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Chapter 1 Shelf and Backplane Hardware
Figure 1-9
Normally closed
Common
Short for alarm,
-48 VDC provided
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 backplane supports two 100-ohm BITS clock pin fields.
assignments for the BITS timing pin fields.
Refer to Telcordia SR-NWT-002224 for rules about provisioning timing references.
Note
Note
64K and E1 timing are not used with SONET systems. See
Alarm Pin Assignments on the CAP/CAP2
Normally open
16 15 14 13 12 11 10 9
5
4
3
2
1
10
9
FRAME
EXTERNAL
ALARMS
8
7
8
7
6
5
1.7.2 Timing Installation
6
5
4
3
2
1
4
3
2
GROUND
Alarm IN
48 VDC provided
short contacts
Figure 1-10
Chapter 6, "Timing,"
for more information.
Cisco ONS 15600 Reference Manual, R8.0
5
4
3
2
1
1
shows the pin
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