Replacing the Console or Auxiliary Cable on the M120 Routing Engine
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” on page 246.
To connect a management console or auxiliary device:
1.
Plug one end of the replacement cable into the appropriate
CONSOLE
or
AUX
port.
Figure 61 on page 133 shows the external device ports on the craft interface. The ports
labeled
0
connect to the Routing Engine in the left Routing Engine slot (
RE0
), and the
ports labeled
1
connect to the Routing Engine in the right Routing Engine slot (
RE1
).
2.
Plug the other end of the cable into the device's serial port.
Figure 61: M120 Routing Engine Interface Ports and Alarm Relay Contacts
Replacing Alarm Relay Wires on the M120 Craft Interface
To connect the router to external alarm-reporting devices, attach wires to the
RED
and
YELLOW
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 mm
2
),
which is not provided. Use the wire gauge appropriate for the external device you are
connecting.
To replace the wires connecting to an alarm-reporting device (see Figure 62 on page 134):
1.
Disconnect the existing wire at the external device.
2.
Prepare the required length of replacement wire with gauge between 28-AWG and
14-AWG (0.08 and 2.08 mm
2
).
3.
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.
4.
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 and insert
replacement wires. Tighten the screws to secure the wire.
133
Copyright © 2010, Juniper Networks, Inc.
Chapter 14: Replacing M120 Hardware Components
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