3Com 10-Port 100BASE-FX Quick Start Manual page 12

12 10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Table 5 Mapping the 24-port GEN SFM and the 20-port FEN Switching Module to the 8-slot Chassis
Chassis Number of SFM
Slot Backplane Ports
Number Allocated to Slot
1 4; up to 2 can be
accessed by this
module
2 4; up to 2 can be
accessed by this
module
3 4; up to 2 can be
accessed by this
module
4 4; up to 2 can be
accessed by this
module
5 4; up to 2 can be
accessed by this
module
6 4; up to 2 can be
accessed by this
module
7 Reserved for an SFM Not applicable
8 Reserved for an SFM Not applicable
20-port Switching SFM Backplane Port
Module Backplane Numbers Assigned to
Port Numbers Chassis Slot
21 1
22 2
21 5
22 6
21 9
22 10
21 13
22 14
21 17
22 18
21 21
22 22
Not applicable
Not applicable
SFM LED Numbers
Assigned to Backplane
Port Numbers
1
2
3
4
5
6
7
8
9
10
11
12
Not applicable
Not applicable