Alarm Relay Contacts; Midplane In An Ex9200 Switch; Figure 10: Alarm Relay Contacts In Ex9200 Switches - Juniper EX9214 Hardware Manual

Alarm Relay Contacts

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Midplane in an EX9200 Switch

Copyright © 2015, Juniper Networks, Inc.
The craft interface has two alarm relay contacts for connecting the switch to external
alarm devices. Whenever a system condition triggers either the critical (major alarm) or
warning (minor alarm) alarm on the craft interface, the alarm relay contacts are also
activated. The alarm relay contacts are located on the upper right of the craft interface.
Figure 10 on page 25 shows the alarm relay contacts in EX9200 switches.

Figure 10: Alarm Relay Contacts in EX9200 Switches

Alarm
relay
contacts
Craft Interface panel
EX9204 Switch Hardware Overview
EX9208 Switch Hardware Overview
EX9214 Switch Hardware Overview on page 3
The midplane is located on the rear of the chassis and forms the rear of the card cage.
The Switch Fabric modules (SF modules) and line cards are installed into the midplane
from the front of the chassis, and the power supplies install into the midplane from the
rear of the chassis. The cooling system components also connect to the midplane.
The midplane performs the following major functions:
Provides a data path—Data packets are transferred across the midplane between the
line cards through the Switch Fabric on the host subsystem.
Distributes power—The power supplies connect to the midplane, which distributes
power to all the switch components.
Provides a signal path—The midplane provides the signal path to the line cards, Switch
Fabric, and other system components for monitoring and control of the system.
Figure 11 on page 26 shows the midplane in an EX9204 switch.
the midplane in an EX9208 switch.
switch.
Chapter 2: Chassis Components and Descriptions
Figure 13 on page 27 shows the midplane in an EX9214
Figure 12 on page 26 shows
25