Microwave Data Systems MDS entraNET 2400 Especificaciones descargar pdf (Pagina 172)

162 GE MDS entraNET Reference Manual 05-4055A01, Rev. D

6.5.2 Aiming Directive Antennas for Maximum RSSI

The wireless network integrity depends, in a large part, on stable radio

signal levels being received at each end of a data link. In general, signal

levels stronger than –90 dBm provides the basis for reliable communi-

cation that includes a 15 dB fade margin. As the distance between the

AP and Remotes increases, the influence of terrain, foliage, and

man-made obstructions become more influential, and the use of direc-

tional antennas at remote locations becomes necessary. Directional

antennas usually require some fine-tuning of their bearing to optimize

the received signal strength. The transceiver has a built-in received

signal strength indicator (RSSI) that can be used to tell you when the

antenna is in a position that provides the optimum received signal.

RSSI measurements and Wireless Packet Statistics are based on mul-

tiple samples over a period of several seconds. The average of these

measurements is displayed by the entraNET MS.

The measurement and antenna alignment process usually takes 10 or

more minutes at each transceiver.

The path to the Management System Menu item is shown in bold text

below each step of the procedure.

Procedure

1. Verify that the Remote is associated with an AP radio. Observe the

condition of the LINK LED.

LINK LED = on or blinking

This indicates that you have an adequate signal level for the

measurements, and it is safe to proceed.

2. View and record the Radio Retries and No Ack counts on the Radio

Packet Statistics Screen (Figure 3-45 on Page 81). This information

will be used later.

3. Clear the Radio Statistics history.

4. Read the RSSI level at the Remote (RADIO RSSI=).

5. Optimize the RSSI by slowly adjusting the direction of the antenna

and watching for a peak in received signal strength. Get the RSSI

indication several times after making each adjustment, so that the

RSSI accurately reflects any change in the link signal strength. The

higher the indication (less negative), the stronger the signal level

(that is, –60 is better than –70).

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Microwave Data Systems MDS entraNET 2400 Especificaciones Pagina 172