Establishing a Communications Link
The following
bar
graphs represent normal timing sequences
of
operation during the establishment
of
communications for both
switched (dial-up) and nonswitched (direct line) networks.
Switched
Timing
Sequence
Data
Terminal
Ready
~r--------------------------------
Data
Set
Ready
Request
to
Send
Clear
to
Send
---------'------------~~
Transmitted
Data
Nonswitched
Timing
Sequence
Data
Terminal
Ready
~r--------------------------------
~r-----------------------------
Data Set Ready
Request
to
Send
------~----------------~~
______
~-------------.L
Clear
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
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