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 6: Supported Network Protocols on the Cisco IP Phone 8800 Series
Usage notesPurposeNetwork protocol
Cisco IP Phones 8845, 8865, and 8851
support Bluetooth 4.1.
Cisco IP Phone 8861 support Bluetooth 4.0.
Cisco IP Phone 8811 and 8841 do not
support Bluetooth.
Bluetooth is a wireless personal area
network (WPAN) protocol that specifies
how devices communicate over short
distances.
Bluetooth
—BootP enables a network device, such as
the Cisco IP Phone, to discover certain
startup information, such as the IP address.
Bootstrap Protocol (BootP)
The Cisco IP Phones use CDP to
communicate information such as auxiliary
VLAN ID, per port power management
details, and Quality of Service (QoS)
configuration information with the Cisco
Catalyst switch.
CDP is a device-discovery protocol that
runs on all Cisco-manufactured equipment.
Using CDP, a device can advertise its
existence to other devices and receive
information about other devices in the
network.
Cisco Discovery Protocol (CDP)
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
18
About the Cisco IP Phone
Network Protocols
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