3Com MSR 50, MSR 30, MSR 20 manual There are many types of fiber-optic connectors, such as

140CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES

c CAUTION: For a long-haul fiber-optic interface, the transmission distance must be longer than 25 km (15.5 in.) to allow the receiver to work. In case of closer distances, insert an optical attenuator to reduce the input optical power.

Interface LEDs The following figures illustrate the MIM-1CPOS(E) and MIM-1CPOS(T) panels:

Figure 159 MIM-1CPOS(E) front panel

Figure 160 MIM-1CPOS(T) front panel

The following table describes the LEDs on the MIM-1CPOS(E)/MIM-1CPOS(T) panel.

Table 97 LEDs on the MIM-1CPOS(E)/MIM-1CPOS(T) 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
	transmitted.

Interface Optical Fiber The MIM-1CPOS module can only be connected with an optical fiber cable with an LC-type fiber-optic connector.

Figure 161 LC-type fiber-optic connector

n Fiber-optic connectors, according to ITU, are passive components used to stably but not permanently connect two or more optical fibers. They are indispensable to a fiber-optic communications system in the sense that it allows add/drop connections between optical channels.

There are many types of fiber-optic connectors, such as

■FC: round fiber-optic connector with screw thread