Channels and Maximum Power Settings for Cisco Aironet Lightweight Access Points, OL-11321-07
Cisco Aironet 1240AG Series Access Points
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Cisco Aironet 1240 Series Access Points

Table Of Contents

Cisco Aironet 1240 Series Access Points

Channels and Maximum Power Levels

IEEE 802.11g (2.4-GHz Band)

IEEE 802.11g (2.4-GHz Band)

IEEE 802.11a (5-GHz Band)

Maximum Power Levels in Some Regulatory Domains with External Antennas

Special Country Restrictions

Changing the Lightweight Access Point Output Power


Cisco Aironet 1240 Series Access Points


This chapter lists the 1240 series lightweight access point (models: AIR-LAP1242AG-x-K9 and AIR-LAP1242G-x-K9) IEEE 802.11b/g (2.4-GHz) and the IEEE 802.11a (5-GHz) channels and maximum power levels supported by the world's regulatory domains. For additional product hardware information refer to the Cisco Aironet 1240AG Series Access Point Hardware Installation Guide.

The following topics are covered in this chapter:

Channels and Maximum Power Levels

Special Country Restrictions

Changing the Lightweight Access Point Output Power

Channels and Maximum Power Levels

IEEE 802.11g (2.4-GHz Band)

When shipped from the factory, the AIR-AP1242G-x-K9 (single radio) access points support the channels and maximum power levels listed in Table 6-1 for their regulatory domain.


Note Table 6-1 lists the power levels shipped from the factory. The B columns indicate IEEE 802.11b data rates and the G columns indicate IEEE 802.11g data rates . In the -C, -E, -I, -K, and -S regulatory domains, you must manually adjust power levels depending upon the antenna being used (see Table 6-4).


.

Table 6-1 Channels and Maximum Conducted Power for the 802.11g Radio with up to 10-dBi External Antennas

Channel Id
Center Frequency
(MHz)
Maximum Conducted Power Levels (dBm) in the Regulatory Domains
-A
-J
-P
B
G
B
G
B
G

1

2412

20

17

14

14

14

14

2

2417

20

17

14

14

14

14

3

2422

20

17

14

14

14

14

4

2427

20

17

14

14

14

14

5

2432

20

17

14

14

14

14

6

2437

20

17

14

14

14

14

7

2442

20

17

14

14

14

14

8

2447

20

17

14

14

14

14

9

2452

20

17

14

14

14

14

10

2457

20

17

14

14

14

14

11

2462

20

17

14

14

14

14

12

2467

-

-

14

14

14

14

13

2472

-

-

14

14

14

14

14

2484

-

-

14

-

14

-


IEEE 802.11g (2.4-GHz Band)

When shipped from the factory, the AIR-LAP1242AG-x-K9 (dual radio) access points support the channels and maximum power levels listed in Table 6-1 for their regulatory domain.


Note Table 6-2 lists the power levels shipped from the factory. The B columns indicate IEEE 802.11b data rates and the G columns indicate IEEE 802.11g data rates. In the -C, -E, -I, -K, and -S regulatory domains, you must manually adjust power levels depending upon the antenna being used (see Table 6-4).


.

Table 6-2 Channels and Maximum Conducted Power for the 802.11b/g Radio with up to 10-dBi External Antennas

Channel Id
Center Freq
(MHz)
Maximum Conducted Power Levels (dBm) in the Regulatory Domains
-A
-C
-E
-I
-J
-K
-N
-P
-Q
-R
-S
-T
B
G
B
G
B
G
B
G
B
G
B
G
B
G
B
G
B
G
B
G
B
G
B
G

1

2412

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

2

2417

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

3

2422

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

4

2427

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

5

2432

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

6

2437

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

7

2442

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

8

2447

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

9

2452

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

10

2457

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

11

2462

20

17

17

17

17

17

17

17

14

14

17

17

20

17

14

14

14

14

17

17

17

17

20

17

12

2467

-

-

17

17

17

17

17

17

14

14

17

17

-

-

14

14

14

14

17

17

17

17

-

-

13

2472

-

-

17

17

17

17

17

17

14

14

17

17

-

-

14

14

14

14

17

17

17

17

-

-

14

2484

-

-

-

-

-

-

-

-

14

-

-

-

-

-

14

-

14

-

-

-

-

-

-

-


IEEE 802.11a (5-GHz Band)

When shipped from the factory, the AIR-LAP1242AG-x-K9 (dual radio) access points support the channels and maximum power levels listed in Table 6-3 for their regulatory domain.


