Seagate ST300MM0026 Savvio 10K.1 FC Product Manual - Page 66

FC-AL physical interface

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9.5 FC-AL physical interface Figure 14 shows the location of the J1 Fibre Channel single connection attachment (FC-SCA). Figure 16 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.. Figure 14. 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 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 15 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 15. Port bypass circuit physical interconnect Drive N+1 60 Savvio FC Product Manual, Rev. D

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60
Savvio FC Product Manual, Rev. D
9.5
FC-AL physical interface
Figure 14 shows the location of the J1 Fibre Channel single connection attachment (FC-SCA). Figure 16 pro-
vides 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
..
Figure 14. 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
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 15 shows the relationship between the PBC and FC-AL device.
Figure 15. Port bypass circuit physical interconnect
Port Bypass
Circuit N–1
Select
Drive N–1
Port Bypass
Circuit N+1
Drive N+1
Drive N
Serial
In
Serial
Out
From Previous
Drive
Port Bypass
Circuit
To Next
Drive
MUX