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In that year, at the World Trade Organization Biannual Conference called "Financial Solutions to Digital Divide" in Seattle, the term "Meaningful Broadband" was introduced to the world leaders, leading to the activation of a movement to close the digital divide. Modern devices use an integrated circuit called a UART to implement a serial port. In particular, since many devices do not use all of the 20 signals that are defined by the standard, connectors with fewer pins are often used. Signal Ground is a common return for the other connections; it appears on two pins in the Yost standard but is the same signal. If it is necessary to connect two DTE (or DCE) devices together, a cable with reversed TX and RX lines, known as a cross-over, roll-over or null modem cable must be used. 8P8C connectors are also used in many devices. The termination resistors are needed to suppress reflections as well as return the bus to its recessive or idle state. A receiving node may transmit a recessive to indicate that it did not receive a valid frame, but another node that did receive a valid frame may override this with a dominant. The distinction between CAN base frame format and CAN extended frame format is made by using the IDE bit, which is transmitted as dominant in case of an 11-bit frame, and transmitted as recessive in case of a 29-bit frame.

The CAN standard requires that the implementation must accept the base frame format and may accept the extended frame format, but must tolerate the extended frame format. Serial ports are very common on most types of microcontroller, where they can be used to communicate with a PC or other serial devices. On devices like modems, bytes may be more than 8 bits long because they may be individually padded out with additional start and stop bits; the figures below will reflect this. Devices are divided into two categories: data terminal equipment (DTE) and data circuit-terminating equipment (DCE). For example, with 8-N-1 character framing, only 80% of the bits are available for data; for every eight bits of data, two more framing bits are sent. The first telegram in the United States was sent by Morse on 11 January 1838, across two miles (3 km) of wire at Speedwell Ironworks near Morristown, New Jersey, although it was only later, in 1844, that he sent the message "WHAT HATH GOD WROUGHT" over the 44 miles (71 km) from the Capitol in Washington to the old Mt. Clare Depot in Baltimore. The US, however, continued to use American Morse code internally for some time, hence international messages required retransmission in both directions.

Morse and Vail developed the Morse code signalling alphabet. At least some Morse code training software used a code key connected to the serial port to simulate actual code use; the status bits of the serial port could be sampled very rapidly and at predictable times, making it possible for the software to decipher Morse code. Serial computer mice may draw their operating power from the received data or control signals. A common commercial application of this principle was for some models of uninterruptible power supply which used the control lines to signal loss of power, low battery, and other status information. The term "fly-by-wire" implies a purely electrically signaled control system. The term became popularized through the 1990s as a marketing term for Internet access that was faster than dial-up access (dial-up being typically limited to a maximum of 56 kbit/s). The Printer Access Protocol (PAP) was the standard way of communicating with PostScript printers. Server computers may use a serial port as a control console for diagnostics, while networking hardware (such as routers and switches) commonly use serial console ports for configuration, diagnostics, and emergency maintenance access. The EIA/TIA-561 standard defines a pinout using this connector, while the rollover cable (or Yost standard) is commonly used on Unix computers and network devices, such as equipment from Cisco Systems.

When DMX512 was ratified, many of these manufacturers then issued firmware updates to enable the use of DMX512 control on their existing equipment by the use of a simple adapter to and from the standard 5-pin XLR style connector. Either type of connector can be mounted on equipment or a panel; or terminate a cable. To interface with these and other devices, USB-to-serial converters can quickly and easily add a serial port to a modern PC. In computing, a parallel port is a type of interface found on early computers (personal and otherwise) for connecting peripherals. Modern consumer personal computers (PCs) have largely replaced serial ports with higher-speed standards, primarily USB. Modern Cable Television Technology. In modern serial ports using a UART integrated circuit, all these settings can be software-controlled. The exact voltages for a logical 0 or 1 depend on the physical layer used, but the basic principle of CAN requires that each node listen to the data on the CAN network including the transmitting node(s) itself (themselves).

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