Intergraph Fibre Channel, User Manual, Page: 61 / 84

Installation
3
and 3/3 which contain Port Bypass Circuits (PBC) that provide loop resiliency in the event of unplugged or failing
drives.
Notes 1 Figure 1–3 shows the logical routing of the FC-AL interface through the drive bays.
2 This figure does not represent the physical wiring of the enclosure.
1.5.2 FC-AL Physical Organization
Figure 1–4 shows the two FC-AL loops, these are each routed through independent LRC I/O cards fitted in the rear
of the enclosure. Either of these may be removed while the other is operating, thus providing fully redundant FC-
AL operation.
LRC Input/Output Modules are fitted in bays 3/2 and 3/3. Each module includes DB9 connectors for FC-AL
attachment, shown in Figure 1–5 .
Figure 1–3 FC-AL Logical Layout
3/1 4/1
4/2
4/3 3/3
3/2
2/1
2/3
2/2
1/3
1/2
1/1
D C B A
9 8 7 6
5 4 3 2
Drive Bays - Front View
Device ID (Low Order Bits) Bay Number
Loop 1 Loop 2
Figure 1–4 Physical Organization
PBC PBC
PBC PBC
4/3
3/2
2/1
4/2
3/1
1/3
4/1
2/3
1/2
3/3
2/2
1/1
PBC PBC
RPTR RPTR
RPTR RPTR
RPTR RPTR
LRC/10 LRC/10 Backplane