Cisco Systems 8961 Radio Frequency Ranges, Data Rates, Tx Power, Ranges, and Decibel Tolerances

Chapter 6 Understanding the VoIP Wireless Network

Understanding WLAN Standards and Technologies

Hungary (HU)	Peru (PE)	Venezuela (VE)
Iceland (IS)	Philippines (PH)	Vietnam (VN)

Radio Frequency Ranges

WLAN communications use the following radio frequency (RF) ranges:

•2.4 GHz—Many devices that utilize 2.4 GHz can potentially interfere with the 802.11b/g connection. An interferer can produce a Denial of Service (DoS) scenario, possibly preventing successful 802.11 transmissions.

•5 GHz—Divided into several sections called Unlicensed National Information Infrastructure (UNII) bands and has four channels each. The channels are spaced at 20 MHz to provide non-overlapping channels and more channels than with 2.4 GHz.

802.11Data Rates, Tx Power, Ranges, and Decibel Tolerances

Table 6-2lists the Tx power capacities, data rates, ranges in feet and meters, and decibels tolerated by the receiver by 801.11 standard.

Table 6-2	Tx Power, Data Rates, Ranges, and Decibels by Standard
Standard	Maximum Tx Power1	Data Rate2	Range	Receiver Sensitivity
802.11a
	16 dBm	6 Mbps	604 ft (184 m)	-91 dBm
		9 Mbps	604 ft (184 m)	-90 dBm
		12 Mbps	551 ft (168 m)	-88 dBm
		18 Mbps	545 ft (166 m)	-86 dBm
		24 Mbps	512 ft (156 m)	-82 dBm
		36 Mbps	420 ft (128 m)	-80 dBm
		48 Mbps	322 ft (98 m)	-77 dBm
		54 Mbps	289 ft (88 m)	-75 dBm
802.11g
	16 dBm	6 Mbps	709 ft (216 m)	-91 dBm
		9 Mbps	650 ft (198 m)	-90 dBm
		12 Mbps	623 ft (190 m)	-87 dBm
		18 Mbps	623 ft (190 m)	-86 dBm
		24 Mbps	623 ft (190 m)	-82 dBm
		36 Mbps	495 ft (151 m)	-80 dBm
		48 Mbps	413 ft (126 m)	-77 dBm
		54 Mbps	394 ft (120 m)	-76 dBm

Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)

OL-20861-01 6-5