3Com 100BASE-FX, 10/100BASE-TX quick start Not applicable

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 13

Table 6 Mapping the 24-port GEN SFM and the 20-port FEN Switching Module to the 16-slot Chassis

Chassis	Number of SFM	20-port Switching	SFM Backplane Port	SFM LED Numbers
Slot	Backplane Ports	Module Backplane	Numbers Assigned to	Assigned to Backplane
Number	Allocated to Slot	Port Numbers	Chassis Slot	Port Numbers
1	2	21	1	1
		22	2	2
2	2	21	3	3
		22	4	4
3	2	21	5	5
		22	6	6
4	2	21	7	7
		22	8	8
5	2	21	9	9
		22	10	10
6	2	21	11	11
		22	12	12
7	2	21	13	13
		22	14	14
8	Reserved for an SFM	Not applicable	Not applicable	Not applicable
9	Reserved for an SFM	Not applicable	Not applicable	Not applicable
10	2	21	15	15
		22	16	16
11	2	21	17	17
		22	18	18
12	2	21	19	19
		22	20	20
13	1	21	21	21
14	1	21	22	22
15	1	21	23	23
16	1	21	24	24