User's Manual

Site Requirements 90DIB500R41SR_FCC02 – 99.1 25
DIB-500 R4.1 Requirements concerning the operation room
Infrastructure
For specifications on the cables required, please refer to section 5.1.2 on page 32.
Responsibility for the installation, commissioning and maintenance of an
antenna system
The operating company is responsible for the proper installation, commissioning and
maintenance of an appropriate antenna system, unless this is an integral part of the
contract concluded with Rohde & Schwarz Professional Mobile Radio GmbH. An
installer who may have been entrusted with the installation/commissioning and/or main-
tenance of the antenna system is responsible for complying with all the applicable
requirements and for the metrological tests required afterwards. In addition, equipment
for protecting the antenna cables against lightning must be provided.
4.1.6 Adjustment of the GPS antenna
Each equipment rack features a separate GPS antenna connection but only one GPS
antenna is required per network element DIB-500 R4.1. For network elements made up
of multiple equipment racks, the clock and time reference signals are synchronized.
Additional GPS antenna recommended
For DIB-500 R4.1 with more than two TIB transceiver modules and controller redun-
dancy, the use of an additional GPS antenna is recommended to ensure the GPS syn-
chronicity of the entire base station in case the active controller fails.
Without GPS satellite reception the proper operation of the DIB-500 R4.1 is ensured for
one year (depending on the ambient conditions) if a GPS signal was received before at
least once.
The 24 GPS satellites in total are not positioned geostationarily. For this reason, the
location of the GPS antenna must be chosen to ensure that the reception is not
impaired/disturbed by any obstacles.
It is best to install the GPS antenna on the roof of a building. It is also possible to install
it on an upright mast with a diameter of 60 mm. Irrespective of the installation method
used, always ensure a good circumferential visibility (angle for unobstructed sight of the
sky according to the recommendations of the manufacturer). The angle of the GPS
antenna supplied is 90 °. The orientation of the GPS antenna must ensure that at least
four satellites are received.
A minimum distance of 5 m must be kept between the GPS antenna and the Tx
antenna(s) since the decoupling established must be as large as possible - especially
for carriers in the range of 393 to 395 MHz, since the fourth harmonic wave in this case
is in the range of the received signal of the GPS signal.
For specifications on the cables required, please refer to section 5.1.2 on page 32.