The arguments used with ttcp are identical to those used with btcp, with the exception that -tcpAcknow has no meaning. This is because ttcp sends an ACK for every packet it receives.
-tcpSlowstart=<integer> -tcpTimer=<integer> -tcpTimerAuto -tcpTrace=<integer>[:<integer>]
See Section 3.5.3 for information on these options.