YMODEM-G - significado y definición. Qué es YMODEM-G
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Qué (quién) es YMODEM-G - definición

COMMUNICATIONS PROTOCOL
YMODEM-G; Ymodem; YModem; YMODEM-1K; Y-MODEM; Y-modem

YMODEM-G         
A non-stop "streaming" version of YMODEM designed for "error-free" connections with proper flow control; the transmitting program sends packets to the receiver as fast as it can without waiting for acknowledgements. Any errors cause the entire file transfer to abort.
YMODEM         
A file transfer protocol used between modems. YMODEM was developed by Chuck Forsberg as the successor to XMODEM and was itself succeeded by ZMODEM. XMODEM used 128-byte packets, YMODEM can also use 1 kilobyte packets. Whereas YMODEM is a batch protocol, YMODEM-G is a non-stop version. File sizes are included in the YMODEM header when sending both binary and text files. Thus files transferred via YMODEM should preserve their exact length. File modification times may also be present in the YMODEM header. YModem can fall back to smaller packets when necessary but there is no backward compatibility with XModem's error detection. [Chuck Forsberg, "XMODEM/YMODEM Protocol Reference"]. (1995-02-02)
Turned g         
  • thumb
  • Gamilaraay]] text, using a rotated capital G for ŋ.
  • Turned g as a proposed symbol of the International Phonetic Alphabet.
LETTER OF THE LATIN ALPHABET
ᵷ; Turned G; ⅁
ᵷ or turned g is a letter of the Latin alphabet, formed by rotating g 180°. It is used to transliterate the Georgian letter ჹ.

Wikipedia

YMODEM

YMODEM is a file transfer protocol used between microcomputers connected together using modems. It was primarily used to transfer files to and from bulletin board systems. YMODEM was developed by Chuck Forsberg as an expansion of XMODEM and was first implemented in his CP/M YAM program. Initially also known as YAM, it was formally given the name "YMODEM" in 1985 by Ward Christensen, author of the original XMODEM.

YMODEM extended XMODEM in three ways, combining features found in other extended XMODEM varieties. Like XMODEM-CRC, YMODEM replaced the 8-bit checksum with a 16-bit cyclic redundancy check (CRC), but made it the default form of correction instead of optional. From TeLink it added the "block 0" header that sent the filename and size, which allowed batch transfers (multiple files in a single session) and eliminated the need to add padding at the end of the file. Finally, YMODEM allowed the block size to be increased from the original 128 bytes of data to 1024, as in XMODEM-1k, which greatly improved throughput on faster modems.

Forsberg built the standard with all of these features as runtime options, allowing a single protocol driver to fall back to XMODEM-CRC or even XMODEM when connecting to non-YAM systems. He believed that programmers would want to implement as many of these features as possible on any given platform. He was dismayed to find that the majority of implementations were actually providing nothing more than 1k block size with CRC-16, failing to implement the "block 0" while continuing to use the YMODEM name. The result was the release of many mutually incompatible YMODEM implementations, and the use of the name YMODEM Batch to clearly indicate those versions that did support the complete standard.