Juniper Networks M5 - Manual (Page 35)

Craft Interface
For information about the elements on the craft interface, see the following sections:
•
Alarm LEDs and Lamp Test Button on page 15
•
Routing Engine Interface Ports and Status Indicators on page 15
•
PIC Offline Buttons on page 16
Alarm LEDs and Lamp Test Button
Two large alarm LEDs are located at the top of the craft interface. The circular red LED lights
to indicate a critical condition that can result in a system shutdown. The triangular yellow
LED lights to indicate a less severe condition that requires monitoring or maintenance. Both
LEDs can be lit simultaneously. The button labeled LT (for “lamp test”), located to the left of
the alarm LEDs, causes all LEDs on the craft interface to light when pressed and held; use it
to test that LEDs are functional.
Table 4 describes the alarm LEDs and lamp test button in more detail.
Table 4: Alarm LEDs and Lamp Test Button
Shape Color State Description
Red On steadily Critical alarm LED—Indicates a critical condition
that can cause the router to stop functioning.
Possible causes include component removal,
failure, or overheating.
Yellow On steadily Warning alarm LED—Indicates a serious but
nonfatal error condition, such as a maintenance
alert or a significant increase in component
temperature.
— — Lamp test button—Causes all LEDs on the craft
interface to light (for testing purposes), when
pressed and held.
Routing Engine Interface Ports and Status Indicators
Below the alarm LEDs on the craft interface are ports for connecting the Routing Engine
to one or more external devices on which system administrators can issue JUNOS
command-line interface (CLI) commands to manage the router (see Figure 7). The ports with
the indicated label in each set function as follows:
•
MGMT—Connects the Routing Engine through an Ethernet connection to a
management LAN (or any other device that plugs into an Ethernet connection) for
out-of-band management. The port uses an autosensing RJ-45 connector to support
both 10- and 100-Mbps connections.
To the left of the port is a link status indicator, which lights to show that a link has
been established over the Ethernet connection. To the right of the port is an activity
indicator, which flashes when data is being transferred.
Hardware Component Overview 15