3Com MSR 20, MSR 30, MSR 50 manual SIC-1VT1, Extending an E1 120-ohm balanced twisted pair cable

SIC-1VT1 49

If the remote device has 120-ohm interface, it is needed to use a 75-ohm-to-120-ohm adapter or use a 120-ohm cable.

2When the E1 cable is a 120-ohm balanced twisted pair cable:

■Directly connect the RJ-45 connector of the cable to the RJ-45 port of the remote equipment, if there is no need to extend the E1 cable, or

■Connect the RJ-45 connector of the cable to the network connector and the other end of the network connector to the network equipment through a 120-ohm E1 trunk cable, if cable extension is needed.

Figure 44 Extending an E1 120-ohm balanced twisted pair cable

R outer

D B-15

	R J-4 5	R J-4 5	Network
			devices such
			as DDN
Network interface connector

120 -ohm balanced twisted pair 120-ohm E1 trunk cable

Step 4: Check the status of LINK LED on the SIC-1VE1 panel: ON means the link is connected and OFF means the link is not connected. In the latter case, check the line.

SIC-1VT1

Introduction	1-port T1 voice interface card (SIC-1VT1) can handle dense voice signals in VoIP
	system. It provides a CT1/PRI/R2 port, allowing the access of 23 channels of voice
	signals.
n	■ When purchasing a SIC-1VT1 interface card, users should purchase a VCPM
	and configure a VPM based on voice traffic.
	■ No VCPM is required, but only a VPM needs to be installed on the main board
	when MSR 20-1x series routers need to be equipped with a SIC-1VT1 interface
	card.
	■ VCPM and VPM need to be installed on the main board when MSR 30 series
	routers need to be equipped with a SIC-1VT1 interface card.
	■ VCPM and VPM need to be installed on the MSCA card when MSR 50 series
	routers need to be equipped with a SIC-1VT1 interface card.
Interface Attributes	Table 23 Interface Attributes of the SIC-1T1-F
	Attribute	Description
	Connector	RJ45
	Number of connector	1