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The UART chip converts serial data to parallel data that the CPU can read
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can convert analog signals to digital ones and vice versa, but they must rely on the serial ports to which they re connected for the job of converting between serial and parallel data (Figure 1710) Internal modems can handle both jobs because they have their own UART built in (Figure 1711) Table 171 shows the UART chips that have been used in PCs Phone lines have a speed based on a unit called a baud , which is one cycle per second The fastest rate that a phone line can achieve is 2400 baud MoAn external modem uses the PC s serial port dems can pack multiple bits of data into each baud; a 336 kilobits per second (Kbps) modem, for example, packs 14 bits into every baud: 2400 14 = 336 Kbps Thus, it is technically incorrect to say, I have a 56 K baud modem
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An internal modem has UART built in
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Table 171
Chip
UARTs
Description
This is the original chip selected by IBM for use in the PC It had several bugs, but IBM worked around them with built-in routines written in the PC and XT ROM BIOS This chip was developed to fix the bugs in the 8250, but the fix meant it did not work properly with the PC and XT BIOS, although it does work with the AT BIOS This chip does not work adequately at speeds at or above 9600 bits per second (bps) This chip was developed to fix the bugs in the previous chips, but still came with the interrupt enable bug contained in the 8250 chip This made it compatible with the PC/XT BIOS, and possibly also with the AT BIOS It retains the problems with rates above 9600 bps This chip was initially picked by IBM for its AT systems It should be seen as the bare minimum for its OS/2 systems; otherwise, the serial ports will not function properly This chip has a higher throughput than the previous chips and has an added scratch register to aid in speed The only drawback is that it cannot be used with the PC/XT BIOS due to the interrupt bug being fixed This chip was an improvement over the 16450, but it cannot be used for First In First Out (FIFO) buffering modes It did enable programmers to use multiple DMA channels, however This chip is not recommended for standard high-speed communication use and should be replaced by the 16550A, even though it has a higher throughput This chip has 16 built-in FIFO registers for receiving and transmitting It will increase your throughput without loss of characters at higher rates of speed, due to the added registers This is the only UART installed on today s systems
8250A
8250B
16550A
The correct statement is, I have a 56 Kbps modem But don t bother; people have used the term baud instead of bits per second (bps) so often for so long that the terms have become functionally synonymous Modern Modem Standards: V90 vs V92 The fastest data transfer speed a modem can handle is based on its implementation of one of the international standards for modem technology: the V standards Set by the International Telecommunication Union (ITU), the current top standards are V90 and V92 Both standards offer download speeds of just a hair under 56 Kbps, but they differ in upload speeds: up to 336 Kbps for V90, and up to 48 Kbps for V92 modems To get anywhere near the top speeds of a V90 or V92 modem requires a comparable modem installed on the other line and connecting telephone lines in excellent condition In practice, you ll rarely get faster throughput than about 48 Kbps for downloads and 28 Kbps for uploads
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