSL1 is capable of delivering broadband with speeds of around 2 mpbs over a distance of around 6 km. One of the limitations of a copper-based broadband service is that the signal degrades over distance due to resistance in the copper line.

Our mapping tool provides you with information on ADSL availability at your address.  You contact your Internet Service Provider for further information on the broadband service available at your address. They undertake a pre-qualification to confirm what services are available. You can then make a choice based on what you use the internet for what plan suits you.


Asymmetric Digital Subscriber (ADSL2+) is a variant of DSL technology which increases the downstream spectrum upper limit to 2.2MHz and can deliver higher downstream rates over short distances (≈ 2km).

Our fibre-to-the-cabinet programme, completed in December 2011, saw us rollout ADSL2+ and VDSL2 technology to 3,600 cabinets around New Zealand over an additional 2,500 km of fibre. This delivered super-fast broadband, with speeds of 10 mbps or more, to 84% of New Zealanders. The Rural Broadband Initiative is a continuation of the fibre-to-the-cabinet programme, taking it deeper into rural areas.

Actual speed will be impacted by a variety of factors, including line length, cable size, service type, and house wiring.

To check ADSL2+ availability at a specific address, use our mapping tool.  Home and business users should contact their Internet Service Provider (the company that sends their monthly broadband bill) for further information.

Chorus VDSL

Very High-Speed Digital Subscriber Line 2 (VDSL2) is the third generation of DSL access technology, designed to support the wide deployment of triple play services such as voice, video, data, high definition television (HDTV) and interactive gaming.

VDSL2 was rolled out at the same stage as the ADSL2+ programme. VDSL2 can deliver download speeds in excess of 20 mbps. To deliver VDSL2, a NVLT-C card is installed at the DSLAM in an exchange or cabinet. This is capable of supporting ADSL1, ADSL2, ADSL2+ and VDSL2 services.

VDSL2 can run from the local telephone exchange or cabinet but only over short distances. It allows customers who are on a significantly faster broadband experience than ADSL2+.

To check if your house is close enough to your exchange or cabinet to benefit from Chorus VDSL use our mapping tool

It is highly recommended that the premise wiring is upgraded and the installation of a VDSL2-compatible splitter is a good quality VDSL2 service. A VDSL2 capable modem is required.

As with ADSL2+, download and upload speeds may be limited by a number of factors:

  • the condition of the copper line
  • copper loop length
  • type of cable containing the cooper loop
  • the presence of other services in a cable sheath containing the copper loop - these may cause interference to VDSL2
  • presence and degree of external interference
  • the modem performance
  • condition of the wiring within the end user's premises. It is recommended that screened Cat.5e STP cable is used between the VDSL2 compatible splitter and the modem

If you are interested in a VDSL2-based service contact your telecommunications service provider.

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