[CDU]

hi all,
can anyone give a good explaination of the difference between CDU F and CDU G in Ericsson RBS equipment or what are the advantages of one over the other.Ericsson documentation does not really give a good explaination except it does show different configurations

[Pavel]

CDU-G for GSM
Double capacity combiner – supports up to
4 TRXs per two antennas or one dual polarised

With hybrid combining the CDU-G allows base
band hopping and synthesised frequency hopping.
The CDU-G is hardware prepared to support EDGE and
can handle up to 12 TRUs per cell.
CDU-G is prepared to handle 8 TRXs per CDU by
use of a future extra hybrid combiner on the path
between the dTRUs and the CDU-G.
The CDU-G is primarily designed for RBS 2106 and RBS 2206

[Pavel]

CDU-G for GSM 900 MHz
Main characteristics are:
• Up to 4 TRXs per two antennas or one dual
polarised
• No limitations on frequency planning
• Required frequency separation is 400 kHz
• Synthesiser and base frequency hopping are
supported
• Configurations with and without hybrid
combinations are possible
• Maximum 12 TRXs per cabinet when
the hybrids in the dTRUs are used
• Maximum 6 TRXs per cabinet when the
hybrids in the dTRUs are not used.
The 6 TRXs will in this configuration
occupy the CDU-G capacity
• Covers E-GSM
Rx band 880 – 915 MHz
Tx band 925 – 960 MHz

[Pavel]

CDU-G for GSM 1800 MHz
Main characteristics are:
• Up to 4 TRXs per two antennas or one dual
polarised
• No limitations on frequency planning
• Required frequency separation is 400 kHz
• Synthesiser and base frequency hopping
are supported
• Configurations with and without hybrid
combinations are possible
• Maximum 12 TRXs per cabinet when the
hybrids in the dTRUs are used
• Maximum 6 TRXs per cabinet when the
hybrids in the dTRUs are not used. The 6
TRXs will in this configuration occupy the
CDU-G capacity
Rx band 1710 – 1785 MHz
Tx band 1805 – 1880 MHz

[armand]

thanks for the info pavel , do u know what curcumstances CDU F is used in ?

[Author]

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