Note Table 6-3 lists the power levels shipped from the factory. In the -E and -I regulatory domains, you must manually adjust power levels depending upon the antenna being used (see Table 6-5).


.

Table 6-3 Channels and Maximum Conducted Power for IEEE 802.11a Radio with up to 9.5-dBI External Antennas 

Channel ID
Center Freq
(MHz)
Maximum Conducted Power Levels (dBm) in the Regulatory Domains
-A
-C
-E
-I
-J
-K
-N
-P
-Q
-R
-U
-S
-T
5150 to 5250 MHz

34

5170

-

-

-

-

11

-

-

-

-

-

-

-

-

36

5180

11

-

17

17

-

15

11

11

11

16

11

14

-

38

5190

-

-

-

-

11

-

-

-

-

-

-

-

-

40

5200

11

-

17

17

-

15

11

11

11

16

11

14

-

42

5210

-

-

-

-

11

-

-

-

-

-

-

-

-

44

5220

11

-

17

17

-

15

11

11

11

16

11

14

-

46

5230

-

-

-

-

11

-

-

-

-

-

-

-

-

48

5240

11

-

17

17

-

15

11

11

11

16

11

14

-

5250 to 5350 MHz

52

5260

171

-

172

171

-

171

171

81

81

16

-

111

-

56

5280

171

-

171

171

-

171

171

81

81

16

-

111

11

60

5300

171

-

171

171

-

171

171

81

81

16

-

111

11

64

5320

111

-

171

171

-

171

111

81

81

16

-

111

11

5450 to 5725 MHz

100

5500

171

-

171

-

-

171

-

-

151

-

-

-

171

104

5520

171

-

171

-

-

171

-

-

151

-

-

-

171

108

5540

171

-

171

-

-

171

-

-

151

-

-

-

171

112

5560

171

-

171

-

-

171

-

-

151

-

-

-

171

116

5580

171

-

171

-

-

171

-

-

151

-

-

-

171

120

5600

-

-

171

-

-

171

-

-

151

-

-

-

171

124

5620

-

-

171

-

-

171

-

-

151

-

-

-

171

128

5640

-

-

171

-

-

-

-

-

151

-

-

-

171

132

5660

171

-

171

-

-

-

-

-

151

16

-

-

171

136

5680

171

-

171

-

-

-

-

-

151

16

-

-

171

140

5700

171

-

171

-

-

-

-

-

151

16

-

-

171

5725 to 5850 MHz

149

5745

17

17

-

-

-

17

17

-

-

16

-

17

17

153

5765

17

17

-

-

-

17

17

-

-

16

-

17

17

157

5785

14

17

-

-

-

17

14

-

-

16

-

17

14

161

5805

11

17

-

-

-

17

11

-

-

16

-

17

11

165

5825

-

-

-

-

-

-

-

-

-

-

-

-

-

1 Frequencies require DFS (Uniform spreading not required for the -P regulatory domain).

2 Frequencies require DFS (Uniform spreading not required for the -P regulatory domain).


Maximum Power Levels in Some Regulatory Domains with External Antennas


Caution To avoid exceeding maximum conducted power levels in the China (-C), EMEA (-E), South Korea (-K), Israel (-I), and Singapore (-S) regulatory domains when using an 802.11b/g radio with 2.2- to 10-dBi external antennas, you must manually set the access point output power level as shown in Table 6-4.

