Redline Communications Inc. AN30 用户手册

 

 

AN-30 System User Manual 

 

 
Wireless technology has existed for many years, proving itself to be a reliable 
communication medium, primarily for long haul point-to-point applications supporting 
critical links across the country for telephony and broadcast services. With the surge of 
broadband two-way internet use, fixed wireless systems are playing an even more 
important role in supporting network infrastructures.     
 
The AN-30 system has been designed to operate in the band, which occupies the license 
exempt portion of the spectrum. This allows an operator to set up a wireless network 
without requiring formal consent from the regulatory agent. While this provides great 
advantages in terms of cost and time to market, the ease of access to the spectrum can 
bring with it undesirable effects, such as potential interference arising from other users 
exploiting the "free" band. By following the simple deployment guidelines in this 
manual, issues of this nature can be avoided.  
 
This section provides additional background material to section 6 of this manual, 
including a description of the Link Budget tool, Fresnel zone considerations, height 
calculations, interference issues and radar horizon considerations.  
 

10.3.1. 

The Link Budget Tool 

 
Redline has developed a Link Budget Tool to help characterize the range performance of 
the AN-30 system for LOS, OLOS (optical line of sight) and NLOS conditions and 
various system parameters. The Link Budget Tool can be obtained by contacting your 
Redline certified partner or system integrator.  Note the tool provides a first-order 
approximation, and does not consider the details of any specific terrain profile which may 
impact performance; rather, a generalized terrain is used in the calculations, based on 
empirical formulas approved by governing bodies such as the IEEE and ITU.  Also, the 
tool does not consider system parameter variations arising from temperature fluctuations, 
cable loss tolerance, antenna alignment errors, etc.   
 
The Link Budget Tool estimates the distance over which the system can operate at a 
desired error rate while achieving robust communication. A link is considered robust if 
the average error rate is less than 1 bit out of every 1000 million, expressed as 10

-9

, for an 

availability of 99.99%. Availability is described in more detail below.   
 
The table below describes the net data rate (after coding overhead) that can be obtained 
for each modulation type in an ideal propagation situation. 
 

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