Motorola PTP 400 Series Manual De Usuario

 

 

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7.7.10  Aligning the PTP 400 Series ODUs

 

 

The following is a description of the steps taken to establish a radio link between the two  

units forming the bridge and align the units for the best signal strength.  

The PTP 400 Series Bridge uses audible tones during installation to assist the installer with 

alignment. The installer should adjust the alignment of the ODU in both azimuth and elevation 

until highest pitch tone is achieved

. The tones and their meanings are as follows:  

Band Scan 

Regular beep 

Executing band scan 

N/A 

Scanning 

Slow broken tone 

Not demodulating the 
wanted signal 

Rx Power 

Synchronized  Fast broken tone 

Demodulating the wanted 
signal 

Rx Power 

Registered 

Solid tone 

Both Master and Slave 
units exchanging Radio 
layer MAC management 
messages 

Rx Power 

The term ‘wanted signal’ refers to that of the peer unit being installed.  

In each of the states detailed above the unit should be aligned to give the highest pitch tone. 

It should be noted that if, when in the Synchronized or Registered state the tone varies wildly, 

you may be suffering from interference or a fast fading link. Installing in this situation may not 

give a reliable link. The cause of the problem should be investigated.  

For the ease of alignment both Master and Slave units use the install tones in the same way 

but with some small behavioral differences. This allows the installer to install the Slave unit 

first and carry out the initial alignment with the Master unit if desired. However due to the 

Behavioral differences of Master and Slave units it is recommended that the Master unit is 

installed first and the initial alignment carried out at the Slave unit.  

                                                      

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 The pitch of the alignment tone is proportional to the power of the received wireless signals. The 

best results are usually achieved by making small incremental movement in angular alignment.