Cisco 7931G Phone Guide

6 OL-12546-01
Cisco Systems recommends the use of good quality external devices, like headsets that are screened
against unwanted radio frequency (RF) and audio frequency (AF) signals. Depending on the quality of
these devices and their proximity to other devices such as cell phones and two-way radios, some audio
noise may still occur. See Audio Quality Subjective to the User, page 6, for more information.
The primary reason that support of a headset would be inappropriate for the Cisco Unified IP Phone
is the potential for an audible hum. This hum can either be heard by the remote party or by both the
remote party and you, the Cisco Unified IP Phone user. Some potential humming or buzzing sounds
can be caused by a range of outside sources, for example, electric lights, being near electric motors,
large PC monitors. In some cases, a hum experienced by a user may be reduced or eliminated by using
a local power cube or power injector.
Audio Quality Subjective to the User
Beyond the physical, mechanical and technical performance, the audio portion of a headset must
sound good to you (the user) and to the party on the far end. Sound is subjective and Cisco cannot
guarantee the performance of any headsets or handsets, but some of the headsets and handsets on the
sites listed below have been reported to perform well with Cisco Unified IP Phones.
Nevertheless, it is ultimately still the customer’s responsibility to test this equipment in their own
environment to determine suitable performance.
For information about headsets, see:
http://www.vxicorp.com/cisco
http://www.plantronics.com/cisco
http://www.jabra.com
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Cisco 7931G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Wall mountable	Yes
Electromagnetic compatibility	FCC Part 15 (CFR 47) Class B, ICES-003 Class B, EN55022 Class B, CISPR22 Class B, AS/NZS CISPR 22 Class B, CISPR 24, VCCI Class B, EN55024, EN 50082-1, EN 61000-3-2, EN 61000-3-3, EN 61000-6-1
Wi-Fi	No
Networking standards	IEEE 802.1Q, IEEE 802.1af, IEEE 802.1p
Ethernet LAN interface type	Fast Ethernet
Supported network protocols	DHCP, TFTP, CDP
Lines quantity	24 lines
Phonebook capacity	- entries
Number of VoIP accounts	-
Voice codecs	G.711a, G.729A, G.729B, G.729ab
Volume control	Digital
Display resolution	192 x 64 pixels
Display number of lines	3 lines
Display number of colors	Monochrome
Storage temperature (T-T)	-10 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Safety	(UL) 60950, (CSA) C22.2 No. 60950, EN 60950, IEC 60950, AS/NZS60950, TS 001
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	229 mm
Width	203 mm
Height	178 mm
Weight	1360 g