File Transfer Protocols
CommStudio includes robust, time-tested implementations of the XModem, YModem, and ZModem file transfer protocols.
Each protocol implementation has been proven to interoperate flawlessly with a very wide variety of systems, ranging from mobile devices to mainframe computers.
Optimized for reliability and performance
CommStudio contains the most advanced implementation of ZModem available. You'll enjoy advanced error recovery, automatic streaming, and block size adjustment to get the fastest transfer under even the most difficult bandwidth circumstances.
The ZModem protocol was developed by Chuck Forsberg in 1986 for the Telnet packet switching network. ZModem has several important advantages over XModem and YModem:
- Variable block size allows the size of blocks to grow or shrink depending on the quality of the connection.
- Sliding window support allows the protocol to keep sending data without having to wait for an acknowledgment for each block. This results in a significant performance increase.
- Autostart makes it possible for applications to recognize the start of a new transfer, making the application easier to use.
- 32-bit CRC checking further ensures the accuracy of the contents of each file transferred.
- Auto-resume allows a failed transfer to pick up where it left off, which significantly helps the transfer of large files over bad connections.
Even though ZModem's name is similar to XModem and YModem, the protocol itself is very different and much more advanced.