Technical Documentation

Replacing the MX960 Craft Interface

To disconnect the alarm relay wires from the router and an alarm-reporting device (see Figure 1):

Disconnect the existing wire at the external device.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
Using a 2.5-mm flat-blade screwdriver, loosen the small screws on the face of the terminal block and remove the block from the relay contact.
Using the 2.5-mm flat-blade screwdriver, loosen the small screws on the side of the terminal block. Remove existing wires from the slots in the front of the block.

Figure 1: Alarm Relay Contacts

To remove the craft interface (see Figure 2):

Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
Detach any external devices connected to the craft interface.
Loosen the captive screws at the left and right corners of the craft interface faceplate.
Grasp the craft interface faceplate and carefully tilt it toward you until it is horizontal.
Disconnect the ribbon cable from the back of the faceplate by gently pressing on both sides of the latch with your thumb and forefinger. Remove the craft interface from the chassis.

Figure 2: Removing the Craft Interface

To install the craft interface (see Figure 3):

Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
Grasp the craft interface with one hand, and hold the bottom edge of the craft interface with the other hand to support its weight.
Orient the ribbon cable so that it plugs into the connector socket. The connector is keyed and can be inserted only one way.
Align the bottom of the craft interface with the sheet metal above the card cage and press it into place.
Tighten the screws on the left and right corners of the craft interface faceplate.
Reattach any external devices connected to the craft interface.

Figure 3: Installing the Craft Interface

To connect the alarm relay wires between a router and an alarm-reporting device (see Figure 4):

Prepare the required length of replacement wire with gauge between 28-AWG and 14-AWG (0.08 and 2.08 mm²).
Insert the replacement wires into the slots in the front of the block. Use a 2.5-mm flat-blade screwdriver to tighten the screws and secure the wire.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
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.
Attach the other end of the wires to the external device.

Figure 4: Alarm Relay Contacts