Single Attached Station (SAS)

Just has one card, e.g. HPs with a single connection S-PORT with 2 pins, Pin and Pout. Date enters via Pin and leaves via Pout

Dual Attached Stations (DAC)

Has two cards known as the A port and the B port. There are two rings, one providing backup for the other. Data enters the A port via Pin and leaves the B port via Pout. The B port then connectes to the A port of another station or to a concentrator.

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