Companies could install and manage the business application server remotely. Coverage hole detection and correction increases power levels on APs. 802.11h has been supported since Cisco Unified Wireless Network Software Release 3.1. ISM bands are generally confined to the 900 MHz and 2.45 GHz range, and are used by current 802.11b, 802.11g and Bluetooth devices. 2Jackman, S., Swartz, M., et al. If a second 802.11g client associates to the AP at 54 Mb/s, the AP would transmit broadcasts and multicasts at 1 Mb/s because this is the highest mandatory rate that all clients can receive.

The WLC has a centralized view of client distribution across all APs. • In-band emission limits, i.e. The algorithm determines whether a coverage hole exists when client SNR levels pass below a given SNR threshold.

Setting any of the OFDM rates (rates above 11mb/s) to mandatory disables 802.11b connectivity. In each RF group (if Group Mode is enabled), the controllers elect a leader and form an RF domain. dB is a logarithmic ratio of a signal to another standardized value. Multi-story structures such as office towers, hospitals, and university classroom buildings introduce a third dimension to coverage planning. The first group of settings in the Auto-RF configuration window, the RF Group, is used to determine whether the WLC joins the dynamic grouping with the other WLCs in the group. This number should be used as a guideline and can vary depending on the handset in use. This adds some of the AFC rules and spaces. Interference (as it pertains to a Cisco Unified Wireless Network deployment) is defined as unwanted RF signals in the same frequency band that can lead to a degradation or loss of service. The AP transmits only unicast packets at this rate; multicast and broadcast packets are transmitted at one of the data rates set to mandatory. If the amount of 802.11 interference hits a predefined threshold, the WLC attempts to rearrange channel assignments to optimize system performance in the presence of the interference. U-NII 2A (100 MHz) 120 MHz Gap. This provides the 802.11 radio with a greater chance of understanding the reception of a packet over the background noise or interference on the channel. The topics of this chapter include: In the United States there are three bands (frequency ranges) allocated for unlicensed industrial, scientific, and medical (ISM) usage (see Figure 3-1). If the amount of 802.11 interference hits a predefined threshold, the WLC attempts to rearrange channel assignments to optimize system performance in the presence of the interference. 802.11a allowed the use of 20 MHz channels. Organizations with existing 802.11b networks cannot simply deploy a new 802.11a network for existing APs and expect to have their 802.11a 54 Mbps coverage in the same areas as their 11Mbps 802.11b coverage. Changes in AP power do not impact clients. This revision added 11 additional channels, bringing the available channels capacity to 23 channels (see Figure 3-1). Not all channels in a given range can be used in all of the regulatory domains. It is also possible to implement a dual band deployment scheme, as shown in Figure 3-15.