User's Manual

Chapter 2. Description
2.1. LibraPlus Series Products
2.1.1. Overview
The information in this guide applies to the EION "LibraPlus" series products. This chapter presents
an overview of the features and different models in the LibraPlus Series product family.
2.1.2. Proprietary Protocol
The LibraPlus uses proprietary protocols to acheive performance metrics that far exceed those offered
by traditional WiFi devices. In a point-to-multipoint network, the LibraPlus 5845 employs a proprietary
Adaptive Polling protocol to ensure an optimum distribution of bandwith to clients. In a Point-to-Point
deployment, the Denflow protocol enables the creation of a highly-secure, high-throughput wireless
link. Additional information on these proprietary protocols is located in the folowing sections of this
manual.
2.1.3. About OFDM
The LibraPlus system uses Orthogonal Frequency Division Multiplexing (OFDM) technology to process,
transmit and receive data in parallel fashion over the air. OFDM divides a wide RF frequency band
into several subchannels that work together to deliver data, similar to splitting a road into several lanes
that together can handle more traffic than a single lane.
OFDM offers many advantages, including effective use of bandwidth, resistance to interference, ability
to take advantage of multipath characteristics, and advanced error correction and recovery. Because
data is spread across all the channels, interference usually affects only a few channels rather than all
channels, and lost data can be easily recovered. Since OFDM is insensitive to interference, the amount
of ongoing tuning, adjustment and maintenance is minimized. Both multipoint networks and point-to-
point backbone systems are supported.
The following diagram illustrates the main concept behind OFDM. The available frequency spectrum
is divided into subchannels. Each subchannel is orthogonal, meaning that the peak signal strength of
each signal occurs at the null or point of minimum signal strength of its neighbor, so adjacent
subchannels do not interfere with each other. Data is carried in parallel across the subchannels.
5