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

FIC-16FSW/FIC-16FSW-PoE/DFIC-24FSW/DFIC-24FSW-PoE 211

Table 156 LEDs on the FIC-16FSW/FIC-16FSW-PoE/DFIC-24FSW/DFIC-24FSW-PoE fiber interface

LED	Description
OFF	No link is present.
Steady green	A link is present, but no data is being
	transmitted and received.
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 card, which is provided for the corresponding boards (FIC-16FSW-PoE and DFIC-24FSW-PoE) with the PoE function.

The two GE interfaces on the DFIC-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 258 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 Connecting Ethernet fiber interface cable

Optic Fiber

c 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.