• Our Technology

Our Technology

Our advanced, state of the art technology is what sets our products way above the competition. Designed by a team of scientists, engineers and developers, our innovations are key to our success.

OFDM (Orthogonal Frequency Division Multiplexing) physical layer
OFDM is the most efficient radio physical layer for long-range, non-line of sight broadband wireless access. OFDM uses orthogonally arranged multiple carriers to transmit data and achieves very high multipath resistance. Our coded, 64-FFT OFDM implementation is designed on a single baseband ASIC (Application Specific Integrated Circuit) and supports a raw data rate of 54 Mbps. Resilient to interference, multipath effects, fading and Doppler shifts, this technology has been successfully tested and implemented in the harshest environments .

Adaptive Modulation and Coding Technology
Adaptive Modulation is a smart, automated technique to maintain a radio link even through conditions that would cause a regular wireless data link to fail (severe fading, multipath, interference, obstructions, etc.) When adverse radio conditions occur, the Adaptive Modulation engine detects the signal degradation and automatically shifts down the modulation mode to a lower-rate, but more tolerant modulation mode. Our AMOD engine supports eight different modulation and FEC (Forward Error Correction) coding rates and automatically switches between them to maintain a reliable link. Implemented in hardware, the AMOD engine can switch modulation modes independently between uplink and downlink and between individual timeslots.

High power, multiband ultra-sensitive radio transceiver devices
Our radio units are all equipped with highly linear integrated transceivers that deliver the great performance demanded from a multipoint access system. In any wireless system, one of the most important things to providing reliable coverage is the radio link budget between base station and subscriber radio systems. Our systems achieve this with increased transmit power (up to 1000mW) and superior receive sensitivity without inefficient, noisy external amplifier devices.

Smart MAC (Medium Access Control) Layer software
A very important aspect for operators is ability to put a large number of simultaneous users on their networks – a factor that will directly influence their profitability. Many of our competitive systems are based on an inefficient multipoint access layer – the MAC. This unorganized access works fine with small numbers of users connected – usually 20 and less. As more nodes join, the inefficiency of the protocol starts to show as network performance drops dramatically and in many cases, to unacceptable levels. Our system features an advanced, token-passing scheduling MAC protocol which allows maximum simultaneous user connections – as high as 512 per sector - without performance loss.

Ethernet-based networking model
Our systems operate as layer 2 Ethernet bridges and layer 3 systems. This allows maximum flexibility for the operators who may use various models of access for their subscribers. With this approach, this flexibility is made easy and simple. The system supports advanced features such as VLAN tagging, QoS support, and network loop detection.

Multi-Segment transparent Bridging
With our advanced technology you can bridge traffic between different network segments, for example between Ethernet, Wireless #1 (network created in radio A) and Wireless #2 (network created in radio B) to build large networks, the Netkrom OS also lets you filter the traffic you want to pass through the networks.

Single-Segment transparent Bridging
Seamless bridging of two physical networks as if they where joined by a cable is possible by using Access Point - AP Client and WDS modes. Not a single PC or device on both networks will need any kind of reconfiguration.

Routing
With the Netkrom OS you can define the route a packet should take from a subnet to get to another subnet by adding in its internal static routing table the most appropriate path. The Netkrom OS static routing panel provides management tools for manipulating any of the routing tables (it can create up to 252 routing tables). Operations include displaying routes or the routing cache, adding routes, deleting routes, modifying existing routes, and fetching a route and clearing an entire routing table or the routing cache.

The Netkrom OS, as every Linux-based device is framed by a multiple routing table system providing a flexible infrastructure on top of which the administrator can implement policy routing. As said, beyond the two commonly used routing tables (the local and main routing tables), the kernel supports up to 252 additional routing tables.

Advanced element management software
Broadband wireless networks do not differ much from their wired counterparts in the need for effective management, while their geographical dispersion of nodes contributes to their complexity. To enable simple, centralized, and effective management we have developed a NMS (Network Management System) application suite which offers all tools necessary to successfully and easily run a broadband wireless network. The Netkrom NMS is a set of client/server GUI applications, featuring an SQL database for storage of all data, management of elements (base station units, subscriber units, encryption keys, etc.), comprehensive alert, drill-down performance reporting, and real-time monitoring. Client, server and database applications all run on the standard Windows platform and thousands of elements can be supported by a single server. The software is an entirely graphical, point and click interface with quick access to all features.

Bandwidth management
Network bandwidth is the amount of data that can be transmitted on a network in a particular amount of time. Netkrom OS helps identify and alleviate network bottlenecks by administering the bandwidth with great detail. With network bandwidth management you can, for example, define how much bandwidth (upload and download) you want to assign to single user or to a complete network segment. The network bandwidth management also lets the administrator limit and control peer-to-peer (P2P) traffic.

For each IP packet that Netkrom OS will forward, the properties of the packet are checked to see if there is a Bandwidth Management rule that it matches with. Once a rule is matched, Netkrom Router checks whether the Shaped Host has exceeded its rate limit. In case rate limit has not yet been reached, this packet will be scheduled to be transmitted with no delay. On the other hand, it is scheduled to be transmitted later, in order to keep Shaped Host’s bandwidth rates.

Filtering
Filtering with Netkrom NMS not only enables network administrators to select which services he wants to deliver to the wireless network clients, but also what bandwidth can be assigned to any service in an per-user or per-segment basis. Filtering also keeps the wireless link optimized making sure that no unwanted traffic (including P2P) is consuming resources and bandwidth of your wireless network.

Firewall
The Netkrom firewall limits access between networks (for example local network and Internet) in accordance with local security policy that is defined by the administrator. This local security policy is a table of rules that the Netkrom OS uses to filter traffic. Rules can be defined using multiple properties and if met, the Netkrom OS will drop the network packet.

The most common use of the firewall is to protect networked computers from intentional hostile intrusion that could compromise confidentiality or result in data corruption or denial of service. A firewall sits at the junction point or gateway between the two networks, usually a private network and a public network such as the Internet. The firewall can also be used to limit or discard certain type of traffic passing the wireless network not just to Internet, but to other users or devices inside our local network.