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Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
OL-23091-01
Chapter 2 Preparing to Install the Cisco Unified IP Phones on Your Network
Providing Power to the Cisco Unified IP Phones
Power Guidelines
Table 2-1 provides guidelines for powering the Cisco Unified IP Phones.
Power Outage
Telephone emergency service access depends on the phone being powered. If there is an interruption in
the power supply, Service and Emergency Calling Service dialing will not function until power is
restored. In the case of a power failure or disruption, you may need to reset or reconfigure equipment
before using the Service or Emergency Calling Service dialing.
Ta b l e 2-1 Guidelines for Powering the Cisco Unified IP Phones
Power Type Guidelines
External power—Provided
through the CP-PWR-CUBE-3
external power supply.
• The Cisco Unified IP Phones 7962G, 7942G, 7961G, and 7941G use the
CP-PWR-CUBE-3 power supply.
• The Cisco Unified IP Phones 7961G-GE and 7941G-GE use the CP-PWR-CUBE-3
external power supply only.
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 IP Phone.
PoE power—Provided by a
switch through the Ethernet
cable attached to the phone.
• The Cisco Unified IP Phones 7962G, 7942G, 7961G, and 7941G support Cisco inline
PoE, but the Cisco Unified IP Phones 7961G-GE, and 7941G-GE do not.
• The Cisco Unified IP Phones 7962G and 7942G support IEEE 802.3af Class 2 power
on signal pairs and spare pairs. The Cisco Unified IP Phones 7961G-GE, and
7941G-GE are not compatible with Cisco switches that are not IEEE compliant.
• 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.