Microwave Data Systems MDS entraNET 2400 Especificaciones descargar pdf (Pagina 130)

122 MDS entraNET 900 System Guide MDS 05-4055A01, Rev. A

These various events are stored in the transceiver’s “Event Log” and can

be a valuable aid in troubleshooting unit problems or detecting attempts

at breaching network security.

7.1.4 Antenna Direction Optimization

Introduction

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 will provide the basis for reliable commu-

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

Access Point and Remotes increases, the influence of terrain, foliage

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

directional antennas at Remote locations becomes necessary. Direc-

tional antennas usually require some fine-tuning of their bearing to opti-

mize 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 will be displayed by the entraNET Management System.

The measurement and antenna alignment process will usually take 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 the Remote is associated with an Access Point unit. Observe

the condition of the

LINK LED.

LINK LED = On or Blinking

This will indicate 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 3-33 on Page 61). 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

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Microwave Data Systems MDS entraNET 2400 Especificaciones Pagina 130