Juniper MX2020 Hardware Manual page 58

Figure 12: Extended Craft Interface
0
Table 10: Craft Interface LEDs, Buttons, and Connectors
Function No.
1
2
3
4
5
6
7
8
Label
PSM
FANTRAYS
RE0 (MASTER, ONLINE, and
OFFLINE)
RE1 (MASTER, ONLINE, and
OFFLINE)
MINOR ALARM
MAJOR ALARM
ACO/LT
M/S CHASSIS NUM
MINOR ALARM–[NC C NO]
MAJOR ALARM–[NC C NO]
Description
Status LEDs for PSMs 0 through 8 and 9 through
17
Status LEDs for fan trays 0 through 3
Two sets of status LEDs per host subsystem.
There are three LEDs per Routing Engine.
Minor Alarm LED for monitoring or maintaining
the MX2020
Major Alarm LED for critical conditions, that can
result in system shutdown
Alarm Cutoff/ Lamp Test Button. Turns off both
minor and major alarms and deactivates the
device attached to the corresponding alarm relay
contact on the craft interface
Chassis ID and Standalone Dial. These two dials
are used. One dial is used to indicate the chassis
number for multi-chassis configurations. The
second dial is used to indicate whether the
chassis is operating in standalone mode or as
part of a multi-chassis system.
Two sets of alarm terminal contacts. Each
consisting of normal open and normal closed
relays that signal a minor or major alarm when
broken.
32