Reference Manual

Description 33 (37)
LRN/X-99:083 Rev F 2001-07-17 © Ericsson. Commercial in confidence
The CDU-G 1900 MHz main characteristics are:
• Up to 4 TRXs per two antennas (two physical antennas) or one dual polarised.
• No limitations on frequency planning.
• Required frequency separation is 400 kHz (due to GSM specification).
• Synthesiser and base band frequency hopping are supported.
• Configurations with and without hybrid combination are possible (with the same HW).
• 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.
• CDU-G is prepared to handle 8-TRXs per CDU by use of a future extra hybrid
combiner on the TX path between the dTRUs and the CDU-G.
7.3 GSM 1900 MHz Configurations
The configurations are the maximum configurations within a given number of CDU’s. The
single cell configuration can be duplicated or triplicated to form multicell configurations by
for instance utilising the Multi Drop functionality.
Table 13. Configurations for GSM 1900 with CDU-G without hybrids used in the dTRUs
(uncombined mode).
Max
Config
No. of
cabinets
TMA Number
of CDU’s
Number of Antennas
1
CDU
type
1x2 1 Opt. 1 (2) G
2x2 1 Opt. 2 (2)(2) G
3x2 1 Opt. 3 (2)(2)(2) G
Table 14. Configurations for GSM 1900 with CDU-G with hybrids used in the dTRUs
(combined mode).
Max
Config
No. of
cabinets
TMA Number
of CDU’s
Number of Antennas
1
CDU
type
1x4 1 Opt. 1 (2) G
1x8 1 Opt. 2 (4) G
1x12 1 Opt. 3 (6) G
2x4 1 Opt. 2 (2)(2) G
2x6 1 Opt. 3 (3)(3) G
3x4 1 Opt. 3 (2)(2)(2) G
1
The number of physical antennas is reduced if cross-polarised antennas are used.