Electrical Characteristics; Central Office Alarm Wiring Example - Cisco ASR 5000 Series Installation Manual

Cabling the Switch Processor Input/Output Line Card

Electrical Characteristics

Each of the three dry-contact relay switches is rated to support a maximum switching current of 1A@30VDC. The relay
contacts should not directly connected to high current devices such as sirens and flashing lamps.
Important:
or cabling only. This interface MUST NOT be metallically connected to interfaces that connect to the outside plant
(OSP) or its wiring. This interface is designed for use as an intra-building interface only (Type 2 or Type 4 ports as
described in GR-1089-CORE, Issue 5) and requires isolation from the exposed OSP cabling. The addition of Primary
Protectors is not sufficient protection in order to connect these interfaces metallically to OSP wiring.

Central Office Alarm Wiring Example

The following figure depicts how the dry-contact relays can each control up to two external alarm indicators. In this
example, the CO alarm interface is connected to a CO Alarm Panel, where green LEDs are wired to indicate normal
operation, and red LEDs are wired to indicate an alarm condition.
Figure 40.
With all relays de-energized (normally closed), the green LED is illuminated. If an alarm relay is energized, the NO
(normally open) contact closes and the red LED is illuminated.
The CO alarm interface of the SPIO is suitable for connection to intra-building or unexposed wiring
CO Alarm Interface Schematic
Connecting to the CO Alarm Interface ▀
ASR 5000 Installation Guide ▄
121