Adtran TRC6410L2X ユーザーズマニュアル

Section 2  Microwave Path Engineering Basics

TRACER 6000 Series Integrated System Manual

 24

Copyright © 2005 ADTRAN, Inc.

612806420L1-1D

The overall wireless system is directly affected by the antenna selection and installation, discussed in the 
following sections.

With line-of-sight microwave communications, optimum system performance requires that the 
transmitting and receiving antennas are properly aligned. This ensures maximum received signal power at 
each receiver. Antenna alignment must be achieved in both azimuth (along a horizontal plane) and 
elevation (along a vertical plane). By ensuring maximum received signal strength, a received signal 
strength indicator (RSSI) helps the equipment installer determine when alignment is maximized. 

RSSI for the TRACER 64x0 system is provided through the VT100 terminal menus accessed through the 
RS-232 interface, and it is presented as a series of bars indicating signal strength. More bars means more 
RSSI, which ensures greater received signal strength and better link performance.

If both the local and remote end of the system are operational, the remote TRACER 64x0 receive power 
can be viewed from the local TRACER 64x0 VT100 terminal menu interface.

An RSSI test point located on the front panel provides a DC voltage level (relative to the 

 test point) 

that corresponds to the amount of signal being received from the far end’s transmitter. The voltage at this 
test point can vary from approximately 0 to 5 VDC. An RSSI calibration sheet is shipped with the system 
to provide the installer a cross-reference between actual received signal level (in dBm) and RSSI voltage. 
This sheet is useful for verifying link budget calculations and ensuring proper equipment installation.

The TRACER 64x0 system displays real-time signal values for 

, 

, and 

 

(for both the local and remote units). 

 values are displayed as a numerical value from 0 to 100, 

with 0 corresponding to poor signal quality and 100 corresponding to exceptional signal quality.

 

 values are displayed in dBm within ±5 dBm accuracy and can vary with extreme temperatures. 

 values are displayed in dBm within ±1 dBm accuracy.