1-9
Cisco ONS 15600 SDH Reference Manual, Release 9.0
78-18400-01
Chapter 1 Shelf and Backplane Hardware
1.6 Customer Access Panel
•
Four visual alarm interfaces via a DB-15 connector that is surge-protected and EMI-filtered. The
visual alarm indication is provided by the TSC card and the signal is connected to the PDU where
LEDs indicate the alarm status and severity.
•
Environmental (external) alarms and controls (16 inputs and 16 outputs) via wire-wrap pins. The
interface is surge-protected and provides isolation by using an opto-isolator for alarm inputs and
relays for alarm outputs. By connecting to different wire-wrap pins on the CAP/CAP2, the alarm
outputs can be configured for either normally open (NO) or normally closed (NC) operation. Alarms
are initiated by shorting these contacts. The alarm input interface provides a pair of positive and
negative wire-wrap pins.
The isolation and termination meet the intra-building lightning surge specification in Telcordia
GR-1089. The CAP and CAP2 have –48 VDC monitoring with an I
2
C interface and nonvolatile memory
to store the CAP/CAP2 revision information.
shows the CAP faceplate.
Figure 1-8
CAP Faceplate and Connections
If the CAP/CAP2 fails, the node raises an EQPT alarm. You can replace the CAP/CAP2 on an in-service
node without affecting traffic. To replace a CAP, refer to the
Cisco ONS 15600 SDH Procedure Guide
.
Always replace the CAP during a maintenance window.
78485
Wire
wrap
pins
LAN
RJ-45
Craft
DB-9
Audible
Alarm
DB-15
BITS
OUT
BNC
BITS
OUT
BNC
LAN
RJ-45
Craft
DB-9
BITS
IN
BNC
BITS
IN
BNC
Serial Number Label
Part Number Label
Bar Code and
Country of Origin
Labels
Backplane
connectors
Visual
Alarm
DB-15