Adaptec LSM-FC2002 - Loop Resiliency And SES Module Expansion, Installation Manual

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Setting Fibre Channel Loop Speed (2Gb or 1Gb)
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1Gb Operation
To set the fibre channel loop speed to 1Gb operation:
1 Remove the LS module from the front of the enclosure.
2 On the LS Module locate the jumper position JP2 (Figure 2-1).
3 For 1Gb operation there should be no jumper installed at JP2. If
one is installed, remove it.
4 Replace the LS module.
Figure 2-1 Location of Jumpers on LS Module