3Com MSR 20, MSR 30, MSR 50 manual LEDs on the FIC-T1 and FIC-T1-F panels, Led

	FIC-1T1/FIC-2T1/FIC-4T1 and FIC-1T1-F/FIC-2T1-F/FIC-4T1-F 175
Table 119 LEDs on the FIC-T1 and FIC-T1-F panels
LED	Description
LINK/ACT	ON means the carrier signal has been
	received.
	OFF means no carrier signal has been
	received.
	Blinking means data is being transmitted
	or/and received.
LP/AL	ON means the interface is in a loopback.
	Blinking means an AIS, LFA, or RAI alarm
	signal is present.

OFF means no loopback or alarm is present.

Note:

AIS = Alarm indication signal; LFA = loss of frame alignment; RAI = Remote alarm indication

Interface Cable Interface cables (T1 cables) for the FIC-T1/FIC-T1-F cards are 100-ohm straight-through shielded cables, as shown in the following figure:

Figure 217 T1 cable

To extend a T1 cable, you may connect the cable to another one using a network interface connector with an RJ-45 receptacle at each end.

n Both T1 cable and network interface connector are optional accessories. Please order them together with FIC-1T1/FIC-2T1/FIC-4T1 and FIC-1T1-F/FIC-2T1-F/FIC-4T1-F. By default, they are not provided.

Connecting the Interface

Cable

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

If outdoor cabling is involved, consider to install a special lightning arrester at the input end of the T1 interface cable for better lightning protection.

Step 1: Insert one end of the T1 cable into the to-be-connected RJ-45 connector on the card.

Step 2: Connect the other end of the cable to another device directly if the cable is long enough. If not, extend the cable before you do that, as shown in the following figure: