Hello jumbie-ga
This article from Topfloor.com explains the fundamentals
http://www.topfloor.com/pr/newsltr/015.htm#begin
Excerpts from web.cum gives 'an example' of the file size plain text
(ASCII) vs Binary
"A - ASCII
The ASCII bytes are taken from the file in the source system,
transmitted over the connection, and stored in the file in the
destination system.
The data is the 7-bit ASCII codes, transmitted in the low-order 7 bits
of 8-bit bytes. The high-order bit of the transmission byte must be
zero, and need not be stored in the file.
The data is "NETASCII" and is to follow the same rules as data sent on
Telnet connections. The key requirement here is that the local end of
line is to be converted to the pair of ASCII characters CR and LF when
transmitted on the connection.
For example, TOPS-20 machines have 36-bit words. On TOPS-20 machines,
The standard way of labeling the bits is 0 through 35 from high-order
to low-order. On TOPS-20 the normal way of storing ASCII data is to
use 5 7-bit bytes per word. In ASCII mode, the bytes transmitted would
be [0-6], [7-13], [14-20], [21-27], [28-34], (bit 35 would not be
transmitted), each of these 7-bit quantities would be transmitted as
the low-order 7 bits of an 8-bit byte (with the high-order bit zero).
For example, one disk page of a TOPS-20 file is 512 36-bit words. But
using only 35 bits per word for 7-bit bytes, a page is 17920 bits or
2560 bytes. "
[i.e. ASCII = 2560 bytes]
"B - BINARY
The 8-bit bytes are taken from the file in the source system,
transmitted over the connection, and stored in the file in the
destination system.
The data is in 8-bit units. In systems with word sizes which are not a
multiple of 8, some bits of the word will not be transmitted.
For example, TOPS-20 machines have 36-bit words. In binary mode, the
bytes transmitted would be [0-7], [8-15], [16-23], [24-31], (bits
32-35 would not be transmitted).
For example, one disk page of a TOPS-20 file is 512 36-bit words. But
using only 32 bits per word for 8-bit bytes, a page is 16384 bits or
2048 bytes."
[i.e. Binary = 2048 bytes]
"Simple File Transfer Protocol" Network Working Group by Mark K.
Lottor MIT Sept '84
http://asg.web.cmu.edu/rfc/rfc913.html
From logical deduction (all things being equal) the Binary file will
transfer quicker due to the smaller file size, 2048 bytes Vs 2560
bytes
This is echoed by an excerpt from ucar.edu website
http://www.unavco.ucar.edu/data_support/software/binex/why_binex
"* Reading/writing binary (e.g. BINEX) is 4 to 10 times faster than
reading/writing the equivalent information in ASCII (e.g. RINEX or
Compact-RINEX). If a one-step process (see above bullet) is
implimented with BINEX, the savings in file-reading time alone is a
factor of 12 to 30."
Search Strategy:
transfer time binary vs ascii size
://www.google.com/search?q=transfer+time+binary+vs+ascii+size&hl=en&lr=&ie=UTF-8&newwindow=1&c2coff=1&start=0&sa=N
transfer time binary ascii
://www.google.com/search?hl=en&lr=&ie=ISO-8859-1&newwindow=1&c2coff=1&q=transfer+time+binary+ascii+&btnG=Google+Search
transfer time binary vs ascii faster file size
://www.google.com/search?q=transfer+time+binary+vs+ascii+faster+file+size&hl=en&lr=&ie=UTF-8&newwindow=1&c2coff=1&start=20&sa=N
I hope that helps,
kind regards
lot-ga |
