3Com MSR 20, MSR 30, MSR 50 manual Interface Cable

130CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES

Table 89 Description of the DMIM-24FSW/DMIM-24FSW-PoE fiber interface LEDs

LED status	Description
Blinking green	A link is present and data is being
	transmitted and received (ACT).
Steady yellow	Error prompt

n

Interface Cable

In addition, there is a POE LED on each board, which is provided for the corresponding boards (MIM-16FSW-PoE and DMIM-24FSW-PoE) with the PoE function.

■The MIM-16FSW interface module is 1U in height, occupying two slots.

■The two GE interfaces on the DMIM-24FSW-PoE do not support the PoE function.

Normally, category-5 twisted pair cable is adopted to connect the 10BASE-T /100BASE-TX Ethernet interface to the Ethernet, as shown in the following figure:

Figure 147 Ethernet cable

Ethernet cables fall into two categories: straight-through cables and crossover cables, specifically,

■Straight-through cable: The sequences of the twisted pairs crimped by RJ-45 connectors at both ends are the same. It is used for the connection between a terminal device (e.g., PC and router) and a Hub/LAN Switch. The cables delivered with the Router are straight-through cables.

■Crossover cable: The sequences of the twisted pairs crimped by RJ-45 connectors at both ends are different. It is used for the connection between terminal devices (e.g., PC and router). And it can be made by the user.

For the pinouts of straight-through Ethernet cable and crossover Ethernet cable, see Low-End and Mid-Range Series Routers Cable Manual.

Connecting the Interface Optic Fiber

c

Connecting Ethernet fiber interface cable

CAUTION: When connecting the optical fiber, observe the following

■Do not over-bend the optical fiber. Its curvature radius must be no less than 10 cm (3.9 in).

■Ensure that the Tx and Rx ends are correctly connected.

■Ensure that the fiber ends are clean.