Cisco 7925G Deployment Guide

Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Deployment Guide
37
Note: If using Coexistence where 802.11b/g and Bluetooth are being used simultaneously, then multicast voice is not
supported.
Designing the Wireless LAN
The following network design guidelines must be followed in order to accommodate for adequate coverage, call capacity and
seamless roaming for the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G.
Planning Channel Usage
Use the following guidelines to plan channel usage for these wireless environments.
5 GHz (802.11a)
The Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G support Dynamic Frequency Selection (DFS) and
Transmit Power Control (TPC) from 802.11h, which are required when using channels operating at 5.260 - 5.700 GHz (15 of
the 23 possible channels).
DFS dynamically instructs a transmitter to switch to another channel whenever radar signal is detected. If the access point
detects radar, the radio on the access point goes on hold for at least 60 seconds while the access point passively scans for
another usable channel.
TPC allows the client and access point to exchange information, so that the client can dynamically adjust the transmit power.
The client uses only enough energy to maintain association to the access point at a given data rate. As a result, the client
contributes less to adjacent cell interference, which allows for more densely deployed, high-performance wireless LANs.
5 GHz channels overlap their adjacent channel, so there should be at least 1 channel of separation for adjacent access points.
Need to ensure there is at least 20 percent overlap with adjacent channels when deploying the Cisco Unified Wireless IP Phone
7925G, 7925G-EX, and 7926G in the 802.11a environment, which allows for seamless roaming. For critical areas, it is
recommended to increase the overlap (30% or more) to ensure that there can be at least 2 access points available with -67 dBm
or better, while the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G also meet the access point’s receiver
sensitivity (required signal level for the current data rate).

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