Table 6-4 Maximum Power Levels for the 802.11b/g Radio in the (-C), (-E), (-K), (-I), and (-S) Regulatory Domains

Channel Identifier
Center Frequency
(MHz)
Maximum Power Levels (dBm)
2.2 dBi
Antenna
5.2 dBi
Antenna
6.0 dBi
Antenna
6.5dBi
Antenna
9.0 dBi
Antenna
10 dBi
Antenna

1

2412

17

14

14

11

11

8

2

2417

17

14

14

11

11

8

3

2422

17

14

14

11

11

8

4

2427

17

14

14

11

11

8

5

2432

17

14

14

11

11

8

6

2437

17

14

14

11

11

8

7

2442

17

14

14

11

11

8

8

2447

17

14

14

11

11

8

9

2452

17

14

14

11

11

8

10

2457

17

14

14

11

11

8

11

2462

17

14

14

11

11

8

12

2467

17

14

14

11

11

8

13

2472

17

14

14

11

11

8

14

2484

-

-

-

-

-

-



Caution To avoid exceeding maximum conducted power levels in the EMEA (-E) and Israel (-I) regulatory domains when using a IEEE 802.11a radio with 6.0- to 9.5-dBi external 5-MHz antennas, you must manually set the access point output power level as shown in Table 6-5.

Table 6-5 Maximum Power Levels for IEEE 802.11a Radio in the EMEA(-E) and Israel (-I) Regulatory Domains

Channel Identifier
Center Frequency
(MHz)
Maximum Power Levels (dBm)
3.5 dBi Antenna
4.5 dBi Antenna
6.0 dBi Antenna
7.0 dBi Antenna
9.5 dBi Antenna

UNII-1 (5150-5250 MHz)

34

5170

-

-

-

-

-

36

5180

17

17

15

15

11

38

5190

-

-

-

-

-

40

5200

17

17

15

15

11

42

5210

-

-

-

-

-

44

5220

17

17

15

15

11

46

5230

-

-

-

-

-

48

5240

17

17

15

15

11

5250 to 5350 MHz

52

5260

17

17

15

15

11

56

5280

17

17

15

15

11

60

5300

17

17

15

15

11

64

5320

17

17

15

15

11

5470 to 5725 MHz

100

5500

17

17

17

17

17

104

5520

17

17

17

17

17

108

5540

17

17

17

17

17

112

5560

17

17

17

17

17

116

5580

17

17

17

17

17

120

5600

17

17

17

17

17

124

5620

17

17

17

17

17

128

5640

17

17

17

17

17

132

5660

17

17

17

17

17

136

5680

17

17

17

17

17

140

5700

17

17

17

17

17

5725 to 5850 MHz

149

5745

-

-

-

-

-

153

5765

-

-

-

-

-

157

5785

-

-

-

-

-

161

5805

-

-

-

-

-

165

5825

-

-

-

-

-


Table 6-6 Maximum Power Levels for IEEE 802.11a Radio in the Russia (-R) Regulatory Domain

Channel Identifier
Center Frequency
(MHz)
Maximum Power Levels (dBm)
3.5 dBi Antenna
4.5 dBi Antenna
6.0 dBi Antenna
7.0 dBi Antenna
9.5 dBi Antenna

UNII-1 (5150-5250 MHz)

34

5170

-

-

-

-

-

36

5180

16

15

14

13

10

38

5190

-

-

-

-

-

40

5200

16

15

14

13

10

42

5210

-

-

-

-

-

44

5220

16

15

14

13

10

46

5230

-

-

-

-

-

48

5240

16

15

14

13

10

5250 to 5350 MHz

52

5260

16

15

14

13

10

56

5280

16

15

14

13

10

60

5300

16

15

14

13

10

64

5320

16

15

14

13

10

5470 to 5725 MHz

100

5500

-

-

-

-

-

104

5520

-

-

-

-

-

108

5540

-

-

-

-

-

112

5560

-

-

-

-

-

116

5580

-

-

-

-

-

120

5600

-

-

-

-

-

124

5620

-

-

-

-

-

128

5640

-

-

-

-

-

132

5660

16

15

14

13

10

136

5680

16

15

14

13

10

140

5700

16

15

14

13

10

5725 to 5850 MHz

149

5745

16

15

14

13

10

153

5765

16

15

14

13

10

157

5785

16

15

14

13

10

161

5805

16

15

14

13

10

165

5825

-

-

-

-

-


Special Country Restrictions

Table 6-7 lists special restrictions for wireless operation in some countries.

