Cisco IP Phone 7942G - Manual (Page 4)

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Cisco Unified IP Phone 7962G and 7942G Administration Guide for Cisco Unified Communications Manager 6.1(3)
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Cisco Unified IP Phone
Power Guidelines
Table 2-1 provides guidelines for powering the Cisco Unified IP Phone 7962G and 7942G.
Power Outage
Your accessibility to emergency service through the phone is dependent 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.
Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 7962G and 7942G
Power Type Guidelines
External power—Provided
through the CP-PWR-CUBE-3
external power supply. • The Cisco Unified IP Phone 7962G and 7942G use the CP-PWR-CUBE-3 power
supply.
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 Phone 7962G and 7942G support Cisco inline PoE.
• The Cisco Unified IP Phone 7962G and 7942G support IEEE 802.3af Class 2 power
on signal pairs and spare pairs.
• 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.
External power—Provided
through inline power patch
panel WS-PWR-PANEL The inline power patch panel WS-PWR-PANEL is compatible with the Cisco Unified
IP Phone 7962G and 7942G.