This should not be a problem if all network devices implement autonegotiation in an IEEE-compliant fashion. In addition, Fast Ethernet repeaters generally implement jabber control by automatically disconnecting any port that transmits information in streams longer than 40 kilobits Kb. For Ethernet networks, the maximum frame length is bytes 18 bytes of overhead and bytes of payload.
A frame longer than bytes is often called a jabber frame. Another name for jabber is long packet error. Overview The best example of a jack in computer networking is the standard RJ jack in which a connector plug on the end of a Category 5 Cat5 cable can be inserted.
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RJ jacks are typically built into Ethernet networking devices such as hubs, switches, and routers, but some devices also allow modular jacks to be inserted and removed in order to support other kinds of connectors. Patch panels and wall plates are other examples of items that may either be hardwired with RJ jacks or allow modular jacks to be inserted into them for greater flexibility. Example of a modular RJ jack. Notes The terms connector, jack, and plug have some overlap and are often used interchangeably. Some vendors use plug to refer to the male connector and jack to refer to the female, but others use the terms male jacks and female jacks.
See Also cabling ,Category 5 Cat5 cabling ,Ethernet jacket The outer covering of cabling that protects it from physical damage. Overview A cable's jacket protects the wiring from various kinds of damage, including damage caused by. Contact with sharp edges of walls, furniture, or plenum ducts such as ventilation ducts ; by mechanical vibrations; or by mechanical stresses introduced during the cable installation process. The jacket is usually made of an insulating material, although its primary purpose is not insulation.
This function is provided by the insulation of individual wires within the jacket.
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Common materials used for cable jackets include the following:. Polyvinyl chloride PVC : This is the most common material used for cable jackets. PVC is a tough, fire-resistant material formed from resins and plastics that can withstand a wide range of temperatures. PVC cables are typically used in vertical rises, but they should not be used in plenums because PVC gives off toxic fumes when burned.
Kynar plastic polyvinylidene fluoride : This material has good fire-retardant qualities, which makes it suitable for installation in plenums, but it is several times more costly than PVC. Flamarrest: This chloride compound has high fire retardance and is suitable for plenum installations. Neoprene: This dark-colored plastic is resistant to moisture and does not degrade in sunlight. It is a good choice for use in outdoor cable runs. Polyethylene: This soft, moisture-resistant plastic has poor fire retardance and is suitable only for outdoor cable runs.
See Also cabling jam signal A signal sent by a device on an Ethernet network to indicate that a collision has occurred on the network. Overview Collisions occur on Ethernet networks because access to media usually a cable is based on contention-that is, stations on the network transmit on a first-come, first-served basis. If two stations attempt to take control of the medium at the same time and begin transmitting, both stations will detect each other's signal and realize that a collision has occurred.
The two stations then issue a jam signal, which notifies all other stations on the network of the collision. They all must wait a short period of time before attempting to transmit again. The length of time is random for each station so that the retransmissions will not cause more collisions.
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The jam signal sent by one transmitting station must start with a bit pattern of alternating 0s and 1s, followed by a bit sequence that provides a dummy checksum value for the other transmitting station. This bit sequence cannot be equal to the cyclical redundancy check CRC value for the frame preceding the jam.
Overview Java was designed to reduce the amount of time needed to build robust, scalable object-oriented applications. Portability: Java is an interpreted language that runs on any platform for which the interpreter, the Java Virtual Machine JVM , is available. The original mantra, "Write once, run anywhere," stressed Java's platform-independence and code portability. Java also includes new features such as automatic garbage collection to simplify the complex programming task of reserving and releasing memory.
Security: Java uses a "sandbox" model that implements security by running small, downloadable client-side programs called "applets" within a protected area of memory. This prevents hostile applets from adversely affecting users' systems and makes Java an ideal platform for developing dynamic Web applications that run within a user's Web browser.
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Although a full-featured programming language, this initial release was especially popular with Web developers, who used Java to build applets that could be embedded in Hypertext Markup Language HTML pages to enhance the user experience by providing interactive content. With the release of JDK 1. JDK 1. These editions are discussed in the Implementation section of this article.
The current release of Java is the JDK 1. Uses Although Java was originally designed for developing full-fledged enterprise applications, much of its initial appeal came from its ability to create applets that could be downloaded from Web sites by browsers. These applets would then run on the browser to provide interactive elements such as advanced user interfaces and exciting display elements such as rotating ad banners and animated stock tickers. As Java has grown to include more enterprise features such as database connectivity and server-side execution elements, it has evolved into a popular platform for the development of commercial e-business applications that is widely used in today's enterprise and business world.
Architecture When you write an application or applet in Java, the Java compiler takes your source code which is usually saved with the extension. Bytecode is not true machine code-it is a set of generic instructions that are not specific to any particular hardware platform or operating system. Bytecode files generally have the extension. Here is a simple example of a Java application called HelloThere. The HelloThere. When this program is compiled into the class file HelloThere.
To run the application class file , you must have a bytecode interpreter called a Java Virtual Machine JVM on the system. The JVM reads your application's bytecode and executes it by converting each bytecode instruction into a machine-native instruction or set of instructions. This translation process takes place regardless of whether the particular piece of bytecode has been previously executed. If the application is an applet, the Web browser that accesses it must have a JVM installed.
To obtain additional functionality, you can link native code to Java applications. Networking Foundations. Computer networking. Networking Bible. Wireless Networking. Recommend Documents.
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Microsoft Encyclopedia Networking by Tulloch
Color illustrated white boards with black and blue lettering. Do you know what denial of service attack means? The Microsoft Encyclopedia of Networking includes thousands of terms like these to help IT professionals and corporate developers who use or manage computer networks familiarize themselves with current and legacy networking technologies.
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