Radio Frequency Ranges; 802.11 Data Rates, Tx Power, Ranges, And Decibel Tolerances - Cisco 7925G - Unified Wireless IP Phone VoIP Administration Manual

Understanding WLAN Standards and Technologies

Radio Frequency Ranges

WLAN communications use the following RF ranges:
•
•
Table 2-1
Table 2-1
Regulatory Domain
Federal Communications
Commission (FCC)
Product number is
CP-7925GA-K9
ETSI (Europe)
Product number is
CP-7925GE-K9
Japan
Product number is
CP-7925GPC-CH1-K9
World
Product number is
CP-7925GW-K9

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

Table 2-2
the receiver by 801.11 standard.
Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1)
2-4
2.4 GHz—Does not require licensing. To reduce interference within this bandwidth, WLANs
transmit on non-overlapping channels, which are typically limited to three channels, although Japan
uses four channels.
Many devices operate in the 2.4 GHz bandwidth including cordless phones and microwave ovens
and can interfere with wireless communications. Interference does not destroy the signal, but can
reduce the transmission speed from 11 Mbps to 1 Mbps. RF interference can affect voice quality
over the wireless network.
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 802.11b or 802.11g.
lists frequency band ranges and operating channels by regulatory domain.
Frequency Bands and Operating Channels by Regulatory Domain
lists the Tx power capacities, data rates, ranges in feet and meters, and decibels tolerated by
Chapter 2
Frequency Band Range
2.412-2.462 GHz
5.15-5.25 GHz (UNII-1)
5.25-5.35 GHz (UNII-2)
5.725-5.825 (UNII-3)
5.470 - 5.725 (DFS)
5.47-5.725 GHz
(pending approval
2.412-2.472 GHz
5.15-5.725 GHz
2.412-2.472 GHz
2.412-2.484 GHz
5.15-5.35 GHz
—
Overview of the VoIP Wireless Network
Operating Channels
11 channels
8 of 11 channels
11 channels
13 channels
19 channels
13 channels (ODFM)
14 channels (CCK)
8 channels
Uses 802.11d to identify band
ranges and channels
OL-15984-01