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Understanding PoE on ACX Series Universal Access Routers
Power over Ethernet (PoE) is the implementation of the IEEE 802.3af and IEEE 802.3at standards that allows both data and electrical power to pass over a copper Ethernet LAN cable.
Juniper Networks provides PoE on ACX2000 Universal Access Routers that allows power delivery up to 65 W per PoE port. PoE ports transfer electrical power and data to remote devices over standard twisted-pair cables in an Ethernet network. Using PoE ports, you can plug in devices that require both network connectivity and electrical power, such as voice over IP (VoIP) and wireless LAN access points.
You can configure the ACX2000 Universal Access Router to act as a power sourcing equipment (PSE), supplying power to powered devices that are connected on designated ports.
This topic contains the following sections: :
ACX2000 PoE Specifications
Table 1 lists the PoE specifications for the ACX2000 routers.
Table 1: PoE Specifications for the ACX2000 Routers
Specifications | For ACX2000 Universal Access Routers |
|---|---|
Supported standards |
|
Supported ports | Supported on only two Gigabit Ethernet ports (ge-0/1/3 and ge-0/1/7). |
Total PoE power sourcing capacity | 130 W |
Default per port power limit | 32 W |
Maximum per port power limit | 65 W |
Power management modes |
|
PoE Classes and Power Ratings
A powered device is classified based on the maximum power that it draws across all input voltages and operational modes. When class-based power management mode is configured on the ACX2000 routers, power is allocated taking into account the maximum power ratings defined for the different classes of devices.
Table 2 lists the classes and their power ratings as specified by the IEEE standards.
Table 2: ACX2000 Universal Access Router PoE Specifications
Class | Usage | Minimum Power Levels Output from PoE Port |
|---|---|---|
0 | Default | 15.4 W |
1 | Optional | 4.0 W |
2 | Optional | 7.0 W |
3 | Optional | 15.4 W |
4 | Reserved | Class 4 power devices are eligible to receive power up to 30 W according to the IEEE standards. |
PoE Options
For ACX2000 Universal Access Routers that support PoE ports, the factory default configuration enables PoE on the PoE-capable ports, with default settings in effect. You might not have to do any additional configuration if the default settings work for you. Table 3 shows the PoE configuration options and their default settings for the PoE controller and for the PoE interfaces.
Table 3: PoE Configuration Options and Default Settings
Option | Default | Description |
|---|---|---|
PoE Controller Options | ||
0 W | Reserves up to 19 W power from the PoE power budget to be used in the case of a spike in PoE power consumption. | |
static | Sets the PoE power management mode for the router. The power management mode determines how power to a PoE interface is allocated:
| |
Interface Options | ||
Not included in default configuration | When included in the configuration, disables PoE on the interface. The interface maintains network connectivity but no longer supplies power to a connected powered device. Power is not allocated to the interface. | |
low | Sets an interface’s power priority to either low or high. If power is insufficient for all PoE interfaces, the PoE power to low-priority interfaces is shut down before power to high-priority interfaces is shut down. Among interfaces that have the same assigned priority, the power priority is determined by port number, with lower-numbered ports having higher priority. | |
Not included in default configuration | When included in the configuration, enables the logging of power consumption records on an interface. Logging occurs every 5 minutes for 1 hour unless you specify a different value for interval (Power over Ethernet) or duration. | |
