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Transmission delays are optimally matched with required function performance times in order to increase throughput.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
69% of the total text.
Page 1 of 1
Method of Handling Required Communication Delays
Transmission delays are optimally matched with required function
performance times in order to increase throughput.
When a keyboard/display unit is serving as a sending station and
communicating with a remote receiving station, such as an electromechanical
printer, character transmission must be delayed during the time required for such
functions as carrier return. These delays are normally provided for by
transmitting idle codes to consume time. A problem, as far as throughput is
concerned, is matching idle code time to actual function performance time.
Transmission of one idle code for each index, half index up, or half index down
code presents an acceptable match. This is not necessarily the case if the
number of idle codes required is at least 1.5 plus 1 for each inch of carrier travel
for both tabs and carrier returns. Even if the maximum length of carrier returns is
assumed to obtain a fairly even match, many tabs are less than one inch. Thus,
printing time is lost.
An alternative for obtaining better matches is to calculate tab and total
escapement for each tab based on cumulative character escapement and
operator set tab lengths. This requires tab stop settings to be the same at both
stations. This is definitely the best approach from a human factors standpoint
since mismatches would be minimized. However, for this to work at all,
escapement calculations must be exact. Exact escapement calculation is very