The GTFPI (Gigabit-Transceiver Front Panel Interface) card is a rail-mounted card that creates TTL-level electrical signals from digital signals exchanged with a PB5 processor card. These signals are made available on interface panels, typically located on the front of a simulator cubicle. All cubicles include at least one GTFPI card, which can connect to one Low Voltage Digital Input/Output Interface Panel and one 250 Vdc Digital Output Interface Panel.
Low Voltage Digital Input/Output Interface Panel
This rack-mounted panel is located in the front of the simulator cubicle and is used for easy access to the TTL-level digital input and output from the GTFPI card. The digital inputs are normally high (5 V) which is ideal for the easy connection of dry contact outputs from conventional protection equipment. All cubicles include one low voltage digital input/output interface panel by default.
250 Vdc Digital Output Interface Panel
This rack-mounted panel is typically located in the front of the simulator cubicle. It is used to provide dry contacts controlled by the GTFPI card’s TTL-level digital output port. This panel is capable of switching up to 250 Vdc (i.e. station-level voltage) for breaker status signals.