Libra 3000

The Libra 3000 utilizes the Wide-Band Orthogonal Frequency Division Multiplexing Technology and works in the 3.5GHz range. Multiple low-speed channels located in a narrow range are used for OFDM data transfer. Data are transferred through a channel chosen adaptively depending on external noise. The same technology ensures high spectral effectiveness and tolerance to pickups which are caused by the signal multipass transmission. Another plus of the W-OFDM is that the devices can work out of the line-of-sight coverage using the signal reflected, which provides the maximum coverage area. The Libra 3000 systems are designed for distributed radio networks and for combination of segments of local networks into a single network.

The Libra 3000 equipment utilizes the multi-point network topology. The Polling with Dynamic Time Allocation (DTA) is used for elimination of collisions.

The access point can be used only with external antennae. The system can be extended from one base station with an omnidirectional antenna to a 6-sector station with 60-degree antennae to provide the overall throughput of 96 Mbit.

The Customer Premise Equipment (CPE) is produced in two versions - CPE with an externally mounted weatherproof antenna, and the same device without an integrated antenna but with a connector for an external one.

The Libra 3000 supports allocation of the fixed bandwidth (CIR/MBR) for subscribers (i.e. Quality of Service) and VLAN (802.1q).

The speed characteristics and the coverage area's radius of the Libra 3000 depend on the modulation method (it's defined when the equipment is tuned) and the range width (at present there are models for 3.5 and 7 MHz).Security of the Libra system is based on encryption by the Wi-LAN phase vector randomization method on the physical channel level. Decoding can be fulfilled only on the Libra equipment with the same vector settings. Besides, the W-OFDM modulation imposes limitation on the reception equipment.