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
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.