Glossary - J

J2

Japanese Signaling Level 2 (network)
Japanese standard for digital transmission at 36.312 Mbps.

JAMES

Joint ATM Experiment on European Services (ATM)
The JAMES project aims at developing a European-wide, ATM-based interconnection structure together with associated experimental services for trial purposes. JAMES will be dealing with the interconnection of national and regional research network islands, and possibly other centres of excellence.
The main focus of the project is to investigate the provision of new broadband communication capabilities to support the needs of European research networking applications. The project will concentrate on a selection of pilot applications with real broadband needs which cannot be fulfilled by existing commercial services.
By means of this project, Europe will parallel the NSFnet/MCI initiative to develop a broadband ATM-based experimental network. Interconnection with the equivalent architecture in the USA or other countries may thus be planned.
The 17 countries participating will be provided with a variety of high speed services.
In this respect, the following issues (from the operational point of view) can be considered as the scope:

• enhancement of the architecture based on the experience of the ATM Pilot
• translation of user requirements into operational quality-of-service parameters using performance measurement and traffic measurement techniques
• network management and operational procedures
• implementation, trials and fine-tuning of new broadband experimental services, both basic and enhanced
• obtain and exploit feedback from the experimental users (particularly National Research Networks) in order to enable each Network Operator to plan and prepare the launch of acceptable and cost-effective commercial services (Exploitation Plan).

Part of the ETHOS program.

JAVA (language, object, Internet)

Java is a network-oriented programming language invented by Sun Microsystems. Java is an object-oriented language specifically designed for writing programs that can be safely downloaded to your computer through the Internet and immediately run without fear of viruses or other harm to your computer or files.
Using small Java programs (called applets), HTML pages can include functions such as animations, calculators, and other fancy tricks run directly by the web navigator.

JavaScript (network, web)

open, cross-platform object scripting language developped by Netscape and SUN for HTML pages to add a functional and dynamic aspect. JavaScript code is directly written in the HTML page. It is different from Java: it is not an object language and it is less powerful.

JDK

Java Development Kit (network, ,java)
A software development package from Sun Microsystems that implements the basic set of tools needed to write, test and debug Java applications and applets.

Jitter

In ATM, the Cell Delay Variation (CDV).
In a more general context, this is the variation of a frequence supposed to be stable.

JPEG

Joint Photographic Experts Group
One of three industry organizations developing standards and specifications for the encoding and transmission of photographic images over various media and network technologies. (see MPEG, Px64).

JTC

Joint Technical Committee

JTM

Job Transfer Manipulation
Set of ISO protocols (Layer 7) used to manipulate remote jobs between computers.

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