Seagate ST3300557SS Cheetah 15K.7 FC Product Manual - Page 71
FC-AL physical interface
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12.5 FC-AL physical interface Figure 12 shows the location of the J1 Fibre Channel single connection attachment (FC-SCA). Figure 14 provides the dimensions of the FC-SCA connector. Details of the physical, electrical, and logical characteristics are provided within this section. The operational aspects of Seagate's Fibre Channel drives are provided in the Fibre Channel Interface Manual.. J1 interface connector Figure 12. Physical interface 12.5.1 Physical characteristics This section defines physical interface connector. 12.5.1.1 Physical description FIbre Channel drives may be connected in a loop together or with other compatible FC-AL devices. A maximum of 127 devices may have addresses; however, one of the addresses is reserved for a fabric port switch device. This means 126 addresses are available for FC-AL devices. More FC-AL compatible devices may physically reside on the loop, but they will not be functional because they would not be able to obtain valid addresses. Port bypass circuits (PBCs) allow devices to be inserted into unpopulated locations or removed from the loop with loop operation recovery after a brief interruption. These PBCs are located external to the FC-AL device. Figure 13 shows the relationship between the PBC and FC-AL device. Port Bypass Circuit N-1 From Previous Drive Port Bypass Circuit MUX To Next Drive Port Bypass Circuit N+1 Drive N-1 Select Serial Serial In Out Drive N Figure 13. Port bypass circuit physical interconnect Drive N+1 Cheetah 15K.7 FC Product Manual, Rev. C 65