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Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
OL-23089-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
Power Guidelines
Table 2-1 provides guidelines that apply to external power and to PoE power for the Cisco Unified IP
Phones 7931G.
Obtaining Additional Information about Power
For related information about power, refer to these documents:
• Cisco Catalyst Switches—Cisco switches that work with the Cisco Unified IP Phones:
http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.htm
l
• Cisco IOS Software—Cisco IOS releases that support bidirectional power negotiation:
http://www.cisco.com/en/US/products/sw/iosswrel/products_ios_cisco_ios_software_category_ho
me.html
• Other requirements and restrictions regarding power:
–
Cisco Unified IP Phone Power Injector Installation Guide
–
Power Over Ethernet Solutions—Introduction
–
Integrated Service Routers:
http://www.cisco.com/en/US/products/hw/routers/index.html
Table 2-1 Guidelines for Powering the Cisco Unified IP Phones 7931G
Power Type Guidelines
External power—
Provided through a Cisco
external power supply.
The CP-PWR-CUBE-3 external power supply may be used with the
Cisco Unified IP Phones 7931G.
External power—Provided
through the Cisco Unified
IP Phone Power Injector.
The Cisco Unified IP Phone Power Injector may be used with any
Cisco Unified IP Phone. Functioning as a midspan device, the injector
delivers inline power to the attached phone. The Cisco Unified IP Phone
Power Injector is connected between a switch port and the IP Phone, and
supports a maximum cable length of 100m between the unpowered switch
and the phone.
PoE power—Provided by
a switch through the
Ethernet cable attached to
the phone.
• The Cisco Unified IP Phones 7931G supports IEEE 802.3af Power
over Ethernet.
• To ensure uninterruptible operation of the phone, make sure that the
switch has a backup power supply.
• Make sure that the CatOS or IOS version running on your switch
supports your intended phone deployment. Refer to the
documentation for your switch for operating system version
information.