3Com 4005 Installation And Maintenance Manual page 51

Figure 19 shows the two available Fast Ethernet Interface Modules. Table 11
describes the purpose of the LEDs on each module.
Figure 19 Front Faceplates of Switch 4005 Fast Ethernet Interface Modules
Retaining screw
Ejector handle
Release LED
Release button
Port Link LED
Port Mode LED
RJ-45 ports
Ejector handle
Fast Ethernet Interface Modules
Slot number window
Diagnostic LED
Port Link LED
Port Mode LED
MT-RJ ports
Model number
51