Comba Telecom Ltd. RD-2020 Manual De Usuario

 
 

 

RD-2020 CDMA QI 

Copyright - refer to title page 

Page 10

ENU Status : 1-0-0 

 

 

The RD-2020 consists of the following modules: 
 

The FS is used to select the desired carriers and reject unwanted signals.  

 

It fulfils power amplification in both UL and DL branches.  

 

The DPX is located towards the DT and MT terminals and permits the uplink and 

downlink signals to share a common antenna. One LNA is integrated in each DPX. 
 

The Li-ion battery pack is enclosed within a plastic cover and provides back-up supply to 

the MCU to send out alarm signals in the event of mains failure.  
 

The MCU is used to monitor and control the operation of the equipment. It also 

provides the communication interface for remote control and indication. LED indicators provide the 
operation status of the MCU. 
 

The PSU converts the input voltage into a stable DC to provide power for the 

internal functional modules and to charge the internal Li-ion battery. 
 

The distribution board serves as a distributor for power and internal communication 

within the equipment. It provides connectivity to function modules, MCU, RS232 port for local control. 
 

The AC Mains surge arrestor is mounted next to the PSU and has three connections: 

VAC Live, Neutral and Ground. This provides protection to the PSU. It is assumed that the antenna system 
will have ample lightning protection. On the top of each surge arrestor is a little window with a coloured 
indicator. ‘Green’ indicates protection is available, and in the event of a fault, the colour will turn to ‘Black’. 
When this occurs, the surge protector has to be replaced. 
 
Note: When the equipment is DC powered, no surge arrestor is required.