User guide

Getting Started
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2.6.3.1 FC-AL Physical Organization
Figure 2–13 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
.
2.7 FC-AL Interface
The (I/O) interface module provides an FC-AL interface via DB9 or HSSDC connectors for copper (Cu) cable
connection. The interface has been wired to accept a Media Interface Adaptor (MIA), enabling the use of optical
media
Each I/O or Loop Resiliency Circuit board houses Port Repeater chips that re-drive the Fibre Channel signals. Each
of the LRC I/O boards also houses a number of Port Bypass circuits. The function of these circuits is to bypass the
loop connections to empty drive bays or any disk drive which is not operating correctly
The two LRC I/O boards enable the dual loops within the enclosure to be maintained independently of one another;
for example: if a Port Bypass fails that board may be replaced while the other loop is functioning normally.
Notes 1 A suitable dual loop host attachment will also be required to use this function.
2 There are no external terminators required with Fibre Channel architecture and any drive may be hot plugged
during operation.
2.7.1 Connecting Multiple Enclosures (1x12-FC-IO Module)
A daisy chained loop application is used to connect multiple enclosures.
“Daisy chain” connection of multiple enclosures can be accommodated by linking between the FC-AL Tx connector
on one enclosure and the Tx/Rx connector on the next enclosure.
Figure 2–13 Physical Organization