optiPoint 410/420 FAQ (general)

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Revision as of 12:14, 16 January 2007 by Gunnar.boll (talk | contribs) (Q: Can I run an optiPoint 410/420 with local '''and''' PoE power supply =)
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Power over LAN

Q: My oP410/420 phone only supports power class 0 (default). How to setup the corresponding PoE-switch to reserve lower power?

A: Some models of the first oP410/420 phones do not support power negotiation according IEEE 802.3af. For details refer to PoE classes of optiPoint phones. To avoid that the Lan-switch reserves to much Power and cannot support PoE on all LAN ports, the LAN ports should be forced to supply a specified power class. This is normally part of the switch administration.

e.g. Settings for Cisco 3750, 3560, 2970 LAN switches Search for: Allocating Power to Devices Connected to a PoE Port

Q: Can I run an optiPoint 410/420 with local and PoE power supply

A: This is not recommended, although the phone will not break. Power class negotiation will not run properly, because the 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.