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Figure 1. Power via MDI TLV packet format
The fields of Power via MDI TLV are described as follows:
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Field | Functions | Description |
|---|---|---|
0 | Port type | 1: PSE-side port 0: PD-side port |
1 | Whether the PSE supports MDI power supply. | 1: indicates that the PSE supports MDI power supply. 0: indicates that the PSE does not support MDI power supply. |
2 | MDI power supply status of the PSE. | 1: enabled 0: disabled |
3 | Whether the PSE can control the line pair. | 1: indicates that the PSE can control the line pair. 0: indicates that the PSE cannot control the line pair. |
4-7 | Reserved. | - |
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- PSE power Pair: The PSE power pair field contains an integer value as defined by the pethPsePortPowerPairs object in IETF RFC 3621.
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Field | Functions | Description |
|---|---|---|
Priority | Power supply priority of an interface. | 11: indicates the lowest priority. 10: indicates the secondary highest priority. 01: indicates the highest priority. NOTE: This field contains four bits. The two left-most bits are reserved for the system. |
Source
| Power supply source. | PD:
PSE:
|
Type
| Power supply type. | 01: indicates the PD that supports IEEE 802.3at. 00: indicates the PSE that supports IEEE 802.3at. 11: reserved. 10: reserved. |
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Field | Functions | Value/Meaning |
|---|---|---|
PSE allocated | PSE allocated power value |
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PoE over LLDP Power Negotiation Mechanism
If PoE over LLDP power negotiation function is enabled on PSE, the PSE and the PD will periodically send LLDP packets to each other to perform LLDP power negotiation once the PD device is detected by the PSE. PoE over LLDP power negotiation starts when PSE receives LLDP packets from PD.
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