Communication Channels

Communication Channels

Channel	Protocol	If Down
POS -> PDC	TCP/IP	Payment fails at POS
PDC -> PED	Varies by device	Transaction times out
PDC -> TMS	HTTP / HTTPS	"TMS offline" mode -- payments still work

Tip: PDC only needs to reach TMS once to get config and start taking payments.

The PDC is resilient to TMS connectivity loss. Once it has received its initial configuration from TMS, it can continue processing payments independently. POS-to-PDC and PDC-to-PED connectivity is required for each transaction.