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Chapter 16 Rev 10-27-87 Typeset 10-27-87 40 |
Chapter 16 ZMODEM Protocol 41 |
17. FFFFUUUUTTTTUUUURRRREEEE EEEEXXXXTTTTEEEENNNNSSSSIIIIOOOONNNNSSSS |
Future extensions include: |
o+ Compatibility with 7 bit networks |
o+ Server/Link Level operation: An END-TO-END error corrected |
program to program session is required for financial and other |
sensitive applications. |
o+ Multiple independent threads |
o+ Encryption |
o+ Compression |
o+ File Comparison |
o+ Selective transfer within a file (e.g., modified segments of a |
database file) |
o+ Selective Retransmission for error correction |
18. RRRREEEEVVVVIIIISSSSIIIIOOOONNNNSSSS |
10-27-87 Optional fields added for number of files remaining to be |
sent and total number of bytes remaining to be sent. |
07-31-1987 The receiver should ignore a ZEOF with an offset that |
does not match the current file length. The previous action of |
responding with ZRPOS caused transfers to fail if a CRC error |
occurred immediately before end of file, because two retransmission |
requests were being sent for each error. This has been observed |
under exceptional conditions, such as data transmission at speeds |
greater than the receiving computer's interrupt response capabilitiy |
or gross misapplication of flow control. |
Discussion of the Tx backchannel garbage count and ZCRCW after error |
ZRPOS was added. Many revisions for clarity. |
07-09-87 Corrected XMODEM's development date, incorrectly stated as |
1979 instead of the actual August 1977. More performance data was |
added. |
05-30-87 Added ZMNEW and ZMSKNOLOC |
05-14-87 Window management, ZACK zshhdr XON removed, control |
character escaping, ZMSPARS changed to ZXPARS, editorial changes. |
04-13-87 The ZMODEM file transfer protocol's public domain status |
is emphasized. |
04-04-87: minor editorial changes, added conditionals for overview |
version. |
03-15-87: 32 bit CRC added. |
12-19-86: 0 Length ZCRCW data subpacket sent in response to ZPAD or |
Chapter 18 Rev 10-27-87 Typeset 10-27-87 41 |
Chapter 18 ZMODEM Protocol 42 |
ZDELE detected on reverse channel has been changed to ZCRCE. The |
reverse channel is now checked for activity before sending each |
ZDATA header. |
11-08-86: Minor changes for clarity. |
10-2-86: ZCNL definition expanded. |
9-11-86: ZMPROT file management option added. |
8-20-86: More performance data included. |
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