Cisco 7925G Administration Guide

802.11a
Uses the 5 GHz band that provides more channels and improved data rates by using Orthogonal
Frequency Division Multiplexing (OFDM) technology. Dynamic Frequency Selection (DFS) and
Transmit Power Control (TPC) supports this standard.
802.11b
Specifies the radio frequency (RF) of 2.4 GHz for both transmitting and receiving data at lower data
rates (1, 2, 5.5, 11 Mbps). Commonly called the Wi-Fi standard.
802.11d
Enables APs to communicate available radio channels and acceptable power levels. The Cisco Unified
Wireless IP Phone always gives precedence to 802.11d to determine which channels and powers to
use. If the information is unavailable, then the phone reverts to the locally configured regulatory domain.
802.11e
Supports Quality of Service (QoS).
802.11g
Uses the same unlicensed 2.4 GHz band as 802.11b, but extends the data rates to provide greater
performance by using OFDM technology. OFDM is a physical-layer encoding technology for transmitting
signals using RF.
802.11h
Supports the 5 GHz spectrum and transmit power management.
802.11i
Specifies security standards.
Radio Frequency Ranges
WLAN communications use the following RF ranges:
2.4 GHz
Does not require licensing. To reduce interference within this bandwidth, WLANs transmit on
non-overlapping channels, which are typically limited to three channels, although Japan uses four
channels.
Many devices operate in the 2.4 GHz bandwidth, including cordless phones and microwave ovens, and
these devices can interfere with wireless communications. Interference does not destroy the signal, but
can reduce the transmission speed from 11 Mbps to 1 Mbps. RF interference can affect voice quality
over the wireless network.
5 GHz
Divided into several sections called Unlicensed National Information Infrastructure (UNII) bands and
each section has four channels. The channels are spaced at 20 MHz to provide non-overlapping channels
and more channels than 802.11b or 802.11g.
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
25
VoIP Wireless Network
Radio Frequency Ranges

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