3Com MSR 20, MSR 30, MSR 50 manual Following table describes the LEDs on the panels, Led

106CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES

Table 65 Interface attributes of MIM-1AMM/MIM-1ASM/MIM-1ASL

	MIM-1ASL
Attribute	MIM-1AMM module MIM-1ASM module module

Cable type and the	Multimode optical fiber
maximum transmission	of 2 km (1.2 mi.)
distance	transmission distance

Single-mode optical	Single-mode
fiber of 15 km (9.32	optical fiber of 30
mi.) transmission	km (18.6 mi.)
distance	transmission
	distance

Transmitter	LED	Laser	Laser
Transmission optical	Min: -21 dBm	Min: -15 dBm	Min: -5 dBm
power	Max: -14 dBm	Max: -8 dBm	Max: 0 dBm
Receiver sensitivity	Min: -28 dBm	Min: -30 dBm	Min: -34 dBm
	Max: -8 dBm	Max: -14 dBm	Max: -10 dBm
Central wavelength	1310 nm
Service	ATM Traffic CBR (Constant Bit Rate), rt_VBR (Variable Bit Rate-Real
	Time), nrt_VBR (Variable Bit Rate-Non Real Time), UBR (Unspecified Bit
	Rate)

Interface LEDs MIM-1AMM/MIM-1ASM/MIM-1ASL module panels are shown in the following figures:

Figure 117 MIM-1AMM panel

Figure 118 MIM-1ASM panel

Figure 119 MIM-1ASL panel

The following table describes the LEDs on the panels:

Table 66 Description of the LEDs on the MIM-1AMM/MIM-1ASM/MIM-1ASL panel

LED	Description
LINK	OFF means no link is present; ON means a
	link is present.
ACT	OFF means no data is being transmitted or
	received; blinking means data is being
	received or/and transmitted.