Connecting the M120 Router to Management and Alarm Devices

For management and service operations, you connect the Routing Engine to an external console or management network through ports on the Craft Interface. You can also connect the router to external alarm-reporting devices through the alarm relay contacts on the CIP. (For more information, see M120 Craft Interface Description.)

After you have installed the router into the rack, attach one or more external devices to the ports on the CIP that connect to the Routing Engines for management and service operations (see Figure 1). For specifications for the cable accepted by the Routing Engine management ports, see Routing Engine Interface Cable and Wire Specifications for the M120 Router.

Figure 1: M120 Routing Engine Management Ports and Alarm Relay Contacts

Connecting the M120 Router to a Management Console or Auxiliary Device

To use a system console to configure and manage the Routing Engine, connect it to the appropriate CONSOLE port on the craft interface. To use a laptop, modem, or other auxiliary device, connect it to the appropriate AUX port on the craft interface. Both ports accept a cable with an RJ-45 connector. One RJ-45/DB-9 cable is provided with the router. To connect a device to the other port, you must supply another cable. For cable specifications, see Routing Engine Interface Cable and Wire Specifications for the M120 Router.

To connect a management console or auxiliary device:

1. Turn off the power to the console or auxiliary device.
2. Plug the female end (shown in Figure 2) of the provided serial cable into the appropriate CONSOLE or AUX port. Figure 3 shows the external device ports on the CIP. The ports labeled HOST 0 connect to the Routing Engine in the upper Routing Engine slot (RE 0), and the ports labeled HOST 1 connect to the Routing Engine in the lower Routing Engine slot (RE 1).
3. Using a 2.5-mm flat-blade screwdriver, tighten the screws on the connector.
4. Attach the other end of the cable to the console or auxiliary device.

Figure 2: M120 Console and Auxiliary Serial Port Connector

Figure 3: M120 Routing Engine Management Ports and Alarm Relay Contacts

Connecting the M120 Router to a Network for In-Band Management

To connect the Routing Engine to a network for out-of-band management, connect an Ethernet cable with RJ-45 connectors to the ETHERNET port on the craft interface. One such cable is provided with the router. For cable specifications, see Routing Engine Interface Cable and Wire Specifications for the M120 Router. To connect the Routing Engine to a network for out-of-band management:

1. Turn off the power to the management device.
2. Plug one end of the Ethernet cable (Figure 4 shows the connector) into the appropriate ETHERNET port on the CIP. Figure 5 shows the external device ports on the CIP. The ports labeled HOST 0 connect to the Routing Engine in the upper Routing Engine slot (RE 0), and the ports labeled HOST 1 connect to the Routing Engine in the lower Routing Engine slot (RE 1).
3. Plug the other end of the cable into the network device.

Figure 4: M120 Routing Engine Ethernet Cable Connector

Figure 5: M120 Routing Engine External Device Ports

Connecting the M120 Router to an External Alarm-Reporting Device

To connect the router to external alarm-reporting devices, attach wires to the RED ALARM and YELLOW ALARM relay contacts on the craft interface. A system condition that triggers the red or yellow alarm LED on the craft interface also activates the corresponding alarm relay contact.

The terminal blocks that plug into the alarm relay contacts are supplied with the router. They accept wire of any gauge between 28-AWG and 14-AWG (0.08 and 2.08 mm²), which is not provided. Use the wire gauge appropriate for the external device you are connecting.

To connect an external device to an alarm relay contact (see Figure 6):

1. Prepare the required length of wire with gauge between 28-AWG and 14-AWG (0.08 and 2.08 mm²).
2. While the terminal block is not plugged into the relay contact, use a 2.5-mm flat-blade screwdriver to loosen the small screws on its side. With the small screws on its side facing left, insert wires into the slots in the front of the block based on the wiring for the external device. Tighten the screws to secure the wire.
3. Orient the terminal block according to the labels to the left of the appropriate relay contact (NC means “normally closed, C means “common,” and (NO means “normally open”).
4. Plug the terminal block into the relay contact and use a 2.5-mm flat-blade screwdriver to tighten the screws on the face of the block.
5. Attach the other end of the wires to the external device.

Figure 6: M120 Routing Engine Alarm Relay Contacts

If attaching a reporting device for the other kind of alarm, repeat the procedure.