1-11
Cisco ONS 15600 SDH Reference Manual, Release 9.0
78-18400-01
Chapter 1 Shelf and Backplane Hardware
1.7.2 Timing Installation
Figure 1-9
Alarm Pin Assignments on the CAP/CAP2
Visual and audible alarms can be wired to trigger an alarm light at a central alarm collection point when
the corresponding contacts are closed.
1.7.1.2 Alarm Cutoff and PDU Alarms
The PDU Alarm connection controls the visual alarm indicators on the front of the PDU. You can also
activate the alarm cutoff (ACO) function by pressing the ACO button on the TSC card faceplate. The
ACO function extinguishes all audible alarm indications, but the alarm is still raised in Cisco Transport
Controller (CTC).
1.7.2 Timing Installation
The ONS 15600 SDH backplane supports two 100-ohm BITS clock pin fields.
shows the pin
assignments for the BITS timing pin fields.
Note
Refer to Telcordia SR-NWT-002224 for rules about provisioning timing references.
Note
See
for more information.
78510
16 15
14 13
12 11
10 9
8
7
6
5
4
3
2
1
BITS - B
BITS - A
EXTERNAL
ALARMS
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
5
4
3
2
1
Normally open
Common
Normally closed
Short for alarm,
-48 VDC provided
Alarm IN
48 VDC provided
short contacts
FRAME
GROUND
