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optiPoint 410/420 FAQ (general)

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Revision as of 12:11, 17 January 2007 by Davide.poletto (talk | contribs) (Q: My optiPoint 410/420 phone only supports power class 0 (default). How to setup the corresponding PoE compliant switch to reserve lower power ?: Some text adapted, added Huawei link.)
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Power over LAN

Q: My optiPoint 410/420 phone only supports power class 0 (default). How to setup the corresponding PoE compliant switch to reserve lower power ?

A: Some earlier hardware models of the optiPoint 410/420 phones did not support power negotiation feature according to the IEEE 802.3af standard. For details refer to the tables available on the PoE classes of optiPoint phones page. To avoid that the LAN switch reserves to much Power and thus cannot feeds PoE power supply on all its LAN Ethernet ports, each LAN ports should be forced to supply a specified Power Class. This is normally part of each Ethernet LAN Switch configuration / administration and should be specifically evaluated product by product.

e.g. See also Release Notes for the CISCO Catalyst 3750/3560 and 2970 LAN Switches.

Text search: Allocating Power to Devices Connected to a PoE Port.

e.g. See also Huawei Technical Support and Documentation website (Registration and Login are required) for Quidway S-series Ethernet LAN Switches ports PoE configurations / operations.

Text search: Remote Power Feeding Configurations or 802.3af+Quidway.

Q: Can I run an optiPoint 410/420 with both local and PoE Power Supply at the same time ?

A: This practice is not recommended, although the phone will not break. Power class negotiation will not run properly, because the IEEE802.3af standard requires a power-less state for the negotiation (no local power supply). Thus in this case the class will be set to 0 (default). If the power negotiation is done first and then the local power supply is connected, the initial negotiated power class will not be changed.