3Com MSR 20, MSR 30, MSR 50 manual Extending a T1 cable

94CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES

Figure 106 T1 cable

In addition, you may use a network interface connector to extend a T1 cable. Both ends of the connector are RJ-45 jacks that can connect two network cables.

c CAUTION: Both T1 cable and network interface connector are optional accessories. Please order them together with the MIM-1T1/MIM-1T1/MIM-4T1 or MIM-1T1-F/MIM-2T1-F/MIM-4T1-F module. By default, they are not provided.

For the cable pinouts, see Low-End and Mid-Range Series Routers Cable Manual.

Connecting the Interface

Cable

c CAUTION:

■Read the mark identifying a port before you connect a cable to it, making sure it is the correct port. Wrong connection tends to damage interface modules and even the Router;

■Some protection measures are taken for MIM-1T1/MIM-2T1/MIM-4T1 module. Still, you are recommended to install a special lightning arrester at the input end of the cable leading to the outdoors in order to protect the line against lightning strikes more efficiently.

Step 1: Insert one end of a T1 cable into the RJ-45 connector on the T1 or T1-F module;

Step 2: Connect the other end of the cable to the device to be connected:

■directly if the cable is long enough; or

■after extending the cable if it is not long enough, as shown in the following figure:

Figure 107 Extending a T1 cable

Router

T1 cable (100-ohm straight-through
	shielding network cable)	Network interface connector		RJ45
					DDN, etc
RJ45			Straight-through network cable
		RJ45

Step 3: Check the behavior of the LINK LED on the MIM-T1 or MIM-T1-F panel. It is OFF when the line is faulty and signal is out of synchronization. In this case, check the link.