These adapters allow analogue telephones / modems to be connected to Ethernet (Cat 5) wall sockets or UTP networks, with a view to running a phone system over Cat 5 structured cabling.
This variant is suitable as a 'Full Master', and can be used to terminate a PSTN Exchange telephone line. It is very similar to our product 80.503 except that in this device also contains a Master socket surge arrestor, which will absorb voltage spikes wich may be picked up on an Exchange telephone line. Both this product and 80.503 contain ring capacitors.
For the avoidance of confusion, this device does not perform an electronic PSTN to ISDN conversion.