3Com MSR 20, MSR 30, MSR 50 manual Description of the LEDs on SIC-1FEA panel, Led, Link, Act

22CHAPTER 2: SMART INTERFACE CARDS

Table 1 Interface attributes of SIC-1FEA

Attribute	SIC-1FEA
Operating mode	10/100 Mbps autosensing
	Full duplex/half duplex

n MDI stands for Media Dependent Interface of the Ethernet. Normally, the interfaces on the network cards belong to this type. MDIX stands for Cross Media Dependent Interface, which is usually adopted on HUBs or LAN Switches.

Interface LEDs SIC-1FEA panel is shown in the following figure:

Figure 5 SIC-1FEA panel

The status description of the LEDs on SIC-1FEA panel is listed in the following table:

Table 2 Description of the LEDs on SIC-1FEA 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.

Interface Cable 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 6 Ethernet cable

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