d. The pulse group code groups below the letter Z in the Baudot code table make the sending and receiving
teletypewriters perform machine operations. For example, CAR RET, which stands for carriage return, returns the
carriage of the teletypewriters to the extreme left for the beginning of another line of type. LINE FEED advances the
paper page after each line is typed. SPACE moves the carriage one space for spacing between words. LTRS makes the
machines shift to type letters of the alphabet, and FIGS makes the machine shift to type numbers and punctuation marks.
Incidentally, the teletypewriters type everything in capital letters, because there is no provision in the Baudot code for
representing lower case letters.
e. The sending operator uses the BLANK key to indicate a momentary pause in the transmission of a message.
The BLANK key is also used when transmitting from American teletypewriter equipment into British equipment. The
key must be depressed at the end of the message so that the British equipment can receive the last character.
79.
Rate of Transmission in a Teletypewriter System.
a. Words per minute (WPM). It takes 22 milliseconds to transmit the start pulse, 22 milliseconds for each of the intelligence pulses, and 31
FIGURE 77. Using the Baudot Code.
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