The PA-8RSTY circuit card is equipped with eight circuits of Registers and Senders.
Mnfr. Part #: PA-8RSTY
NEC NEAX2400 IMS Register Sender Trunk Circuit Card
Contains Dial Pulse Register (DPR), Push Button Receiver (PBR) for receiving digits from extensions and/or the associated incoming trunks and Dial Pulse Sender (DPS), PB Signal Sender (PBS) for sending digits to a distant switching system.
Has Register Sender function, by which inter-digit pause can be changed and PB signals may be converted to DP signals and vice versa without intervention of the CPU.