Справочник Пользователя для Andrew Wireless Innovations Group RPT-NODEC1943

 

User’s Manual for Node C Network Elements

 

Page 72 

PRELIMINARY M0121A1A_uc.doc

 

 
Filters are set automatically according to the channels set in “Setup Wizard” or 
“Technician Setup”. For further information about these menus refer to chapters 
4.2.4.1 and 4.2.4.3. 
 
Possible filters are: 

5  10  

15 

 

5 

5 

5 

MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and 

   

,       

,      

     

 

 

 

 

 

 

 
 

One 
WCDMA 
channel 

 two adjacent 

WCDMA 
channels 

 three 

adjacent 

WCDMA 
channels 

 two 

WCDMA 

channels; 
intermediate channel 
not used 

 

 
Digital ICE has been developed to enhance antenna isolation. This feature enables 
the Node C to provide coverage in areas where effectivity is decreased due to 
physical site limitations which cause insufficient antenna isolation.  
 
Antenna isolation is the RF loss measured between the donor antenna and the 
coverage antenna. If the gain of the network element exceeds the path loss, 
feedback in form of oscillation occurs. The isolation is usually dominated by the direct 
path loss from one antenna to the other, but reflections can contribute to or even 
affect antenna isolation. Digital ICE cancels the signal from the primary feedback 
path, thus allowing the gain of the network element to be increased. 
 
The required delay resulting from the on-site conditions is measured by the DCM 
module and set accordingly. 
 
For software setting commands please refer to the online help screens.  
 
The Digital ICE function can be enabled or disabled in the “Technician Setup” page 
(see chapter 4.2.4.3). Isolation and gain margin* can be checked in the “Status and 
Reports” menu accessible via the home page of the web interface (see figure 4-4).  
 

* gain margin = antenna isolation minus Node C gain