Toshiba E-STUDIO190F Service Manual page 264

Client
Internet Fax
Toshiba
Device
The client generates random sequential numbers initially and sends them to the server. The initial
sequential numbers are synchronized with the clock and increments the counter every 4 msec.
The Server responds with an acknowledgement that increments the initial sequential number by one. The
ACK bit number is also changed to a "1" value. The "SYN" can have and identical "ACK" response for each
packet, thus, the server and the client can establish a connection.
TCP 3 Handshake General Flowchart
264
Increments No. sequentially
Server