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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter1 Hardware Installation
Alarm, Timing, LAN, and Craft Pin Connections
Note The X.25, Modem, and TBOS pin fields are not active.
1.9.1 Alarm Installation
The alarm pin field supports up to 17 alarm contacts, including four a udible alarms, four visual alarms,
one alarm cutoff (ACO), and four user-definable al a rm i np ut an d ou tp ut c on tac t s.
Audible alarm contacts are in the LOCAL ALARM AU D pin field and visual contacts are in the LOCAL
ALARM VIS pin field. Both of these alarms are in the LOCAL ALARMS category. User-definable
contacts are in the ENVIR ALARM IN and EN VIR ALARM OUT pin fields. These alarms ar e i n t h e
ENVIR ALARMS category; you must have the AIC card installed to use the ENVIR ALAR MS. Alarm
contacts are Normally Open (N/O), meaning that th e sys tem clos es the alar m contac ts wh en th e
corresponding alarm conditions are presen t. Ea ch a lar m co ntac t c on s is ts of tw o wir e- wr ap p ins o n t h e
shelf assembly backplane. Visual and audible alarm contacts are classified as Critic al, Major , Minor , a nd
Remote. Figure 1-24 shows alarm pin assignments.
Visual and audible alarms are typically wired to trigger an alarm light at a ce nt ral alar m coll ection point
when the corresponding contacts are closed. Y ou can use the Alarm Cutoff pins to a ctivate 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 timin g device.
Table 1 -2 lists the pin assignments for the BITS timing pin fields.