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Cisco ONS 15600 Reference Manual, R7.2
Chapter 1 Shelf and Backplane Hardware
1.7 Alarm, Timing, LAN, and Craft Pin Connections
If the CAP fails, the node raises an EQPT alarm. You can replace the CAP on an in-service system
without affecting traffic. To replace a CAP, refer to the Cisco ONS 15600 Procedure Guide. Always
replace the CAP during a maintenance window.
1.7 Alarm, Timing, LAN, and Craft Pin Connections
Caution
Always use the supplied ESD wristband when working with a p owered ONS 15600 or any ONS 15600
components. Plug the wristband cable into one of the ESD jacks located on the lower-left outside edge
of the bay assembly and at the bottom rear of the shelf.
The ONS 15600 has a backplane pin field located at the bottom rear of the shelf that is part of the CAP.
The CAP provides 0.045 square inch (0.290 square centimeter ) wire-wrap pins for enabling alarm inputs
and outputs and timing input and output. This section describes the backplane pin field and pin
assignments, as well as timing and LAN connections. See the “1.6 Customer Access Panel” section on
page 1-7 for more information.

1.7.1 External Alarm and Control Contact Installation

The external (environmental) alarm contacts cons ist of the wire-wrap pin field and two D-Sub 15s. The
alarm pin field supports up to 16 alarm inputs (external alarms) and 16 alarm outputs (external controls).
The two D-Sub 15s support four aud ible alarms, four visual alarms, one al arm cutoff (ACO), a PDU Fail
A, and a PDU Fail B.
By connecting to different wire-wrap pins on the CAP, the alarm outputs can be configured for either
normally open (NO) or normally closed (NC) operation (see Figure 1-9). The alarm inputs consist of two
wire-wrap pins on the CAP and the alarm outputs con sist of three wire-wrap pins.

1.7.1.1 Visual and Audible Alarms

Visual and audible alarm contacts are provisioned as Critical, Major, Minor, and Remote. Figure 1-9
shows alarm pin assignments.