By Housley, Trevor.
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Extra resources for Data Communications & Teleprocessing Systems, Second Edition
Serial transmission Serial transmission is by far the most commonly used method of communication. In serial transmission. the bits of the encoded character are transmitted 0 1 1 0 0 1 1 0 Source 1 0 --.... 1 '\l 1 0 1 0 / . , Receiver --- / ASCII ASCII character 2 character 1 L- Parallel by bit, serial by character Figure 2-23 Parallel transmission. 46 Basic Communications Theory Source 11101010 B 00001101 t------A-S-C-II--tl-A-S-C-II-----~I '-t------' Chap. 2 Receiver character 2 : character 1 I Serial by bit, serial by character Figure 2-24 Serial transmission.
2 logical relationship of data, and to control physical functions in terminals. The remaining six columns contain the information characters we use to encode the messages we wish to transmit [with the exception of the DEL (Delete or Rubout) character in position 7/15, which is, in effect, a control character]. Some terminals use a 96-character subset of ASCII, which means that they do not handle the lowercase characters. In these cases, if we were to transmit a code combination corresponding to one of the lowercase characters, the terminal would interpret that character as though it had its uppercase meaning.
2. This is the code that is used on the international Telex network, and it is therefore often called Telex code. The code is very widely used in private telegraph networks and among approximately 1,500,000 Telex sets that are interconnected through the international Telex network. Baudot code is a five-bit code, which means that we can represent 32 characters. This is not enough to handle a full alphanumeric character set, so we extend the character-handling capability of Baudot code by designating two of the characters as code extension characters.