Product Manual

© MiMOMax Wireless Ltd
Tornado Product Manual
13
3 TORNADO RADIO UNIT OVERVIEW
3.1 CONNECTORS
Error! Reference source not found. shows each of the different connectors The Ethernet connectors are 10/100 Base-Tx
connected to a two-port switch (either port can be used). The operating input voltage range of the power supply is 10.5 to 64
VDC. The power supply must be able to supply at least 30 watts.
Warning: Do not power up the radio unit without a load (attenuator or antenna) connected to each of the N
connectors. Damage to the radio may occur otherwise.
Connectors
Each radio unit can operate as either a Base Radio Unit (BRU) or Remote Radio Unit (RRU) as part of a Multi-point Digital
Link (MDL) system or alternatively as a NDL unit as part of a Network Digital Link (NDL) system. The actual mode of operation
will depend on the Software Feature Enablers (SFEs) purchased and the product type configured.
A MDL system consists of one BRU, tuned to one Tx/Rx frequency pair, with a number of RRUs, all tuned to the corresponding,
but opposite, Tx/Rx frequency pair. An NDL system consists of one ‘master’ NDL unit tuned to one frequency pair with its
corresponding ‘slave’ unit tuned to the opposite pair.
MiMOMax Tornado radios consist of the following modules.
• Digital Processing System (DPS)
• Transceiver (TRCVR)
• Duplexers (DPLXR)
These modules are described in detail in the sections that follow.
User data (Ethernet or serial) passes from the various interfaces into the Digital Processing System (DPS) where
sophisticated processing takes place to code the data into a MIMO signal. This MIMO signal is created completely digitally
inside the DPS. The DPS then generates two signals at an IF frequency. There are two signals because ultimately the
signals will pass onto separate elements on the antenna. The Intermediate Frequency (IF) signals are then passed on to
the Transmitter module which mixes the signals up to the desired frequency and also amplifies the signals to the required
levels. The signals then pass through the duplexers. The duplexers are special filters which prevent the transmitted signals
from feeding back into the receiver module. Next the signals are fed to the antenna.
The antenna is a special MIMO antenna which is able to transmit and receive on both the vertical and horizontal polarisations
at the same time. The MIMO antennas are essentially two antennas in one.
On the receive path, the radio signals are picked up by the MIMO antenna and fed through the duplexers and into the receiver
module. The receiver selects the radio frequency to receive and mixes this signal down to an IF. This IF signal is then
sampled by Analogue to Digital Converters (ADCs) on the DPS module. The DPS module then performs very complex MIMO
processing to decode the user data that was sent. This data is then passed to the appropriate interface.