Openreach FTTP ONT: Difference between revisions

[[Category:FTTP Faults]]

[[Category:Routers]]

[[File:Openreach_ZyXEL_ONT.jpg|thumb|2.5G Openreach (ZyXEL) ONT from 2026 - LOS light is red, showing a fault on the fibre path]]

[[File:Fttp-ont-pon.jpg|thumb|(Newer) Openreach single port ONT - Lights show all good]]

[[File:Older_ONT.png|thumb|(Older) Openreach ONT - Lights show all good]]

[[File:Ont-ports.png|thumb|(Newer) Openreach single port ONT ports]]

[[File:ONT-side.jpg|thumb|(Older) Openreach ONT, powered off!]]

[[File:Nte-ok.jpg|thumb|(Older) Openreach ONT, powered on and working OK]]

[[File:ONT-opened.jpg|thumb|(Older) Openreach ONT, cover removed. Customer router connects to yellow socket]]

This page is about the FTTP termination device that Openreach install for FTTP customers. ONT stands for Optical Network Terminal, sometimes (mistakenly) called an openreach modem. CityFibre use a different ONT - we have a separate page on that: [[CityFibre ONT]]

=Summary:=

* In short, the ONT in installed inside the customer's premises by Openreach and converts the fibre connection from the outside world in to a RJ45 port which you plug in to your router with a CAT5 cable.

* The ONT requires power, and a UPS is recommended, see our [[VoIP_Power]] page for suggestions.

* Openreach have a [https://www.openreach.co.uk/cpportal/content/dam/cpportal/public/images-and-documents/home/help-and-support/sins/documents/Optical_Network_Terminals_ONTs_v1_1.pdf specification document].

Openreach provide an ONT for use with FTTP services. - so when you order a BT-based FTTP service from A&A, an Openreach engineer will install the little ONT unit in your premises. You then connect your Ethernet router to it and set your router with the A&A PPP credentials to log in.

This page is about diagnosing problems with the Openreach ONT.

* A working Openreach unit has '''green: power, PON & LAN''' lights, anything else indicates a problem.

* Your PPPoE capable router will plug in to the LAN port and connect you to the internet.

=More info=

* Newer ONT installs do not include a Battery Backup Unit (BBU) See: [[999_and_faults]]

* Where provided, the battery has a short warranty, and should be maintained by the end user, however, the battery is to keep the unit powered so that the TEL ports can be used during a power outage - we don't use the TEL ports, so you will want to make other arrangements for using a phone during a power outage - eg a mobile phone. See: [[999_and_faults]]

* At least newly installed BT ONTs support Baby Jumbo frames (see [[MTU]])

* Openreach have a [https://www.openreach.co.uk/cpportal/content/dam/cpportal/public/images-and-documents/home/help-and-support/sins/documents/Optical_Network_Terminals_ONTs_v1_1.pdf specification document].

== Openreach ONT LED Status ==

| rowspan=2 | '''PORT1''' or '''LAN''' || Blinking/Flashing green || Data being transmitted || '''Good'''

=Outdoor Junction box=

[[File:CF-BT-Outside-spice-boxes.jpg|thumb|alt=CityFibre and Openreach outdoor Junction box|Outdoor Junction Box]]

Openreach will usually install a junction box on the outside of the property. This connects up the fibre from the street to the fibre that goes inside the property.

This is a passive device, doesn't require power, and is just used to connect the two fibres together. The photo shows both a Brown CityFibre unit and a Grey Openreach unit.

= Download Committed Rate =

BT's FTTP service is a domestic-grade service and the technology uses a shared path - multiple premises will use the same fibres within the network and so there is contention. Usually this does not lead to congestion - if it does then we'll take that on as a fault. BT Wholesale to specify the ''Minimum ‘Best Efforts’ Downstream Throughput'' for services as is shown below, this said, BT also state that in reality services typically operate closer to the purchased speed for the majority of the day.

{| class="wikitable"

|-

! Service

! Minimum ‘Best Efforts’ Downstream Throughput (Mb/s)

|-

! 115/20

| 60

|-

! 160/30

| 95

|-

! 330/50

| 165

|-

! 550/75

| 195

|-

! 1000/115

| 195

|}