3Com 1000BASE-SX - Manual (Page 7)

9-Port 1000BASE-SX Gigabit Ethernet Layer 2 Switching Module Quick Start Guide 7
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In the 16-slot chassis:
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Do not install the module in slot 8 or slot 9. These slots are
reserved for GEN Switch Fabric Modules.
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To optimize backplane performance, install the module in slot 1, 2,
3, 4, 5, 6, 7, 10, 11, or 12.
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3Com recommends that you do not install the module in slot 13,
14, 15, or 16 because these slots have only one connection to the
backplane.
Table 1, Table 2, and Table 3 list the relationship between the following:
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24-port GEN Switch Fabric Module (SFM) (Model Number 3CB9FG24
or Model Number 3CB9FG24T)
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9-port GEN Layer 2 Switching Module
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Switching module slots in the 7-slot chassis, the 8-slot chassis, and the
16-slot chassis, respectively
Table 4 and Table 5 list the relationship between the following:
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9-port GEN Switch Fabric Module (SFM) (Model Number 3CB9FG9)
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9-port GEN Layer 2 Switching Module
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Switching module slots in the 7-slot chassis and the 8-slot chassis,
respectively
Use the table information to help you select a slot for your module, as
well as administer the system after you have completed the installation.