Wireless Modulation Technologies - Cisco 7925G - Unified Wireless IP Phone VoIP Administration Manual

Chapter 2 Overview of the VoIP Wireless Network
Table 2-2
Standard
802.11a
802.11g
802.11b
1. Adjusts dynamically when associating with an AP if the AP client setting is enabled.
2. Advertised rates by the APs are used. If the Restricted Data Rates functionality is enabled in the Cisco Unified

Wireless Modulation Technologies

Wireless communications uses the following modulation technologies for signaling:
•
Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1)
OL-15984-01
Tx Power, Data Rates, Ranges, and Decibels by Standard
Maximum
Tx Power
40mW
40mW
50mW
Communications Manager Administration phone configuration, then the Traffic Stream Rate Set IE (CCX V4) is used.
Direct-Sequence Spread Spectrum (DSSS)—Prevents interference by spreading the signal over the
frequency range or bandwidth. DSSS technology multiplexes chunks of data over several
frequencies so that multiple devices can communicate without interference. Each device has a
special code that identifies its data packets and all others are ignored. Cisco wireless 802.11b/g
products use DSSS technology to support multiple devices on the WLAN.
Understanding WLAN Standards and Technologies
1 2
Data Rate
6 Mbps
9 Mbps
12 Mbps
18 Mbps
24 Mbps
36 Mbps
48 Mbps
54 Mbps
6 Mbps
9 Mbps
12 Mbps
18 Mbps
24 Mbps
36 Mbps
48 Mbps
54 Mbps
1 Mbps
2 Mbps
5.5 Mbps
11 Mbps
Receiver
Range Sensitivity
610 ft (186 m) -89 dBm
610 ft (186 m) -88 dBm
558 ft (170 m) -86 dBm
541 ft (165 m) -85 dBm
508 ft (155 m) -82 dBm
426 ft (130 m) -80 dBm
328 ft (100 m) -76 dBm
295 ft (90 m) -74 dBm
722 ft (220 m) -90 dBm
656 ft (200 m) -89 dBm
623 ft (190 m) -87 dBm
623 ft (190 m) -85 dBm
623 ft (190 m) -82 dBm
492 ft (150 m) -78 dBm
410 ft (125 m) -74 dBm
394 ft (120 m) -73 dBm
1,027 ft (313 m) -95 dBm
951 ft (290 m) -89 dBm
853 ft (260 m) -89 dBm
787 ft (240 m) -85 dBm
2-5