Cisco 2800 Series Configuring

Configuring Radio Settings on an Access Point
How to Configure Radio Settings on an Access Point
15
Enabling and Disabling Short Radio Preambles on an Access Point
Perform this task to enable or disable short radio preambles.
Radio Preambles
The radio preamble (sometimes called a header) is a section of data at the head of a packet that contains
information that the AP and client devices need when sending and receiving packets. You can set the
radio preamble to long or short:
• Short—A short preamble improves throughput performance. Cisco Aironet Wireless LAN Client
Adapters support short preambles. Early models of Cisco Aironet's Wireless LAN Adapter (PC4800
and PC4800A) require long preambles.
• Long—A long preamble ensures compatibility between the AP and all early models of Cisco
Aironet Wireless LAN Adapters (PC4800 and PC4800A). If these client devices do not associate to
your access points, you should use short preambles.
Note You cannot configure short or long radio preambles on the 5-GHz radio.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface dot11Radio interface
4. preamble-short
5. end
6. copy running-config startup-config

Cisco 2800 Series Specifications

General

Power Supply	Internal power supply
Product Type	Router
Form Factor	Rack-mountable
Connectivity Technology	Wired
Power Device	Internal power supply
Operating System	Cisco IOS
Integrated Services	Security, voice
WAN Interfaces	T1/E1, Serial
LAN Interfaces	Fast Ethernet, Gigabit Ethernet
Expansion Slots	4
Data Link Protocol	Ethernet, Fast Ethernet, Gigabit Ethernet
Network/Transport Protocol	IP, TCP
Remote Management Protocol	SNMP, Telnet
Features	VPN support, Quality of Service (QoS), VLAN support
Voltage Required	AC 100-240 V
Security Features	Firewall, VPN, Access Control Lists (ACLs)