They may lose data when a program sends data to the host faster than humans type. Some servers allow larger input buffers to support file uploads. Sometimes the terminal server software is defective and must be upgraded. Please contact the network's vendor for corrective procedures. An alternative is to install direct serial ports for users desiring to upload files.
Some systems enforce a timeout which disconnects a user after several minutes of no keyboarding.
Unfortunately, not all Unix versions support input flow control. The TTY input buffering on some systems may not adequately buffer long blocks or streaming input at high speed. In the case of a few poorly designed microcomputers, sending serial data to a tty port at sustained high speeds has been known to cause lockups, system halts, kernel panics, and occasional antisocial behaviour. When experimenting with high speed input to a system, consider rebooting the system if the file transfers are not successful, especially if the personality of the system appears altered. Setting one of these spoofing modes interferes with other protocols.