Power Negotiation Over Lldp - Cisco 8811 Administration Manual

Network Protocols
Power Save Plus (EnergyWise)

Power Negotiation Over LLDP

The phone and the switch negotiate the power that the phone consumes. Cisco IP Phone operates at multiple
power settings, which lowers power consumption when less power is available.
After a phone reboots, the switch locks to one protocol (CDP or LLDP) for power negotiation. The switch
locks to the first protocol (containing a power Threshold Limit Value [TLV]) that the phone transmits. If the
system administrator disables that protocol on the phone, the phone cannot power up any accessories because
the switch does not respond to power requests in the other protocol.
Cisco recommends that Power Negotiation always be enabled (default) when connecting to a switch that
supports power negotiation.
If Power Negotiation is disabled, the switch may disconnect power to the phone. If the switch does not support
power negotiation, disable the Power Negotiation feature before you power up accessories over PoE. When
the Power Negotiation feature is disabled, the phone can power the accessories up to the maximum that the
IEEE 802.3af-2003 standard allows.
When CDP and Power Negotiation are disabled, the phone can power the accessories up to 15.4W.
Note
Network Protocols
Cisco IP Phone 8800 Series support several industry-standard and Cisco network protocols required for voice
communication. The following table provides an overview of the network protocols that the phones support.
Table 10: Supported Network Protocols on the Cisco IP Phone 8800 Series
Network protocol
Bluetooth
Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager
12
The Cisco IP Phone supports Cisco EnergyWise (Power Save Plus) mode. When your network contains
an EnergyWise (EW) controller (for example, a Cisco switch with the EnergyWise feature enabled),
you can configure these phones to sleep (power down) and wake (power up) on a schedule to further
reduce power consumption.
Set up each phone to enable or disable the EnergyWise settings. If EnergyWise is enabled, configure
a sleep and wake time, as well as other parameters. These parameters are sent to the phone as part of
the phone configuration XML file.
Purpose
Bluetooth is a wireless personal area network (WPAN)
protocol that specifies how devices communicate over short
distances.
Usage notes
Cisco IP Phones 8845, 8865, and
8851 support Bluetooth 4.1.
Cisco IP Phone 8861 support
Bluetooth 4.0.
Cisco IP Phone 8811, 8841,
8851NR, and 8865NR do not
support Bluetooth.