Cisco 2911 Configuration Guide

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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 Transmit and Receive Antennas
Configuring Transmit and Receive Antennas
You can select the antenna that the wireless device uses to receive and transmit data. There are three
option settings for both the receive antenna (see step 4) and the transmit antenna (see step 5):
• Gain—Sets the resultant antenna gain in decibels (dB).
• Diversity—This default setting tells the wireless device to use the antenna that receives the best
signal. If the wireless device has two fixed (non-removable) antennas, you should use this setting
for both receive and transmit.
• Right—If the wireless device has removable antennas and you install a high-gain antenna on the
wireless device’s right connector, you should use this setting for both receive and transmit. When
you look at the wireless device’s back panel, the right antenna is on the right.
• Left—If the wireless device has removable antennas and you install a high-gain antenna on the
wireless device’s left connector, you should use this setting for both receive and transmit. When you
look at the wireless device’s back panel, the left antenna is on the left.
To select the antennas that the wireless device uses to receive and transmit data, follow these steps,
beginning in privileged EXEC mode.
SUMMARY STEPS
1. configure terminal
2. interface dot11radio {0| 1}
3. gain dB
4. antenna receive {diversity | left | right}
5. antenna transmit {diversity | left | right}
6. end
7. copy running-config startup-config
DETAILED STEPS
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
802.11g/n 2.4-GHz radio is radio 0.
The 802.11n 5-GHz radio is radio 1.
Step 3
gain dB Specifies the resultant gain of the antenna attached to the
device. Enter a value from –128 to 128 dB. If necessary, you
can use a decimal point in the value, such as “1.5”.
Step 4
antenna receive
{diversity | left | right}
Sets the receive antenna to diversity, left, or right.
Note For best performance with two antennas, leave the
receive antenna setting at the default setting, diversity.
For one antenna, attach the antenna on the right and set
the antenna for right.

Cisco 2911 Specifications

General

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, IEEE 802.3u
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
USB ports quantity	2
Ethernet LAN (RJ-45) ports	3
Firewall security	Cisco IOS
Input current	2.2 A
AC input voltage	100 - 240 V
Power source type	AC
AC input frequency	47 - 63 Hz
Power consumption (typical)	50 W
Product color	Black
Rack capacity	2U
Operating altitude	0 - 4000 m
Non-operating altitude	0 - 4570 m
Storage temperature (T-T)	-40 - 80 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	5 - 85 %
Safety	UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1
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	304.8 mm
Width	438.2 mm
Height	88.9 mm
Weight	8200 g