Brocade Communications Systems Mobility 7131 Series Service Manual download pdf (Page 181)

Brocade Mobility 7131 Access Point Product Reference Guide 169

53-1002517-01

CAUTION

Indoor channels for a Brocade Mobility Mobility 7131 Access Point model access point are

different then a Mobility 7131N model access point’s indoor channels due to FCC regulatory

restrictions. When deploying a mesh network, Brocade Mobility recommends manually

configuring channels and not using the Automatic or Uniform options.

802.11 b/g/n mode For radio1, specify B, G and N, B and G, G Only, B only or N Only to define whether the 802.11b/g/n radio

transmits in the 2.4 Ghz band exclusively for 802.11b (legacy) clients or transmits in the 2.4 Ghz band for

802.11g/n clients. Selecting b and g enables the Mobility 7131 Access Point to transmit to both b and g clients if

legacy clients (802.11b) partially comprise the network. Select accordingly based on the MU requirements of the

network.

The rates for the access point’s 2.4 GHz radio are as follows:

B, G and N - Allows only basic rates (default setting).

B and G - Allows 11b basic rates. Does not allow MCS rates.

G and N - Requires basic rates (either 6, 12, 24 or 1, 2, 5.5, 11, 6, 12, 24).

G Only - Requires one 11g basic rate. Does not allow MCS rates.

B Only - Allows for 11b rates only. Does not allow G or N rates.

N Only - Requires basic MCS rates.

Note: If the mode is B and G, the Channel Width option is not available, and a Secondary Channel cannot be

defined.

For the 5 GHz radio, specify

A and N, A Only or N Only to define whether the 802.11a/n radio transmits in the 5

Ghz band exclusively for 802.11a clients, 802.11n clients or transmits in the 5 Ghz band for both 802.11a/n

clients.

A Only - Allows 11a rates.

N Only - Requires basic MCS rates.

A and N - Allows only 11a basic rates (default setting).

Channel Width Select the

Channel Width (MHz) from the drop-down menu. The AP radio can support 20 and 40 MHz

channel widths. 20 MHz is the default setting for the 2.4 GHz radio. 20/40 MHz operation (the default setting for

the 5 GHz radio) allows the access point to receive packets from clients using 20 MHz of bandwidth while

transmitting a packet using 40 MHz bandwidth. This mode is supported for 11n users on both the 2.4 and 5 GHz

radios. If an 11n user selects two channels (a Primary and Secondary channel), the system is configured for

dynamic 20/40 operation.

When 20/40 is selected, clients can take advantage of “wider channels.” 802.11n clients experience improved

throughput using 40 MHz while legacy clients (either 802.11a or 802.11b/g depending on the radio selected) can

still be serviced without interruption using 20 MHz. Define a value as needed depending on the channel used. This

field is not available when B and G is selected as the 802.11 b/g/n mode.

Channel Selection The following channel selection options exist:

User Selected - This is the default setting. If 20/40 MHz is selected as the Channel Width (supporting 11n), the

Secondary Channel drop-down menu becomes enabled. The user must define the primary channel first. Then,

depending on the primary channel defined, the secondary channel list is filled with channels making the

combination of primary and secondary channels valid. The actual channels available depend on regulatory domain

requirements.

Automatic - When the access point is booted, the access point scans non-overlapping channels listening for

beacons from other access points. After the channels are scanned, it will select the channel with the fewest access

points. In the case of multiple access points on the same channel, it will select the channel with the lowest average

power level.

The

Random option is available for use with the 802.11a/n radio. To comply with Dynamic Frequency Selection

(DFS) requirements in the European Union, the 802.11a/n radio uses a randomly selected channel each time the

access point is powered on.

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Brocade Communications Systems Mobility 7131 Series Service Manual Page 181

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