Cisco Systems CGS 2520 manual Power-Input Terminal, Alarm Ports, Alarm Input, Alarm Output

Chapter 1 Product Overview

Ports

You can order this cable (part number CAB-SFP-50CM=).

Power-Input Terminal

The power-input terminal provides screw terminals for the AC and DC power connections. The switch can operate with one or two power supplies. If one of the power sources fail, the other continues to power the switch. For more information, see the “Power Supply Installation” section on page 3-1.

Figure 1-4 Power-Input Terminal

Cisco CGS 2520

207234

Alarm Ports

The switch has four alarm inputs and one alarm output. The alarm setting is open or closed.

•Open means that the normal condition has current flowing through the contact (referred to as a normally closed contact). The alarm is generated when the current stops.

•Closed means that no current flows through the contact (referred to as a normally open contact). The alarm is generated when the current flows.

This section contains the following alarm port information:

•Alarm Input, page 1-7

•Alarm Output, page 1-7

Alarm Input

The alarm input is a dry-contact alarm port. You can connect up to four alarm inputs from devices, such as a door, a temperature gauge, or a fire alarm, to the alarm port. You can use the CLI to set the alarm severity to minor, major, or critical. An alarm generates a system message and turns on an LED. See the “Alarm LEDs” section on page 1-10for the LED descriptions.

Alarm Output

The alarm output can be configured as a minor or major alarm. Output alarms often control an external alarm, such as a bell or a light. To connect an external alarm device to the relay, connect two relay contact wires to complete the electrical circuit. See the “Alarm Port” section on page B-3for information on the alarm pinouts.

Cisco CGS 2520 Hardware Installation Guide

OL-31444-01 1-7