Proxim CPN 65755B ADDITIONAL INTERFACE INFORMATION

Tsunami MP.11and MP.11a Installation and Management

ADDITIONAL INTERFACE INFORMATION

With Tsunami MP.11a units, Dynamic Frequency Selection (DFS) is enabled automatically based upon

the country you select. You can tell DFS is in use because the frequency selection drop-down box on

the Interfaces page is grayed out (click the Configure button and the Interfaces tab); it displays only

the DFS-selected frequency. You cannot select a preferred frequency or band in which to operate.

DFS scans all available frequencies in all available bands to select the operating frequency

automatically.

To comply with your country’s regulations, change the DFS selection to specify your country. You can

do this by logging into the unit, clicking the Configure button and selecting the System tab. There is a

drop-down box labeled “Country” with all available countries from which to select. Choose your country,

configure the unit as required, and reboot for the settings to take effect.

Note: Because DFS must scan for radar and interference on multiple channels, you must allow a

sufficient amount of time for the units to start up. This is considerably longer than when the unit

is not using DFS. Startup time is usually within two to three minutes if no radar is detected. If

radar is detected, the unit may reboot multiple times before it becomes fully operational and can

take much longer to start. This is expected behavior.

Dynamic Frequency Selection (DFS) is required in ETSI countries and is enabled automatically when

you select a country with a regulatory domain that requires DFS. DFS is required in ETSI countries for

two purposes.

1. Radar avoidance both at startup and while operational. To meet these requirements, the Tsunami

MP.11a BSU scans available frequencies at startup for the presence of a radar signal on all

available frequencies; it does not use any frequency in which radar signals are detected. Once fully

operational on a frequency, the BSU actively monitors the occupied frequency for radar interference.

If radar interference is detected, the BSU logs a message and reboots to find a new frequency free

of interference.

Understand that radar detection is performed only by the BSU and not by the SU. When an SU is

set to a country in which DFS is used, it scans all available channels upon startup looking for a BSU

that best matches its connection criteria (such as Base Station System Name, Network Name,

and Shared Secret). The SU connects to the BSU automatically on whatever frequency the BSU

has selected. Because of this procedure, it is best to set up the BSU and have it fully operational

before installing the SU, although this is not required. If a BSU reboots because of radar

interference, the SU loses its WORP link and reboots to rescan available frequencies for an active

BSU.

Chapter 5. Web Interface 67

CPN 65755 Issue Date: August 2003