3Com 4007, Implementation Manual, Page: 140 / 684

140 C
HAPTER
7: P
HYSICAL
P
ORT
N
UMBERING
Allocating Switch
Fabric Capacity to
Slots
This section describes how the capacities of the 9-port and 24-port
Gigabit Ethernet Switch Fabric Modules are distributed to the other
switching module slots in the chassis.
9-port GEN Switch
Fabric Module
The capacity of the 9-Port Gigabit Ethernet (GEN) Switch Fabric Module
(3CB9FG9) is distributed across the slots in the chassis. The module
capacity is expressed in terms of
backplane ports .
When a switching module is installed, its rear ports communicate with
the switch fabric module backplane ports that are assigned to its slot.
The module’s six backplane ports are assigned to the chassis slots as
indicated in Table 33.
Using Table 33: Examples
Suppose you installed a 9-port Switch Fabric Module. Next, you installed
a 36-port Fast Ethernet Layer 2 Switching Module in slot 4. After both
module’s boot sequences were finished, you should see a LED#4 on the
switch fabric module to be lighted green. This indicates that the
switching module recognizes that there is a module in slot 4.
Next, in that same chassis, suppose you installed a 4-port Gigabit
Ethernet Multilayer Switching Module in slot 5. After it completed its
boot sequence, you would look for LED#5 to become lighted on the
switch fabric module. Notice that, although the module in slot 5 has four
backplane ports (see Table 32), only one of them can pass traffic to the
switch fabric module.
Table 33 Mapping the 9-Port GEN Switch Fabric Module (SFM)
Chassis
Slot No.
SFM backplane port
number that is assigned
to the slot SFM LED that is
assigned to the
backplane port
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
6 6 6
7 Not applicable. Switch fabric module slot only.