PoE StabilityNEW!

APs commonly receive power through an Ethernet backhaul cable connection to an upstream switch. This method is known as Power over Ethernet or PoE. When an AP boots, it selects a power mode based on the available PoE protocols. The AP can start with PoE and move to PoE+ after a brief interval. It uses the selected power mode until it reboots.

Table 1. PoE Standards
Standard Description
PoE (AF) IEEE 802.3af
PoE+ (AT) IEEE 802.3at
PoE++ (BT) IEEE 802.3bt

PoE stability anomalies are related to sudden changes in power draw. Data is presented over a 48-hour period, and includes date and time details. When an AP negotiates down to AF, even though it requires AT or a higher level for optimal performance and full capacity, CoPilot reports a PoE anomaly.

The severity definitions for PoE anomalies are based on the average number of clients connected to an AP on a given day. If there are fewer than 10 clients, the anomaly severity is considered low. If there are 50 or more clients on a given day, the severity level is considered high. If there are between 10 and 50 clients, the severity level is considered medium.

Occasionally, poorly installed cabling or MDU closet wiring, lack of power on the upstream switch, or a failing power supply on either the AP or the switch might cause APs to cycle through power modes, while never reaching a steady state.

To open the PoE Stability Anomaly panel, select a location (site), for which anomalies have been detected, from the table. To view more information about an anomaly, select the corresponding down arrow. The PoE Stability Anomaly panel includes the following information:

This section provides general information about the anomaly.
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PoE Stability Anomaly Header
the header.

The Current PoE Mode shows whether the affected device is online and the current power mode—AF, AT or BT. If the AP is offline, the status is Disconnected.


This section provides a description of the problem, including the actual PoE mode and the desired PoE mode.

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This section describes the effect the anomaly has on the system, for example: Lower coverage and performance in the coverage area

This section provides steps to resolve the anomaly, for example:

  1. Verify whether there is sufficient PoE budget on the upstream switch.
  2. Verify that the network cable length is not beyond 100 meters (328 feet), is properly connected to the AP, and that the cable does not have any signs of damage.
PoE Trend

The PoE Trend graph shows the pattern of changes in PoE mode for the last seven days. To view the graph, select the down arrow.

The graph indicates the three power modes: AF, AT and BT Type 3. Red indicates a low power mode.

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PoE Trend
PoE Trend graph