Cisco 3825 Hardware Installation Guide - Page 403

Chapter 39 Connecting Cisco Analog Video Gateway Network Modules Information About the EVM-IPVS-16A Network Module The RS-485 ports can be used to control camera pan, tilt, and zoom (PTZ) functions, as well as other RS-485 devices. Because PTZ camera types use different protocols, the EVM-IPVS-16A network module only supports pass-through mode. In pass-through mode PTZ commands and other data will not be interpreted. Alarm Inputs and Control Relay Outputs The EVM-IPVS-16A network module supports eight contact closure interfaces. Interfaces A0, A1, A2, and A3 can be configured as alarm input or relay output, the other interfaces are input only. They are used to detect contact trigger events and control external devices. In most cases, the contact closure interfaces will be connected to a patch panel through the two terminal block ports on the network module. The patch panel can provide the bias to the circuit. Caution The alarm signal input and output (I/O) connections on this unit are intended only for connection to NEC/CEC Class 2 or equivalent circuit. This means that the voltages applied to alarm signal I/O connections should not exceed 42.4 Vpk or 60 Vdc and it should be a limited/fused power source. For more details on Class 2 circuits, refer to the National Electrical Code/Canadian Electrical Code. Table 39-1 Alarm Input and Output Interface Specifications Specification Alarm Input Sense Voltage Range Alarm Output Current Load Range Range 12 V to 24 V 0 mA to 170 mA Gigabit Ethernet Port The external Gigabit Ethernet port is disabled by default. If you enable the Gigabit Ethernet interface, it can act as a routable interface in your network. OL-2485-20 Cisco Network Modules Hardware Installation Guide 39-3