Coupling device (Line Matching Unit)

COD_9 together with coupling capacitor CC ensures reliable connection of PLC terminal(s) to the HV power line. It matches the impedance of the HV power line and the PLC terminals enabling maximization of the transmit signal power actually transmitted to the transmission media. At the same time it protects PLC terminals and maintenance personnel from high voltage of the HV power line and from transient over-voltages (power switching and atmospheric discharges).

cod 9 

PGC_9     Universal PLC Terminal
PST_9-A  Protection Signalling Terminal
ACT_9      Analogue Channel Terminal
NBM_9     Programmable FSK Narrow-Band Modem