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The ZMODEM Inter Application File Transfer Protocol |
Chuck Forsberg |
Omen Technology Inc |
_A_B_S_T_R_A_C_T |
The ZMODEM file transfer protocol provides reliable file and command |
transfers with complete EEEENNNNDDDD----TTTTOOOO----EEEENNNNDDDD data integrity between application |
programs. ZMODEM's 32 bit CRC catches errors that continue to sneak into |
even the most advanced networks. |
ZMODEM rapidly transfers files, particularly with buffered (error |
correcting) modems, timesharing systems, satellite relays, and wide area |
packet switched networks. |
ZMODEM greatly simplifies file transfers compared to XMODEM. In addition |
to a friendly user interface, ZMODEM provides Personal Computer and other |
users an efficient, accurate, and robust file transfer method. |
ZMODEM provides advanced file management features including AutoDownload |
(Automatic file Download initiated without user intervention), Crash |
Recovery, selective file transfers, and security verified command |
downloading. |
ZMODEM protocol features allow implementation on a wide variety of systems |
operating in a wide variety of environments. A choice of buffering and |
windowing modes allows ZMODEM to operate on systems that cannot support |
other streaming protocols. Finely tuned control character escaping allows |
operation with real world networks without Kermit's high overhead. |
Although ZMODEM software is more complex than unreliable XMODEM routines, |
actual C source code to pppprrrroooodddduuuuccccttttiiiioooonnnn programs allows developers to upgrade |
their applications with efficient, reliable ZMODEM file transfers with a |
minimum of effort. |
ZMODEM is carefully designed to provide these benefits using a minimum of |
new software technology. ZMODEM can be implemented on all but the most |
brain damaged computers. |
ZMODEM was developed _f_o_r _t_h_e _p_u_b_l_i_c _d_o_m_a_i_n under a Telenet contract. The |
ZMODEM protocol descriptions and the Unix rz/sz program source code are |
public domain. No licensing, trademark, or copyright restrictions apply |
to the use of the protocol, the Unix rz/sz source code and the _Z_M_O_D_E_M |
name. |
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