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Description:
This article describes the process of the PoE negotiation via LLDP between an access point with LCOS LX and a switch from a third party manufacturer with PoE support for 802.3at (max. 30 W).
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Depending on the switch manufacturer, the LLDP negotiation may turn out differently. |
Requirements:
- LCOS LX as of version 6.14 RU1 (download latest version)
- LLDP dot3 must be active on the switch ports, as LCOS LX only supports tis option. LLDP-Med cannot be used for the negotiation.
PoE negotiation via LLDP with 802.3at support and a maximum power requirement of 30 Watt:
As an example, the PoE negotiation process via LLDP between an LX-6400 (power requirement of 25,5 W) and a Cisco switch with 802.3at Support and a maximum power requirement of 30 W is shown below. Therefore the switch can completely fullfill the power requirement.
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5) Afterwards, the access point and the switch exchange LLDP packets for keepalive in intervals of two (access point) or three seconds (switch).
PoE negotiation via LLDP with 802.3at support and maximum power requirement of 60 Watt:
As an example, the PoE negotiation process via LLDP between an LX-6500 (power requirement of 51 W) and a Cisco switch with 802.3at support and a maximum power requirement of 60 W is shown below. Therefore, the switch cannot fullfill the power requirement.
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2) The access point requests 51 W, which is required for full operation (PD Requested Power Value 51.0 Watt). At this point, the access point has not yet adopted the 13 W allocated by the switch (PSE Allocated Power Value).
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3) The switch still only allocates 13 W to the access point, as the requested value of 51 W is invalid.
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In this case, in the webinterface of the Cisco switch the Powerclass is shown as Unknown. |
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