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Cisco 7925G - Unified Wireless IP Phone VoIP Посібник з адміністрування
Understanding Bluetooth Technology
Table 1-1 Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Components (continued)
17 Application
18 Barcode
Related Topics
•
•
Understanding Bluetooth Technology
The Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G is a full-feature telephone and a
qualified Bluetooth wireless device (Qualified Device ID [QDID] B014396) and provides voice
communication over the same wireless LAN that your computer uses. 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, which
is the same as the 802.11b/g band. This unlicensed band in most countries includes the frequency range
from 2400 to 2483.5 MHz. Bluetooth enables low bandwidth wireless connections within a range of 10
meters. The best performance is in the 1 to 2 meter range. 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
microsecond (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.
The Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G contains a Bluetooth module and
802.11 WLAN module. This coexistence 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 1-2
Class
Class 1
Class 2
Class 3
Bluetooth Class 2.0 with Extended Data Rate (EDR) is a short-range wireless technology that is
supported by the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G. The phones supports
the Hands-Free Profile version 1.5.
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
1-6
Configurable button that is used with XML applications, such as Push to Talk or
button
Directory services. See
Use with Java MIDlet applications to allow you to scan barcodes.
scanner
Available only on the Cisco Unified Wireless IP Phone 7926G
Note
Features Supported on the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G,
page 1-8
Overview of Configuring and Installing the Cisco Unified Wireless IP Phone 7925G, 7925G-EX,
and 7926G, page 1-15
Bluetooth Maximum Permitted Transmit Power and Range by Class
Maximum Permitted Transmit Power (mW, dBm)
100 mW, 20 dBm
2.5 mW, 4 dBm
1 mW, 0 dBm
Chapter 1
Overview of the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G
"Setting Up Services" section on page
7-18.
Table
1-2.
Range
Up to 100 meters
Up to 10 meters
Up to 1 meter