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1.1 Topologies in SAS Interface
C141-C013 25
A wide port is created if there is more than one phy in the port. A narrow port is a
port with only one phy.
A wide link is the set of physical links that attach a wide port to another wide
port. A narrow link is the physical link that attaches a narrow port to another
narrow port.
Figure 1.4 shows examples of narrow ports and wide ports, with a representation
of the SAS address transmitted during the identification sequence. Although
several phys on the left transmit SAS addresses of B, only phys attached to the
same SAS addresses become part of the same ports. The set of phys with SAS
address B attached to the set of phys with SAS address D become one port, while
the set of phys with SAS address B attached to the set of phys with SAS address E
become another port.
Figure 1.4 Ports (narrow ports and wide ports)