Cisco XR 12410 - Manual (Page 81)

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Cisco XR 12410 and Cisco XR 12810 Router Installation Guide
OL-17441-01
Chapter 2 Preparing for Installation
Alarm Display Connection Guidelines
Alarm Display Connection Guidelines
The router alarm system consists of the following cards:
• Two alarm cards—Installed in the switch fabric and alarm card cage. They do
not have any indicators, connectors, or switches.
• One alarm display card—Mounted on the front of the router chassis, just
above the horizontal cable management tray.
The alarm display card has two 25-pin D-subconnectors (ALARM A and
ALARM B) on the front panel that connect the router to an external site alarm
maintenance system (
Figure 2-17 ). When a critical, major, or minor alarm is
generated, it energizes the alarm relays on the alarm card to activate the
external site alarm.
Figure 2-17 Alarm Display Card Front Panel
The alarm relay contacts on the alarm card consist of standard common, normally
open, and normally closed relay contacts that are wired to the pins on the
connectors.
Caution Only safety extra-low voltage (SELV) circuits can be connected to the alarm
connector. Maximum rating for the alarm circuit is 2 A, 50 VA.
Note To comply with the intrabuilding lightning surge requirements of
GR-1089-CORE, Issue II, Revision 01, February 1999, you must use a shielded
cable when connecting to the external alarm ports on the alarm card. The shielded
cable is terminated by shielded connectors on both ends, with the cable shield
material tied to both connectors.
ALARM A ALARM B
A
A
MBUS
MIN OR
B FAIL
ENABLE MA JO R CR ITIC AL B 0
CSC
1 0
SFC
1 2 3 4
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