Bang & Olufsen BEOLINK Handbook page 44

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LED tester
MASTER LINK
Simple circuit tester for troubleshooting Master Link/Power Link systems.
Using this tester you can quickly find breaks or poor connections in the
system.
This LED tester consists of two boxes and two Master Link cables.
The main box connects to the Master Link system. When turned on, the
main box sends an electric pulse through each individual core in the
Master Link cable.
The LED box can then be connected to the remaining Master Link
connections one by one. A range of LEDs will light up as the main box sends
the pulses through the individual cores. This enables you to easily see if
there is a circuit in all cores and thus locate the defective link (e.g. junction
box or wall socket). If an LED is weakly illuminated it means that there is a
poor connection. There is also an output and input for testing Power Link
cables.
The illustration shows typical Master Link system connections. We will use
this system as an example to show how the LED tester tests the Master Link
cable circuits.
Professional tool for troubleshooting
ML/PL installations.
Circuit tester for connections/cables
and sockets.
8053404 ML/PL cable tester