Cisco 7925G Administration Guide - Page 16

Bluetooth Technology Chapter 1 Overview of the Cisco Unified Wireless IP Phone 7925G • Dust resistance • Shock proof and vibration proof • USB 1.1 interface Bluetooth Technology The Cisco Unified Wireless IP Phone 7925G is a full-feature telephone and a qualified Bluetooth wireless device (Qualified Device ID (QDID) B014396). In addition to basic call-handling features, your phone operates with Bluetooth wireless headsets, including certain handsfree call features. Bluetooth devices operate in the unlicensed Industrial Scientific Medicine (ISM) band of 2.4GHz. This unlicensed band in most countries includes the frequency range from 2400 to 2483.5 MHz. Synchronous voice channels are provided by using circuit switching and asynchronous data channels are provided by using packet switching. Bluetooth uses an integrated Adaptive Frequency Hopping (AFH) to avoid interference. Every 625 usec (1/1,000,000 of a second) the channel changes or hops to another frequency within the 2402 to 2480 MHz range. This computes to 1600 hops every second. On the Cisco Unified Wireless IP Phone 7925G, a Bluetooth module and 802.11 WLAN module co-exist in the phone. This co-existence greatly reduces and avoids radio interference between the Bluetooth and 802.11bg radio. Bluetooth devices fit into to three different power classes, as shown in Table 1-1. Table 1-1 Class Class 1 Class 2 Class 3 Bluetooth Maximum Permitted Power and Range by Class Maximum Permitted Power (dBm) Maximum Permitted Power (mW) Range 100 mW 20 dBm Up to 100 meters 2.5 mW 4 dBm Up to 10 meters 1 mW 0 dBm Up to 1 meter For more information about WLAN configuration and Bluetooth, see VoIP WLAN Configuration, page 2-21. User-specific information is contained in the Cisco Unified Wireless IP Phone 7925G User Guide. For more information about Bluetooth and hands-free profiles, refer to http://www.bluetooth.com. Handsfree Profile Your phone supports certain features of the Handsfree Profile, which is a standard set of features that enable users of handsfree devices (such as Bluetooth wireless headsets) to perform certain tasks without having to handle the phone, allowing users to be "handsfree." For example, instead of pressing Redial on your phone, you can redial a number from your Bluetooth wireless headset according to instructions from the headset manufacturer. These handsfree features apply to Bluetooth wireless headsets used with your Cisco Unified Wireless IP Phone 7925G: • Redial-Recalls the last number dialed. • Reject incoming call-Uses the iDivert option to direct the call to voicemail. Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1) 1-2 OL-15984-01