Telebit T3000 Reference Manual page 154

Placing a Call (continued)
If expected, did you receive a valld (ungarbled) sign-on message
from the remote site?
Sign-on procedures vary from one system to another. You
may need to press the space bar or take some other action
to
get the sign-on message. Refer to the system's operating
instructions for the appropriate procedure.
If, after taking the appropriate action, you still do not
receive a sign-on message, or the message is garbled, there
may be some problem with the interface speed between
the DTE and modem at either end, or a mismatch in the
data format,(usually parity) used between the DTEs at
each site.
Troubleshooting 7-11