The Dual Duplexer Unit for DTRU BTS (DDPU) communicates with
the DTMU through CBUS3. It performs the following functions:
Detecting and reporting VSWR alarms in the
antenna system and low noise amplifier alarms
Controlling the 16-level (in 1 dB step) low
noise amplifier gain
Detecting and reporting the transmit power at
the antenna system port
l
Detecting and reporting board temperature
l
Detecting and reporting the in-place status of
the DOCOM and frequency band information
l
Supporting online software updating
The DDPU is divided into types of
modules based on frequency bands:
l
PGSM: 890 MHz to 915 MHz (uplink), 935 MHz to 960
MHz (downlink)
l
RGSM: 876 MHz to 901 MHz (uplink), 921 MHz to 946
MHz (downlink)
l
DGSM: 1710 MHz to 1785 MHz (uplink), 1805 MHz to
1880 MHz (downlink)
A GSM900 DDPU is divided into 25 M modules in PGSM and RGSM bands. If a cell needs
to use EGSM extended parts or RGSM extended parts, it cannot use the
frequencies greater than 55 in
the PGSM band on one DAFU.
The DDPU consists of:
l
Dual LNA Control Unit for DTRU BTS (DDLC)
l
Dual LNA Unit (DLNA)
l
A passive duplexer
The relations between the three units are as follows:
The DDPU upon power-up reports its own information such as
its frequency band, software version, hardware version, and manufacturing
information to the DTMU, which will further forward the information to the
maintenance system. In addition, the DTMU will determine whether to report an
alarm according to the frequency band reported from the DDPU. If the working
frequency of the TRX is beyond the working frequency band of the passive
duplexer in the DDPU, the DTMU will report an alarm. In this case, you need to
reconfigure the working frequency of the TRX or use a DDPU with correct
frequency band to replace the DDPU in use.
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Think and Done is a very usefull blog in which you can search and find everything of your daily life you can search and find different kind of solutions tips answered and much more which you cannot find to any other website and blog you can get more and more benifits form our web blogs. we are thanks for google to gave us so much intresting facility to keep touch with our friends and public. in Our blog you can find all kind of solutions inside of our blog and must share with your friends and family neat and clean blogger with umar qurashi.
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This blog id proparty of umar qurashi be attention that donot copy any content of this blog .without permission you are not allowed to copy and paste this blog article on your website and if you do so we take action against you and you will be payable for stealing our contents.we make articles and wrote our articles on our blog so please donot copy our contents from our blog and paste it into any document or website. we shall be thankfull to you for this.
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