| Below is a list of articles with the most recent ones listed first. |
 |
|
Serial Communications - part 1 by MDofPC |
Topic: Serial Communications |
| The need to communicate between distant computers led to the use of the existing phone network for data transmission. Most phone lines were designed to transmit analogue information - voices, while the computers and their devices work in digital form - pulses. So, in order to use an analogue medium,... |
| Published: Saturday 28 April, 2007 |
|
|
Serial Communications - part 2 by MDofPC |
Topic: Serial Communications |
| Communication channels like telephone lines are usually analogue media. Analogue media is a bandwidth limited channel. In the case of telephone lines the usable bandwidth frequencies is in the range of 300 Hz to 3300 Hz. |
| Published: Saturday 28 April, 2007 |
|
|
Serial Communications - part 3 by MDofPC |
Topic: Serial Communications |
| The first of many bottlenecks in the stream of data is at the UART (Universal Asynchronous Receiver/Transmitter), the chip which controls the connection between the serial port and the PC's bus system. |
| Published: Saturday 28 April, 2007 |
|
|
Serial Communications - part 4 by MDofPC |
Topic: Serial Communications |
| Nearly all modems now include some sort of fax capability and usually come with bundled software which provides a PC with most of the functionality of a fax machine. Digital documents can be converted to analogue, ending up as an image file (if the receiver is another fax/modem), or a printed docume... |
| Published: Saturday 28 April, 2007 |
|
|
Serial Communications - part 6 by MDofPC |
Topic: Serial Communications |
| Over the years, modem standards have tended to develop in a rather haphazard way. As well as defining the speed at which a modem may operate they determine how, exactly, a modem compresses data and performs its error control. |
| Published: Saturday 28 April, 2007 |
|
|
Serial Communications - part 7 by MDofPC |
Topic: Serial Communications |
| 1997 saw the arrival of the 56 Kbit/s modem, despite the absence of any international standard for this speed. The K56Flex group of companies, including 3Com, Ascend, Hayes, Motorola, Lucent and Rockwell, used Rockwell chipsets to achieve the faster speed, while companies like US Robotics used its o... |
| Published: Saturday 28 April, 2007 |
|
|
Serial Communications - part 8 by MDofPC |
Topic: Serial Communications |
| The V.90 standard is neither x2 nor K56Flex, although it does use techniques from both. It is actually two standards in one, the specification defining "a digital modem and analogue modem pair capable of transmitting data at up to 56 Kbit/s downstream and up to 33.6 Kbit/s upstream. |
| Published: Saturday 28 April, 2007 |
|
|
Categories
Basket
