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USB-IF Compliance

The USB-IF has confirmed that ExtremeUSB technology is fully compliant with the requirements for interoperability testing. This means that designers, manufacturers and system integrators can integrate this technology into their own products, knowing that all the plug and play and multivendor compatibility benefits of USB are retained.

System Architecture

Every ExtremeUSB system is composed of two subsystems connected by a transmission line. These subsystems are the Local Extender (LEX) and Remote Extender (REX). The LEX unit is connected a downstream-facing port of a USB Host Controller or Hub; the REX unit is connected to the upstream-facing port of a USB Hub or Device. Once operational, the entire ExtremeUSB system operates like a single Generic USB Hub.

As a Generic USB Hub, the ExtremeUSB system is compatible with all operating systems that support USB Hubs and requires no additional software to be loaded.

Since the system appears to USB as a conventional hub (albeit a very long one!) it can be connected to other hubs to the full depth permitted by USB. The system can be used as the first, last or any intermediate hub in a chain. Multiple systems can also be used in parallel within a single domain — a common situation when opposite ends of a building need to be reached from central computer room or telecom closet.

The only restriction placed on the configuration is that multiple ExtremeUSB systems cannot be connected in series. If you require extra distance then this may be accomplished by selecting a more capable transmission scheme, such as fiber.

Subsystems

Icron supplies the LEX and REX subsystems in a variety of formats to suit the needs of OEM customers, distributors and end users. However, all of these variants share a common structure.

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