The Spectrum Analyzer is used to scan the spectrum to select a channel with the least interference during a link setup. The spectrum is scanned to compute maximum and minimum Received Signal Strength Indication (RSSI) on each channel. (RSSI is a measurement of the power present in a received radio signal).
- Maximum RSSI Represents the maximum RSSI of all the signals received during the scan on a given channel.
- Minimum RSSI Represents the minimum RSSI of all the signals received during the scan on a given channel.
- Average RSSI Represents the average RSSI of all the signals received during the scan on a given channel.
- Activity Count Represents the total wireless activities (including OFDM Signal and Errors) during the scan on a given channel
The antennas of the transmitter/receiver radios need to be physically aligned to have the best possible link between them. Proxim provides three options for the most accurate alignment:
- Audible Antenna Alignment
- Using CLI
- Using Link Test
Audible antenna alignment tool can be activated by plugging in the supplied serial dongle (It is audible up to 30 minutes ) or by issuing the CLI command for antenna alignment. The CLI command enables both audible and numerical feedback as the CLI shows the running Signal-to-Noise Ratio (SNR) values twice a second.
While using CLI for antenna alignment, CLI commands need to be used to enable the display of the local and remote SNR. Local SNR is the SNR measured by the receiver at the near end and Remote SNR is the SNR as measured by the receiver at the far end.
BSU\SU Link statistics provides information about the SUs connected to a BSU. Similarly, End Point B Link Statistics provides information about an End Point B currently connected to an End Point A device.
Information Link statistics shows, in graphical form, Signal, Noise and SNR levels at which packets are received at local and remote unit. The Link statistics displays the radio signal strength in relation to the noise in the signal path. These metrics can be used to optimize the antenna alignment by making modifications in the antenna orientation.
Dynamic Data Rate Selection (DDRS)
Dynamic Data Rate Selection (DDRS) feature allows the BSU or SU to monitor the remote average signal-to-noise ratio (SNR) and the number of retransmissions between the BSU and SU or vice versa. The BSU or SU adjusts the transmission data rate to an optimal value to provide the best possible throughput according to the current communication conditions and link quality. The BSU or SU runs the DDRS Algorithm separately based on their local DDRS Status configuration. When DDRS Status is enabled on the SU, it monitors the remote SNR and number of retransmissions for BSU and can adjust the transmission rate according to the link condition.