Installation Instructions

D100300-
Doc. No.
Rev.
Date
D100300-REF
1.02
2012-10-09
Damm Cellular Systems A/S, Denmark
BS411 Base Station
Page 2 of 7
The BS411 consist of the base station controller, the transceiver modules, the combiner
system and the filter system. In the receiver path a separate Tower Mounted
Amplifier/Duplexer (TMD412) is an integrated functional part of BS411.
The TMD412 is intended for mast/tower mounting. Substantially the unit is a receiver
amplifier, but can be coupled as an amplifier with build in duplex filter. Using the TMD412 in
Duplex mode needs to take into consideration the numbers of carriers and frequencies used,
in order to eliminate potential interference.
The TMD412 amplification of the received signals fully eliminates the feeder cable loss by up
to 8dBm, which gives superior radio coverage performance and link balance.
The BS411 rack contains (ref. to figure 1 and 2 on page 4-5):
Base Station Controller, BSC412.
The operating system in the BSC412 executes DAMM’s TetraFlex
®
system software and may
as well execute Tetra system software from DAMM OEM Partner.
By installing a second redundant BCS412 in the BS411 rack, reliability will be improved.
BSC412 is equipped with an internal GPS receiver giving accurate time, date and frequency
synchronization of all installed TR412’s and to allow the base station to run full time
synchronous with other base stations in a network. This is necessary for optimum cell-
reselection and seamless handover from mobiles. Missing GPS signals will cause the internal
high stability oscillator to take over synchronization.
The GPS sync input signal from a single GPS antenna may as well allow for external
synchronization in tunnels solutions and in other operational areas where GPS signals
cannot be received directly.
It is provided with an enhanced processer with the ability to handle a complete TETRA site. It
contains enhanced Ethernet LAN and WAN connections intended for Voice over IP switching.
Dongle management of software licenses can be provided via an USB port.
Power Supply, PS411.
The PS411 is connected to mains, 100 to 240VAC 47-63Hz, or -48V batteries and supply all
units in the rack and the TMD412 and beside offers -48VDC for auxiliary units and/or the
ability to charge an external battery, controlled by the External Battery Kit.
The power supply cassette has space for the necessary numbers of PS411 to supply the fully
equipped rack plus one more for N+1 redundancy.
All Power supplies have load sharing to improve reliability.
A built-in micro-controller in the PS411 allows close monitoring of all main parameters both
via the O&M interface and from the network management system. Configuration can be
stored directly in the PS411, but will normally be controlled of common configurations in the
BSC411 Base Station Controller.