optiPoint 410/420 FAQ (general)

The Wiki of Unify contains information on clients and devices, communications systems and unified communications. - Unify GmbH & Co. KG is a Trademark Licensee of Siemens AG.

Revision as of 11:12, 17 January 2007 by Davide.poletto (talk | contribs) (Some text revised)
Jump to: navigation, search

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 first hardware models of the optiPoint 410/420 phones did not support power negotiation according 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 support PoE feature on all its LAN ports, the LAN ports should be forced to supply a specified power class. This is normally part of the switch configuration and 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 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.