Cisco 7975G Administration Guide

2-5
Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.0
OL-12642-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Phone Configuration Files
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.
Obtaining Additional Information about Power
For related information about power, refer to the documents shown in Table 2-3. These documents
provide information about these topics:
• Cisco switches that work with the Cisco Unified IP Phone 7975G
• The Cisco IOS releases that support bidirectional power negotiation
• Other requirements and restrictions regarding power
Table 2-3 Related Documentation for Power
Document Topics URL
Cisco Unified IP Phone Power Injector http://http://www.cisco.com/en/US/pr
oducts/ps6951/index.html
PoE Solutions http://www.cisco.com/en/US/netsol/
ns340/ns394/ns147/ns412/networking
_solutions_package.html
Cisco Catalyst Switches http://www.cisco.com/univercd/cc/td/
doc/product/lan/index.htm
Integrated Service Routers http://www.cisco.com/en/US/products
/hw/routers/index.html
Cisco IOS Software http://www.cisco.com/en/US/products
/sw/iosswrel/products_ios_cisco_ios_
software_category_home.html
Understanding Phone Configuration Files
Configuration files for a phone are stored on the TFTP server and define parameters for connecting to
Cisco Unified
Communications Manager. In general, any time you make a change in Cisco
Unified
Communications Manager that requires the phone to be reset, a change is made to the phone’s
configuration file automatically.
Configuration files also contain information about which image load the phone should be running. If this
image load differs from the one that is currently loaded on a phone, the phone contacts the TFTP server
to request the required load files. (These files are digitally signed to ensure the authenticity of the file
source.)
In addition, if the device security mode in the configuration file is set to Authenticated and the CTL file
on the phone has a valid certificate for Cisco
Unified Communications Manager, the phone establishes
a TLS connection to Cisco
Unified Communications Manager. Otherwise, the phone establishes a TCP

Cisco 7975G Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Grey, Silver
Speakerphone	Yes
Voice codecs	G.711Mu, G.711a, G.722, G.729A, iLBC
Number of melodies	24
Aspect ratio	4:3
Display diagonal	5.6 \
Display resolution	320 x 240 pixels
Lines quantity	8 lines
Phonebook capacity	- entries
Number of VoIP accounts	-
Front camera	No
Security algorithms	128-bit AES
Networking standards	IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	DHCP, TFTP
Volume control	Digital
Headphone outputs	1
Ethernet LAN (RJ-45) ports	2
Number of handles included	1 pc(s)
AC adapter output voltage	48 V
Storage temperature (T-T)	-10 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Certification	FCC

Weight and Dimensions

Depth	152.4 mm
Width	266.7 mm
Height	203.2 mm
Weight	1600 g