3Com 1000BASE-SX quick start In the CoreBuilder 9000 7-slotchassis

2-Port 1000BASE-SX and 2-Port 1000BASE-LX Gigabit Ethernet Interface Modules Quick Start Guide 7

Module Placement in Note the following chassis slot restrictions and recommendations when the Chassis you choose a chassis slot for a GEN Interface Module.

In the CoreBuilder 9000 7-slot chassis:

■Do not install the module in slot 7. This slot is reserved for a GEN Switch Fabric Module.

■Install the module in slot 1, 2, 3, 4, 5, or 6.

In a CoreBuilder 9000 16-slot chassis:

■Do not install the module in slot 8 or 9. These slots are reserved for GEN Switch Fabric Modules.

■To optimize backplane performance, install the module in slot 1, 2, 3, 4, 5, 6, 7, 10, 11, or 12.

■3Com recommends that you do not install the module in slot 13, 14, 15, or 16, because these slots only have one connection to the backplane and the GEN Switch Fabric Modules (see Table 2). If you install a GEN Interface Module into one of these slots, you can only use one of the module’s front panel ports. The GEN Switch Fabric Module automatically disables the second port.

Table 1 and Table 2 list the relationship between the 24 Gbps Gigabit Ethernet (GEN) Switch Fabric Module (3CB9FG24) and the interface module slots in the 7-slot chassis and the 16-slot chassis, respectively. Use the information to help select a slot for your module, as well as for administration purposes after you have completed the installation.