Co-Siting With Tdma Rbs Using An Asu; Separate Tx And Two Separate Rx Antennas - Ericsson RBS 2207 Product Description

Radio Configurations
Table 32 Expansion using CDU-G without Hybrid Combiner
8

Co-siting with TDMA RBS Using an ASU

The ASU is used for co-siting with a TDMA RBS, more specifically RBS 884
for 800 MHz and 1900 MHz, and RBS 882 for 800 MHz only. The unit allows
a TDMA cabinet to share receiver antennas with a GSM cabinet. The ASU is
installed in a dTRU based GSM cabinet.
The implementation is for 800 and 1900 MHz. The end configuration differs
for different site configurations of the TDMA RBS. One-, two- and three-sector
sites can be supported. In the case of two- or three-sector sites, the figures
below only show one part of the RBS.
8.1

Separate TX and Two Separate RX Antennas

The original antenna configuration of the TDMA RBS is TX + RX + RX. When
co-siting is configured, the antennas are moved from the TDMA RBS to the
dTRU based RBS. The dTRU based RBS can be prepared for co-siting already
at the factory. The RX paths to the TDMA RBS will go through the ASU.
By moving the receiver antennas to the dTRU based RBS, it is possible to
benefit from minimum interference with the old equipment.
Figure 22
If TMAs are used in the original configuration, they are replaced with
dual-duplex TMAs (ddTMAs).
56 (62)
3 x G18dt_2.2 (2) (2) (2)
3 x G19dh_2.4 (2) (2) (2)
3 x G19dht_2.4 (2) (2) (2)
TX RX RX
TDMA RBS
Separate TX and Two Separate RX antennas, no TMAs
3 x G18dt_2.4
3 x G19dh_2.4
3 x G19dht_2.4
TX TX/RX TX/RX
Co-sited
RX A
TDMA RBS
RX B
RBS 2106 and RBS 2206
(2) (2) (2)
(2) (2) (2)
(2) (2) (2)
dTRU Based
RBS
P008526A
EN/LZT 720 0318 Uen R5A