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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Configuring Radio Settings
Configuring MCS Rates
Use the no form of the speed command to remove one or more data rates from the configuration. This
example shows how to remove data rates basic-2.0 and basic-5.5 from the configuration:
ap1200# configure terminal
ap1200(config)# interface dot11radio 0
ap1200(config-if)# no speed basic-2.0 basic-5.5
ap1200(config-if)# end
Configuring MCS Rates
Modulation coding scheme (MCS) is a specification of PHY parameters consisting of modulation order
(binary phase shift keying [BPSK], quaternary phase shift keying [QPSK], 16-quadrature amplitude
modulation [16-QAM], 64-QAM) and forward error correction (FEC) code rate (1/2, 2/3, 3/4, 5/6). MCS
is used in the wireless device 802.11n radios, which define 32 symmetrical settings (8 per spatial
stream):
• MCS 0–7
• MCS 8–15
• MCS 16–23
• MCS 24–31
The wireless device supports MCS 0–15. High-throughput clients support at least MCS 0–7.
MCS is an important setting because it provides for potentially greater throughput. High-throughput data
rates are a function of MCS, bandwidth, and guard interval. The 802.11a, b, and g radios use 20-MHz
channel widths. Table 1 shows potential data rated based on MCS, guard interval, and channel width.
Step 4
end Returns to privileged EXEC mode.
Step 5
copy running-config
startup-config
(Optional) Saves your entries in the configuration file.
Command Purpose
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