Cisco 7925G Administration Guide

The following figure shows a typical WLAN topology that enables the wireless transmission of voice for
wireless IP telephony.
Figure 2: WLAN with Cisco Unified Wireless IP Phones
When a wireless IP phone powers up, it searches for and becomes associated with an AP. As users move from
one location to another, the wireless IP phone roams out of range of one AP into the range of another AP.
The wireless IP phone builds and maintains a list of eligible APs and reconnects to an AP in that list. See AP
Association, on page 34 for more information.
The AP uses its connection to the wired network to transmit data and voice packets to and from the switches
and routers. Voice signaling transmits to the Cisco Unified Communications Manager server for call processing
and routing. APs are critical components in a WLAN because they provide the wireless links or “hot spots”
to the network.
Each AP has a wired connection to an Ethernet switch, such as a Cisco Catalyst 3750 Series, that is configured
on a LAN. The switch provides access to gateways and the Cisco Unified Communications Manager server
to support wireless IP telephony.
For more information on WLANs, APs (including supported models), antennas, and wireless IP telephony,
see Cisco Unified Wireless IP Phone 7925 and 7926 Series Deployment Guide at http://www.cisco.com/en/
US/products/hw/phones/ps379/products_implementation_design_guides_list.html.
WLAN Standards and Technologies
This section describes WLAN standards and technologies.
802.11 Standards for WLAN Communications
Wireless LANs must follow the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards that
define the protocols that govern all Ethernet-based wireless traffic. The Cisco Unified Wireless IP Phone
supports the following standards:
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
24
VoIP Wireless Network
WLAN Standards and Technologies

Cisco 7925G Specifications

General

Keypad number of keys	12
Display diagonal	2 \
Display resolution	176 x 220 pixels
Call waiting	Yes
Lines quantity	6 lines
Voice codecs	G.711a, G.722, G.729a, iLBC
Security algorithms	128-bit WEP, SSL/TLS, WPA
Supported network protocols	DHCP, TFTP, DNS, SCCP, SRST
Input voltage	100 - 240 V
Dimensions (WxDxH)	52 x 20 x 127 mm
Minimum system requirements	Cisco Unified Communications Manager 4.1, 4.2, 4.3, 5.1, 6.0, 6.1, 7.0 + Cisco Unified Communications Manager Express 4.3 +
Input frequency	50/60 Hz
Storage temperature (T-T)	-30 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Product type	IP Phone
Product color	Gray
Safety	UL 60950, CSA 22.2 No.60950, EN 60950, IEC 60950, AS/NZS 60950, IEC 60529 (IP 54)
Certification	47 CFR 15 B ICES-003 B EN 55022 B AS/NZS CISPR 22 B CISPR 22 B VCCI B EN 61000-3-2 EN 61000-3-3 KN 22 EN 55024 EN 50082-1 EN 61000-6-1 EN 300386 EN 60601-1-2 KN
Compliance industry standards	IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.1X, IEEE 802.11e

Weight and Dimensions

Weight	138 g