Power over Ethernet (PoE) is supported only on the 7210 SAS-Mxp ETR, 7210 SAS-Sx/S 1/10GE operating in standalone mode, and 7210 SAS-T ETR.
The 7210 SAS-Mxp ETR, 7210 SAS-Sx/S 1/10GE PoE variants, and 7210 SAS-T ETR support PoE in accordance with the 802.3af and 802.3at standards. This feature allows these platforms to supply power to connected PoE devices, such as telephones, CCTV cameras, and other PoE standard compliant devices.
The 7210 SAS-Sx 1/10GE supports two PoE variants:
24Tp 4SFP+ PoE
48Tp 4SFP+ PoE
In addition to the PoE variants, the following 7210 SAS-Sx 1/10GE fiber variants support two PoE/PoE+ ports:
22F 2C 4SFP+
46F 2C 4SFP+
The 7210 SAS-S 1/10GE supports two PoE variants:
24Tp 4SFP+ AC PoE
48Tp 4SFP+ AC PoE
The following PoE functionalities are available:
The 7210 SAS supports both 802.3af (PoE) and 802.3at (PoE+) on all ports. The ports can be used to connect either PoE or PoE+ devices, or a combination of both simultaneously, as long as the power drawn is within the device system limits.
Only Alternative A, as described in the 802.3af and 802.3at standards, is supported on the 7210 SAS.
The 7210 SAS supports classification of both Type 1 and Type 2 PoE devices (PDs) using the physical layer classification mechanism (using the 1-event physical layer classification mechanism for Type 1 PD and 2-event physical layer classification mechanism for Type 2 PD).
The 7210 SAS supports the class-based power allocation method, which allocates power based on the identified class using a physical layer classification mechanism. The 802.3af and 802.3at standards define the power that can be allocated or requested by a particular class. The standards define four classes: Class 1, Class 2, Class 3, and Class 4. These classes are used to allow PoE devices to request power based on their needs. If there is not enough power available to supply the identified class, power is denied to the connected PoE device. Each 7210 SAS device has a limit on the maximum amount of power it can provide. If the total power requested by the PDs connected to PoE-enabled ports exceeds this threshold, the 7210 SAS device denies power to the other PD. When power is denied to the PD, the port is operationally up, even though power is not supplied to the port. If power is applied successfully or denied to the port, the system logs an event.
Only DC power is supplied to connected PDs. It is supported for PDs that use injectors where an AC/DC wall device is used to power a remote PoE device.
The software monitors the PoE port, detects faults and events, and raises traps. The software displays this information in the status report. The following events and faults are detected and notify the user:
supplying power event
This event is generated when power is supplied to a connected PoE device after successful detection and classification.
denied power event
This event is generated when power is denied to a connected PoE device after successful detection and classification.
disconnect event
This event is generated when a connected PoE device is disconnected from the port and stops drawing power from the node.
fault events
These events are generated for overload, short-circuit, and other events. Software clears the fault when the fault no longer exists.
If a port enabled for PoE is shut down, the power supplied to the port is disabled. It restores power when the no shutdown command is executed, if the request does not exceed the power budget.