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BT Openreach Thank An Engineer


BT Openreach Fibre Availability Checker


BT Openreach Line Tester

Dial 17070 and follow instructions.

Some test features will only be available on lines directly rented from British Telecom or its subsidiaries.

For instance TalkTalk users will not have access to the tests.

BT Openreach How To Guides


Test Files

Downloadable test files in different sizes to confirm download speeds:


Test My

Various tests available:


Telephone Exchange Finder

MTU Testing

This is for tweaking the Ubiquiti Edge Router X (ER-X) and TCP Clamping and MSS.

Plus Net MTU = 1500


Thanks - https://community.ubnt.com/t5/EdgeMAX/BT-infinity-fibre-optic-setup/m-p/1183648/highlight/true#M57491

Speed Testing

In The Browser

BT Wholesale Speed Test

Plus Net Transfer Speed Test

There are many web based speed test but this is the one we most commonly use:



From The Command Line

sudo aptitude install -y -v speedtest-cli


sudo speedtest-cli


Retrieving speedtest.net configuration...
Retrieving speedtest.net server list...
Testing from PlusNet Technologies Ltd (xxx.xxx.xxx.xxx)...
Selecting best server based on latency...
Hosted by Seacom Ltd (London) [0.89 km]: 29.967 ms
Testing download speed........................................
Download: 13.92 Mbits/s
Testing upload speed..................................................
Upload: 0.81 Mbits/s


usage: speedtest-cli [-h] [--bytes] [--share] [--simple] [--list]
                    [--server SERVER] [--mini MINI] [--source SOURCE]

Command line interface for testing internet bandwidth using speedtest.net.

optional arguments:
 -h, --help       show this help message and exit
 --bytes          Display values in bytes instead of bits. Does not affect
                  the image generated by --share
 --share          Generate and provide a URL to the speedtest.net share
                  results image
 --simple         Suppress verbose output, only show basic information
 --list           Display a list of speedtest.net servers sorted by distance
 --server SERVER  Specify a server ID to test against
 --mini MINI      URL of the Speedtest Mini server
 --source SOURCE  Source IP address to bind to
 --version        Show the version number and exit

vDSL Socket

Openreach's Mk3 SSFP (Service Specific Face Plate) (vDSL) plate has a common-mode filter that is compatible with vDSL. It is an interstitial plate and has the modem socket located at the top with a filtered phone socket at the bottom. Extension wiring connected to the lower front plate doesn't need additional filters. There is also provision on the Mk3 plate for connecting extension wiring that can be used for a modem socket, the proviso being the cable meets the correct standard CW1308, there should be no performance degradation. If CW1308 cable is unavailable Cat5 cable is also usable as they are essentially the same product the former only having two pairs while the later has four pairs.

BT NTE5 MK3 Complete

The picture shows the unit as it would look attached to your wall (minus the screws).

BT NTE5 MK3 Broken Down

Here the box is broken down in to its component parts (excluding the back box), top left is the master socket, top right is the vDSL filter plate and lastly at the bottom is the telephone face plate.

BT NTE5 MK3 Extension Connection

This picture shows the vDSL filter plate flipped over, in the top left hand of the unit there are two punch down terminals that can be used to extend the vDSL to another socket.