Chapter 1 Product Overview
Cisco ONS 15540 ESPx Chassis
1-6
Cisco ONS 15540 ESPx Hardware Installation Guide
78-16436-01
A processor card energizes the relays by driving 3.3 volts to them. Only the
primary processor card drives the relays, however, each processor card can tell if
the relay is energized by sensing that the feedback line is grounded through the
second contact.
lists the specifications for the alarm cards on the
Cisco ONS 15540 ESPx.
Table 1-1
Alarm Card Specifications
Connector
Type
Level
Pin
Contact
Notes
P1
Visible
Minor
1
C
1
1.
C = center
Each type and level of alarm is
signaled by a contact closure of
C to NO and an open from C to
NC.
Voltage at contacts is limited to
48 VDC.
Switched current / load is limited
to 1 A resistive.
Alarms are signaled when the
chassis is unpowered.
2
NC
2
2.
NC = normally closed
3
NO
3
3.
NO = normally open
Major
4
C
5
NC
6
NO
Critical
7
C
8
NC
9
NO
P2
Audible
Minor
1
C
2
NC
3
NO
Major
4
C
5
NC
6
NO
Critical
7
C
8
NC
9
NO