Table 6-7 Special Country Restrictions for Wireless Operation

Country
Frequency Bands (GHz)
Regulatory Domain
Special Limitation and Restrictions

Japan

5

-J, -P, and -U

Operation limited to indoor only.

South Korea

2.4 and 5

-K

Maximum antenna gain limited to 6 dBi.

Mexico

2.4

-N

End user must limit 2.4 GHz operation to 2450 to 2483.5 MHz and
36 dBm EIRP1 .

Russian Federation

5

-R

End user must limit 5 GHz operation to 5150-5350 and
5650 to 5725 MHz.

United States

5

-A

Indoor use only from 5150-5250 MHz.

1 EIRP (dBm) = Maximum output power (dBm) + antenna gain (dBi)


Changing the Lightweight Access Point Output Power

This section provides instructions for changing the 1240 series access point output power to comply with the maximum power limits imposed by special regulatory and country restrictions (see the "Special Country Restrictions" section). Follow these instructions to change the output power settings using a controller and your browser:


Note Administrator privileges may be required in order to change access point settings.



Note Regulatory domains are set at the factory and cannot be changed by the user.



Caution To meet regulatory restrictions, the access point and the external antenna must be professionally installed. The network administration or other IT professional responsible for installing and configuring the unit is a suitable professional installer. Following installation, access to the unit should be
password-protected by the network administrator to maintain regulatory compliance.

The output power on the access points can be changed only using a Cisco controllers (such as the 2600 series or 4400 series), the controllers on a Cisco Wireless Services Module (WiSM), or using Cisco Wireless Control System (WCS).


Note See the Cisco Wireless LAN Controller Configuration Guide for more details on how to to configure your access point using the web-browser interface.


Follow these steps to change the access point's output power to meet local regulations using a controller:


Step 1 Open your Internet browser. You must use Microsoft Internet Explorer 6.0.2800 or a later release.

Step 2 Enter https://IP address (where IP address is the controller's IP address) in the browser address line and press Enter. A user login screen appears.

Step 3 Enter the username and password and press Enter. The controller's summary page appears.


Note The username and password are case-sensitive.


Step 4 Click Wireless > 802.11a Radios or 802.11b/g Radios and a list of associated access points displays.

Step 5 Choose the desired access point and click Configure. The radio settings page appears.

Step 6 Scroll down to the Tx Power Level Assignment field, and click Custom.

Custom indicates that the radio output power is manually controlled by the Tx Power Configuration setting field.

Step 7 In the Tx Power Level field, select the appropriate power level setting (1 to 8).

Based on the operating channel, the regulatory domain, and the controller power level setting (1 to 8), the actual transmit power at the access point can be reduced to comply with special regulatory or country restrictions.

Table 6-8 lists the controller power settings and the corresponding output power levels for these two examples:

2.4 GHz (802.11b/g) operation in -E regulatory domain:

Channel 2 using 11-Mbps data rates with 6-dBi external antenna

5 GHz (802.11a) operation:

Channel 52 with 6-dBi external antenna

Table 6-8 Example of Output Power Levels

Controller
Tx Power Settings 1
Radio Output Power
802.11b/g (dBm)
802.11a (dBm)

1 (maximum)

172

172

2

14

14

3

11

11

4

8

8

5

5

5

6

2

2

7

-1

-1

8

-

-

1 The Tx Power Level setting of 1 represents the maximum conducted power setting for the access point. Each subsequent controller power level (such as 2, 3, 4, etc.) represents approximately a 3-dBm reduction in transmit power from the previous power level.

2 The maximum output power levels obtained from Table 6-2 and Table 6-3.


For 802.11b/g (see Table 6-4 and Table 6-8), the manual controller Tx Power Level setting is 2.

For 802.11a (see Table 6-5 and Table 6-8), the manual controller Tx Power Level setting is 2.

Step 8 Click Apply.

Step 9 Close your Internet browser.