Ethernet slot time example
Time-division multiplexing (TDM) is a method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time in an alternating pattern. eNet™ is an innovative product that provides real-time connectivity of operations on a Ethernet local area network (LAN): to Ethernet Converter. Above example scenario shows all the possible gigabit Ethernet MAC configurations using the ZC board. PS-GEM0 is connected to the Marvell PHY through the reduced gigabit media independent interface (RGMII), which .
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Furthermore, because each participant is now in a private collision domain, his or her available bandwidth has not only been markedly increased, it was also done without having to change the link speed. Each 8-bit data byte is mapped into a bit code-group for bit-serial transmission. The Gigabit Ethernet standards development resulted in two primary specifications: There are layer-2 sniffers that can capture and display the preamble and start frame delimiter, but they are expensive and mainly used to detect problems related to physical connectivity. Views Read Edit View history.
Three data rates are currently defined for operation over optical fiber and twisted-pair cables:. Other technologies and protocols have been touted as likely replacements, but the market has spoken.
Ethernet has survived as the major LAN technology it is currently used for approximately 85 percent of the world's LAN-connected PCs and workstations because its protocol has the following characteristics:. Success with that project attracted early attention and led to the joint development of the Mbps Ethernet Version 1. The original IEEE The draft standard was approved by the Since then, a number of supplements to the standard have been defined to take advantage of improvements in the technologies and to support additional network media and higher data rate capabilities, plus several new optional network access control features.
Throughout the rest of this article, the terms Ethernet and Ethernet LANs consist of network nodes and interconnecting media. The network nodes fall into two major classes:. Throughout this article, standalone intermediate network devices will be referred to as either intermediate nodes or DCEs. Network interface cards will be referred to as NICs. The current Ethernet media options include two general types of copper cable: LANs take on many topological configurations, but regardless of their size or complexity, all will be a combination of only three basic interconnection structures or network building blocks.
The simplest structure is the point-to-point interconnection, shown in Figure: The cable in point-to-point interconnections is known as a network link. The maximum allowable length of the link depends on the type of cable and the transmission method that is used. The original Ethernet networks were implemented with a coaxial bus structure, as shown in Figure: Example Coaxial Bus Topology.
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The time clock can be periodically synchronized with a host computer over the network using SNTP protocol or Telnet commands. Custom prompts and validation logic can be uploaded into the clock. The time clock can also be configured to trigger alarms at certain times of the day. Up to four 4 optional relay outputs can be provided to control external devices. The ECFP also provides biometric validation using a fingerprint reader. Some of the significant enhancements include but are not limited to:.
A configuration file DCC. CFG provides the prompt logic and validation information. The default prompting logic can be modified by uploading a new configuration file into the clock see Prompt Logic. Operator responses are stored in a data file DCC. DAT in the clock until downloaded by a host computer.
Once the data has been downloaded it is erased from the clock memory. Because of the extreme flexibility of the configuration file the time clock can be used for many applications in addition to time and attendance. In addition, the clock may include barcode, magstripe, or RFID card reader input. The serial port can also be used for input from a serial RS device if required. It can display the 96 standard ASCII characters and 96 non-standard symbols in a 5 x 7 dot matrix font.
The cursor position is identified by a blinking box and can be positioned under software control. Display backlighting is available as an option for low light installations. The keypad is covered by a graphic overlay which allows the function key legends to be changed by inserting a new graphic between the overlay and membrane switch array.
Once a Telnet connection is established the host client can send commands to and receive responses from the time clock. For example, to retrieve the current clock TIME value:. Some commands can also be used to change a parameter value.
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