Cisco 2901 User Manual

279
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Configuring Radio Settings
Enabling and Disabling World Mode
Setting the 802.11n Guard Interval
The 802.11n guard interval is the period in nanoseconds between packets. Two settings are available:
short (400ns) and long (800ns).
To to set the 802.11n guard interval, follow these steps, beginning in privileged EXEC mode.
SUMMARY STEPS
1. configure terminal
2. interface dot11radio {0 | 1}
3. guard-interval {any | long}
4. end
5. copy running-config startup-config
DETAILED STEPS
Enabling and Disabling World Mode
You can configure the wireless device to support 802.11d world mode, Cisco legacy world mode, or
world mode roaming. When you enable world mode, the wireless device adds channel carrier set
information to its beacon. Client devices with world mode enabled receive the carrier set information
and adjust their settings automatically. For example, a client device used primarily in Japan could rely
on world mode to adjust its channel and power settings automatically when it travels to Italy and joins a
network there. Cisco client devices detect whether the wireless device is using 802.11d or Cisco legacy
world mode and automatically use the world mode that matches the mode used by the wireless device.
You can also configure world mode to be always on. In this configuration, the access point essentially
roams between countries and changes its settings as required.
World mode is disabled by default.
To enable world mode, follow these steps, beginning in privileged EXEC mode.
Command Purpose
Step 1
configure terminal Enters global configuration mode.
Step 2
interface dot11radio {0 | 1} Enters interface configuration mode for the radio interface.The
802.11n 2.4-GHz radio is radio 0.
The 802.11n 5-GHz radio is radio 1.
Step 3
guard-interval {any | long} Specifies a guard interval.
• any allows either the short (400ns) or long (800ns) guard
interval.
• long allows only the long (800ns) guard interval.
Step 4
end Returns to privileged EXEC mode.
Step 5
copy running-config
startup-config
(Optional) Saves your entries in the configuration file.

Cisco 2901 Specifications

General

Operating altitude	0 - 3000 m
Non-operating altitude	0 - 4570 m
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	10 - 85 %
Ethernet LAN	Yes
Cabling technology	10/100/1000BASE-T(X)
Networking standards	IEEE 802.1Q, IEEE 802.1ag, IEEE 802.3, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3ah
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet interface type	Gigabit Ethernet
DHCP client	-
Routing protocols	BGP, EIGRP, OSPF
Supported protocols	IPv4, IPv6, IS-IS, IGMPv3, PIM SM, SSM, DVMRP, IPSec, GRE, BVD, MPLS, L2TPv3, PPP, MLPPP, MLFR, HDLC, RS-232, RS-449, X.21, V.35, EIA-530, PPPoE, ATM
USB version	2.0
RS-232 ports	1
Expansion slots	4 x EHWIC 2 x DSP 1 x ISM
Ethernet LAN (RJ-45) ports	2
Firewall security	Cisco IOS
Input current	1.5 A
AC input voltage	100 - 240 V
Power source type	AC
AC input frequency	47 - 63 Hz
Power consumption (typical)	40 W
Product color	Black
Rack capacity	1U
Safety	UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1
Flash memory	256 MB
Internal memory	512 MB
Electromagnetic compatibility	47 CFR, ICES-003, EN55022, CISPR22, AS/NZS 3548, VCCI V-3, EN 300-386, EN 61000, EN 55024, CISPR 24EN50082-1

Weight and Dimensions

Depth	439.4 mm
Width	438.2 mm
Height	44.5 mm
Weight	6100 g