Replacing The Console Or Auxiliary Cable On The M120 Routing Engine; Replacing Alarm Relay Wires On The M120 Craft Interface; Figure 61: M120 Routing Engine Interface Ports And Alarm Relay Contacts - Juniper Networks Hardware Manual

Replacing the Console or Auxiliary Cable on the M120 Routing Engine

Replacing Alarm Relay Wires on the M120 Craft Interface

Copyright © 2010, Juniper Networks, Inc.
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To use a system console to configure and manage the Routing Engine, connect it to the
appropriate port on the craft interface. To use a laptop, modem, or other
CONSOLE
auxiliary device, connect it to the appropriate
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:
Plug one end of the replacement cable into the appropriate
1.
Figure 61 on page 133 shows the external device ports on the craft interface. The ports
labeled connect to the Routing Engine in the left Routing Engine slot (
0
ports labeled connect to the Routing Engine in the right Routing Engine slot (
1
Plug the other end of the cable into the device's serial port.
2.

Figure 61: M120 Routing Engine Interface Ports and Alarm Relay Contacts

To connect the router to external alarm-reporting devices, attach wires to the
relay contacts on the craft interface. A system condition that triggers the red
YELLOW
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
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):
Disconnect the existing wire at the external device.
1.
Prepare the required length of replacement wire with gauge between 28-AWG and
2.
14-AWG (0.08 and 2.08 mm
Using a 2.5-mm flat-blade screwdriver, loosen the small screws on the face of the
3.
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
4.
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.
Chapter 14: Replacing M120 Hardware Components
port on the craft interface. Both ports
AUX
2
).
CONSOLE or AUX port.
), and the
RE0
).
RE1
and
RED
2
),
133