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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.