WALKair 3000
Base Station Equipment
Through dual polarization, the WALKair 3000 Base Station delivers a capacity of over 1 Gbps at 112 MHz allocation.
The BS components of the WALKair 3000 system are located at the center of the cell linking the backbone and multiple WALKair Terminal Stations via Ethernet or E1interfaces.
WALKair 3000 operates in the various LMDS bands 10.5GHz, 26 GHz and 28 GHz, using the multi-carrier TDMA/FDD access method. The Base Station-Base Unit leverages FDD duplexing for varying Tx and Rx frequencies, while employing TDMA to handle traffic from up to 64 Terminal Stations per carrier. Topologies consisting of multiple BS-BUs enable the deployment of a multiple carrier scheme, providing each carrier with a 14 MHz slice of the spectrum at data rates of 34 Mbps each.
The Base Station consists of several sectors where a single cell can be covered by 4 or 8 sectors. Each sector contains up to 4 Basic Units (BS-SA). Each Base Unit comprises a carrier, IF MUX, RFU and antenna.
The Indoor Unit is located in a temperature-controlled environment. The Outdoor Unit, which includes the RF head and antenna, is located on a pole with a clear line of sight to the Outdoor Units of the Terminal Stations.
An IF-cable connects the BS-BU (in the IDU shelf) to the BS Outdoor Unit (ODU) via the IF-MUX. It supports both the uplink and downlink IF signals and provides the ODU with DC power.
Base Station - Indoor Unit
Stackable Architecture (SA)
The base station is comprised from one or more BS-SA units each can serve as a stand alone unit, or be a part of a full capacity base station. In addition the unique WA3Ks stackable architecture can support full redundancy on any systems component
The BS-SA include the modem cards with Ethernet ports for IP backbone connectivity, the NIU cards for E1 backbone connectivity and the IF module. Each BS-SA converts the IF signal to data toward the backbone via the Ethernet port or via the NIU card, and converts data to IF signals in the opposite direction towards the TSs.
IF Mux (Optional)
The IF Mux multiplexes the Tx signals from the BS-SAs and combines the output signal with a 48V DC power supply. The IF signal is sent to the RFU, located near the Antenna, via a coaxial cable, applying the reverse process for Rx signals. The IF Mux interfaces between the RFU and the BS-SAs and can connect to up to 4 BS-SAsvia the SMA ports.
The WALKair 3000 IF Mux supports both WALKair 3000 and WALKair 1000 BS-Bus for integrated deployments.
Base Station - Outdoor Units
RFU and Antenna
The RFU interfaces between the IF Mux and the Antenna. The RFU converts the IF signal, received from the IF Mux, to an RF signal. The signal is then amplified for transmission via the Antenna. The RFU is connected to the IF Mux and Antenna with a single coaxial cable.
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