Fc-Al Physical Interface; Physical Characteristics; Figure 15. Physical Interface; Figure 16. Port Bypass Circuit Physical Interconnect - Seagate ST318203FC Product Manual

Cheetah 18LP FC Product Manual, Rev. D
9.5

FC-AL physical interface

Figure 15 shows the location of the J1 Fibre Channel single connection attachment (FC-SCA) and the J6 con-
nector. Figure 17 provides the dimensions of the FC-SCA. Figure 18 provides the dimensions of the J6 connec-
tor.
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..
Figure 15. Physical interface
9.5.1

Physical characteristics

This section defines physical interface connector.
9.5.1.1 Physical description
FIbre Channel drives may be connected in a loop together or with other compatible FC-AL devices. A maxi-
mum 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 phys-
ically 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 16 shows the relationship between the PBC and FC-AL device.
Port Bypass
Circuit N–1
Figure 16. Port bypass circuit physical interconnect
From Previous
Drive
Drive N–1
J6
Port Bypass
Circuit
To Next
Drive
MUX
Select
Serial Serial
In Out
Drive N
Port Bypass
Circuit N+1
Drive N+1
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