A comprehensive definition of REIN and SHINE.


What is REIN ?


Repetitive Electrical Impulse Noise


REIN is radio interference emitted from an electrical source.

There are a number of possible causes of REIN, some are listed below:


Mains Adapter Faults

Timed devices – such as Central Heating

Christmas tree lights, especially on their “flashing” sequence. (Usually cheaper products)

EPOS – Electronic Point of Sale and PDQ (Process Data Quickly) Devices

Railway Power Lines

Electric Fences

Street lights and Roadworks.

Faulty Set-Top Boxes

Security Lights

Power cables running close to telephone wiring in the customer’s premises.


The radio interference produced by some REIN sources has been noted to have a particular pattern, such as that caused by a faulty switch mode power supply.


REIN may be continuously present at some levels, or may occur at certain times, for particular periods of time. This normally correlates with human intervention or scheduled programming. Some may be seasonal, as per the suggestions above.



BT Openreach REIN statement

Openreach will attempt to identify and locate the source of the electrical noise interference.

If it can be identified and located we will request the cooperation of the owner to take action and stop the noise.

It can be a very difficult and lengthy process to locate a noise source. If the Openreach engineer suspects they have identified the source they rely upon cooperation of the owner in turning off the suspected item to confirm this.

There is no current legislation that allows us or the telecommunications regulator (OFCOM) to take action against such faulty equipment and there are no powers compelling the owner to refrain from using the device.


What is SHINE ?


Single Hit Impulse Noise Environment


SHINE is radio interference emitted in short bursts, usually at random intervals. In some cases it is visible as periods of brief bursts of errors in the DLM data. In severe cases the interference is powerful enough to cause an immediate drop in connection and can prevent a line synching up until the interference has ceased. In these cases we do not see evidence in error data but we do see short periods of dropped connection. The cause of SHINE is the most difficult type of noise to locate because of its spurious nature.

It might be expected that when SHINE is preventing reconnection for a period that there would be a record of failed retrains but we have not observed this in investigations to date.


Please note:

Due to the random and erratic nature of SHINE, if an SFI engineer is requested where SHINE may be affecting a circuit please ensure all End User checks have been completed to reduce the risk of potential charges applying.


Customer REIN Checks



In a large percentage of cases the source of interference is often within End Users premises.


1) As a starting point you should ensure your Broadband equipment is connected correctly to the master socket or Service Specific Face Plate (SSFP) if fitted and ensure that the correct filter(s) are installed.

Internal wiring can act as an antenna to interference so identifying poor or faulty internal wiring will do a lot to minimise the effects of REIN.


2) A thorough home environment discussion will help eliminate or protect against suspected REIN. Your customer should systematically try to eliminate the source of REIN interference by switching off electrical appliance(s) that may be affecting the DSL service one at a time and retesting the DSL connection.

3) Considering replacing the micro filters and purchasing an I-Plate.

The I-Plate is a filter that helps stop interference affecting the broadband signal.

If there is a suitable BT Master socket and extension wiring the I-Plate can help.

It’s quick and easy to fit and you don’t need to disconnect any wires.



If you are in any doubt, please contact the service desk at Talk Internet should you have any questions.