Specifications

1-33
Cisco ONS 15454 Installation and Operations Guide, R3.2
January 2005
Chapter 1 Hardware Installation
Alarm, Timing, LAN, and Craft Pin Connections
corresponding alarm conditions are present. Each alarm contact consists of two wire-wrap pins on the
shelf assembly backplane. Visual and audible alarm contacts are classified as Critical, Major, Minor, and
Remote. Figure 1-24 shows alarm pin assignments.
Visual and audible alarms are typically wired to trigger an alarm light at a central alarm collection point
when the corresponding contacts are closed. You can use the Alarm Cutoff pins to activate a remote ACO
for audible alarms. You can also activate the ACO function by pressing the ACO button on the TCC+
card faceplate. The ACO function clears all audible alarm indications. After clearing the audible alarm
indication, the alarm is still present and viewable in the Alarms tab in CTC.
Procedure: Install Alarm Wires on the Backplane
Step 1 Use #22 or #24 AWG alarm wires.
Step 2 Wrap the alarm wires on the appropriate wire-wrap pins according to local site practice.
Note For information about attaching ferrites to wire-wrap pin fields, see the “Ferrite Installation”
section on page 1-61.
1.9.2 Timing Installation
The ONS 15454 backplane supports two Building Integrated Timing Supply (BITS) clock pin fields. The
first four BITS pins, rows 3 and 4, support output and input from the first external timing device. The
last four BITS pins, rows 1 and 2, perform the identical functions for the second external timing device.
Table 1-2 lists the pin assignments for the BITS timing pin fields.
Note Refer to Telcordia SR-NWT-002224 for rules about provisioning timing references
Table 1-2 External Timing Pin Assignments for BITS
External Device Contact Tip & Ring Function
First external device A3 (BITS 1 Out) Primary ring (-) Output to external device
B3 (BITS 1 Out) Primary tip (+) Output to external device
A4 (BITS 1 In) Secondary ring (-) Input from external
device
B4 (BITS 1 In) Secondary tip (+) Input from external
device
Second external device A1 (BITS 2 Out) Primary ring (-) Output to external device
B1 (BITS 2 Out) Primary tip (+) Output to external device
A2 (BITS 2 In) Secondary ring (-) Input from external
device
B2 (BITS 2 In) Secondary tip (+) Input from external
device