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Maven DAS

At the heart of the Maven DAS, the CPRI-based high speed digital transport fabric is completely flexible. System nodes (Orion master nodes, Stratus remote nodes, Tarantula routing nodes) are interconnected to suit the system requirements, with topologies from simple star connections to full mesh interconnection supported to suit all types of application and needs for redundancy and routing bandwidth. The system software automatically registers connected nodes and adapts to provide the best routing, with deterministic routing delay allowing tight control of timing between MIMO and aggregated carriers.

Unlike some competing solutions, the Maven DAS has no central control unit: each node in the digital transport fabric coordinates with its peers to provide the required routing services. As a result, the Maven DAS has no central point of failure, and a range of redundancy and fallback options can be selected to maintain service in the event of incidents such as cable faults or power outages.

Competitor solutions require separate rack mounted units for BTS point of interface (POI), RF to digital conversion, and a digital hub / system controller. These take up valuable rack space, and require many interconnections to be fitted. The Maven Orion master node integrates all of these functions into a compact 3HU chassis, and the simple peer-to-peer topology means that Maven DAS systems can be implemented with a minimum complexity: base stations connect to an Orion master node which in turn is connected to the required number of remote nodes. Systems with more sectors can be built by connecting more Orion units as required.

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The Maven Stratus high power remote node achieves a full 20W RF output power per band in all bands supporting multi-operator and multi-standard operation from 700 to 2600 MHz. This is achieved with a power efficiency that is unequalled in existing DAS solutions, requiring less than half the power. As a result, a Stratus quad band remote unit is small and light (<25 kg) and requires no cooling fans. This is particularly important since remote units are often installed in harsh environments such as tunnels, where air filters regularly need replacing. The absence of fans, and IP66 environmental rating, make the Stratus remotes maintenance free.

The Stratus remote has excellent RF performance, with a typical uplink noise figure of 3 dB. The low noise figure allows many remote units to feed a single base station, while fast automatic gain control protects the system from abnormally high signal levels at the remote. Careful design minimizes PIM, and spectrum and VSWR monitoring allows for faults in the antenna system to quickly be detected and resolved.

Each Stratus unit supports three high-speed QSFP connections, allowing for flexible redundant ring and mesh connection topologies. In addition, 4 SFP+ connections are provided for local interconnections between remote units for MIMO installation, and give flexibility for specialized DWDM / BiDi fibre installations.

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The Orion RF Master Node is a compact 3HU rack mounted design which can be fitted with up to 8 RF band modules. Each band module has a separate RF / digital conversion function, and any combination of frequency bands can be installed, with MIMO and carrier aggregation support across multiple RF band modules.

The Orion band modules contain functionality which requires a separate POI in competing solutions: the band module supports up to 4 RF connections at up to +30 dBm input power each, with simplex or duplex connections and automatic power levelling per input.

This functionality gives unequalled installation density: a complete multi-operator multi-sector installation can be supported by a single Orion unit, or each operator can be allocated a separate band module if separation of analogue signals is desired.

The digital fabric is accessed via 4 QSFP connections, giving a total RF routing bandwidth of approximately 4.8 GHz. These fabric interconnections can be used to connect and route RF signals to any other type of node.

For high reliability the Orion unit has redundant power supplies, with simple replacement thanks to a front pull-out power supply module.

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The Tarantula is a rack-mounted unit that provides additional digital routing flexibility. Routing can be performed between six QSFP connectors; alternatively, data for 4 of the QSFP connectors can instead be routed via SFP+ modules for applications such as remote base station hotels using DWDM over limited fibre connections, or where SFP+ connection to remote units is required. The unit has redundant power supplies with simple replacement thanks to a front pull-out power supply module.

In addition to its role in the DAS routing fabric, the Tarantula is prepared for a role as a digital interface to base station baseband processing units, allowing a true multi-operator virtual RAN solution as will be discussed later.

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