3Com MSR 20, MSR 30, MSR 50 manual LEDs on the FIC-4BSE panel

184CHAPTER 4: FLEXIBLE INTERFACE CARDS

Figure 225 FIC-4BSE panel

The following table describes the LEDs on the card panel.

Table 128 LEDs on the FIC-4BSE panel

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

Interface Cable The FIC-4BSE uses straight-through ISDN S/T cables, with pins 3 and 6 for data transmission, and pins 4 and 5 for data receiving. At both ends of ISDN S/T cable are RJ-45 connectors.

Figure 226 Straight-through ISDN S/T cable

Yellow	Green
Green	Yellow
RedBlack	Black
	Red

n The standard equipping package for the FIC-4BSE includes the appropriate interface cables.

Connecting the Interface

Cable

c CAUTION: If outdoor cabling is involved, consider to install a special lightning arrester at the input end of the interface cable for better lightning protection.

Before you connect a port, read its label carefully; a wrong connection can cause damages to the interface card and even the device.

Step 1: Identify the to-be-connected port on the FIC-4BSE.

Step 2: Identify the type of the ISDN line provided by your telecommunications service provider.

Step 3: Connect the cable.