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Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Installation

Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G

Installation

After setting up the wireless network to support voice communications and configuring the wireless IP phones

in Cisco Unified Communications Manager, you are ready to install the phones. The following sections contain

installation information.

Phone Power

The Cisco Unified Wireless IP Phone uses a battery for power. The following table lists the types of batteries

available for the wireless IP phone and the maximum talk and standby times.

Table 3: Batteries Available for the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G

Type

Standard

Extended

Use U-APSD for talk-time power save mode. Also 5 GHz talk time is reduced up to 30 minutes for a standard

battery and up to 2 hours for an extended battery. Use of 802.11b/g and a Bluetooth headset can reduce the

talk time by 40 to 50 percent. To extend talk-time battery life, the Cisco Unified Wireless IP Phone can use

PS-POLL power save methods. The Cisco Unified Wireless IP Phone uses either U-APSD or PS-POLL when

in idle (no active phone call).

When an AP supports the Cisco Compatible Extensions (CCX) proxy ARP information element, the idle

battery life is optimized. If the AP does not support CCX or proxy ARP is not enabled, then the idle battery

life is up to 50 percent less.

The following table shows the charging time for the two types of batteries. You can stop charging the battery

when the battery is fully charged. Lithium ion batteries can be partially charged without shortening the battery

life. Batteries should handle up to 4000 recharges.

Battery life varies because of environmental factors and Bluetooth use.

Note

Table 4: Battery Charging Time

Battery type

Standard

Extended

Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide

Technology

Talk time

Lithium ion (Li-ion)

Up to 9.5 hrs

Li-ion

Up to 13 hrs

Power supply connected to phone

2 hours

3 hours

Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Setup

Standby time

Up to 180 hrs

Up to 240 hrs

Phone connected to PC and USB cable

5 hours

7 hours