Products are needed to abide by a protocol so the interrupt-request (IRQ) traces is often shared. The PCI bus features 4 interrupt traces, INTA# as a result of INTD#, all of which can be found to every product. Approximately 8 PCI devices share exactly the same IRQ line (INTINA# by https://nathanlabsadvisory.com/how-nist-800-171-compliance-consulting-in-usa-can-secure-your-business-data/