IBM 5150 Technical Reference

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

IBM 5150 Specifications

General

Processor	Intel 8088
Clock Speed	4.77 MHz
RAM	16 KB - 256 KB
Manufacturer	IBM
Model	5150
Release Year	1981
Storage	5.25-inch floppy drives
Graphics	MDA or CGA
Operating System	IBM PC DOS
Ports	Cassette, keyboard
Expansion Slots	5