Used in pairs (one at each end of the cabling) these economisers allow an additional signal to be transmitted down unused wires in 4 pair cable. The four port version allows four telephones to use a single Cat5e cable. New product: the three port version carries 2 voice + 1 data signal.
![Category 5e patch lead in grey](https://tuk.co.uk/wp-content/uploads/2021/06/FP-300x300.jpg)