ENA Power over Ethernet (PoE) supports PoE Midspan Injectors.
PoE Midspan Injectors
ENA PoE allows the management of Microsemi PoE midspan injector devices, with SNMP polling of port configuration and power supply status.
Overview of Microsemi PoE Midspan Injectors
Microsemi (formerly PowerDsine) manufacture a range of Power over Ethernet (PoE) midspan injector devices with various port densities. These devices allow power to be injected into Ethernet circuits close to the end-device that actually consumes the power.
Each unit has a network connection that is used to communicate with the SNMP agent and webserver. The power is injected via separate ports that are not instrumented for traffic monitoring.
The use of these midspan power injectors avoids the need for installing PoE hardware modules into the access layer Ethernet switches.
ENA PoE implementation
Midspan injector devices are IP addressable and have an SNMP agent that allows management access. ENA discovers and adds PoE midspan injectors to its database in a similar manner to that used for routers and Ethernet switches. PoE midspan injector devices are automatically classified as midspan injector devices and placed into their own Devices folder.
ENA PoE monitors the status of the power supply and the individual port configuration, status and power drain through the injector devices.
Each device includes an in-built webserver, which allows browser access to status and configuration settings. ENA PoE includes a user action for the context launching of a web browser.
ENA PoE injector devices
ENA PoE considers midspan injectors as devices, and as such they are placed within a subfolder of devices. Many of the midspan injector attributes are standard attributes applicable to other device types, e.g. Ports, Chassis Data and KPI tabs. This section outlines attributes of particular interest or specific to PoE management:
PoE injector attributes
|Manufacturer||manufacturer name, derived by matching the manufacturer number against the first 2500 Private Enterprise Codes compiled by the Internet Assigned Numbers Authority (http://www.iana.org/assignments/enterprise-numbers). Where the manufacturer code is not matched, then the first part of the device name is taken - usually this is the manufacturer’s name. This would be Microsemi or, as it was formerly called, PowerDsine.|
|Version||device version number.|
|Serial Number||device serial number.|
|Polled IP Address||IP address that ENA uses to poll the device.|
|System Object Identifier||value of the system object identifier MIB for the device.|
|System Description||manufacturer's device description, which may include the application and boot version identifiers.|
|Power Budget||percentage of maximum available power when operating from a UPS.|
|Maximum Power||maximum power available to the device, measured in watts.|
|System Capabilities||traffic management capabilities of the device. It is not applicable to this device type.|
|Nominal Power||theoretical level of power available to the device, measured in watts.|
|Poll Status||indicates whether the device is currently available to poll.|
PoE injector stream attributes
PoE midspan injectors supply power to network devices through their injector ports. You can monitor power supply at both the injector device and injector port level. ENA PoE can detail PoE injector device power configuration.
|Operational Status||operational status of the device, i.e. On, Off.|
|Total Power Supplied||sum of all power supplied to the device's ports.|
|Voltage||mains power supply received by the PoE midspan injector.|
PoE injector port attributes
PoE injector ports inject power into the end device, and so are not instrumented for traffic monitoring.
|Maximum Power||maximum power the port can handle, measured in watts.|
|Device Classification||power class of the powered device (PD).|
|Power Priority||Priority of the port used to decide which ports continue to supply full power to their end device, when power to midspan injector is insufficient to meet all requirements. Three states area available: Critical, High and Low (default).|
|Port Description||Description which can be used to identify the end device, or its purpose, that this port is supplying with power.|
PoE injector port stream attributes
PoE injector ports inject power into the end device and so are not instrumented for traffic monitoring. ENA PoE can detail the status of their power delivery, updating these values using a one hour polling cycle. This information is available for graphing through the Attribute Grapher, for reporting on through Flex Reports.
|Power Supplied||power that the port is currently delivering, measured in watts.|
|Administrative Status||port can be administratively Enabled or Disabled.|
|Detection Status||status of the port power detection, i.e. Disabled, Searching, Delivering Power, Fault, Test, Other Fault, Unknown.|