IBM AT 5170 Technical Reference page 419

Establishing a Communications Link
The following bar graphs represent normal timing sequences of
operation during the establishment of communication for both
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switched (dial-up) and nonswitched (direct line) networks.
Switched Timing Sequence
Data Terminal Ready
Data Set Ready
Request to Send
Clear to Send
Transmitted Data
Nonswitched Timing Sequence
Data Terminal Ready
Data Set Ready
Request to Send
C I ear to Send
Transmitted Data
The following examples show how a link is established on a
nonswitched point-to-point line, a nonswitched multipoint line,
and a switched point-to-point line.
Communications 8-5