Operating Instructions - IBM 5100 Maintenance Information Manual

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Samples
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Space
Sl S2 S3 S4 S5
Mark
I
Sample
-Interrupts
Number
134.5 bps
X 7.43 ms
Y 1.487 ms
Figure 2. Sample Sequence
300 bps
3.33 ms
0.666 ms
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M1 M2
Operating Instructions
To operate the network analysis subroutine:
1. Load DCP2 (diagnostic control program 2) and
select MDI (maintenance and diagnostics integrated)
894 with the options specified.
2.
3.
4.
5.
6.
7.
8.
9.
Press EXECUTE to load the selected MDI and to
display the MDI options.
Select the step mode and enter step 31 for 134.5 bps
or step 32 for 300 bps.
Press EXECUTE. The display then indicates the
procedure for establishing a data link with the facility
that will transmit the alternating test pattern.
Dial the remote facility and establish a voice link.
Coordinate the type of test to
be
performed and the
procedure to be used to establish the data link
(channel).
Press EXECUTE to make the IBM 5100 ready and
initiate the subroutine.
Place the answering data set in the data mode by
pressing the DATA key.
When the carrier tone is heard in the originating
data set, place it in data mode by pressing the DATA
key on that data set.
Sl S2 S3
54
S5
M3
M4 M5
I~Y-I
X
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The status displayed at the bottom of the display screen
should proceed from DS NOT READY when EXECUTE is
first pressed to NOT CLR TO SEND when the DATA key
is pressed, then to RECEIVING when the channel has been
established and data is being exchanged. If DS NOT READY
status remains after the DATA key is pressed, check that
the 5100 is connected to the telephone line. If NOT CLR
TO SEND status remains after the DATA key has been
illuminated for approximately'5 seconds, press the TALK
key, reestablish the voice link, and try again.
To return to the voice mode from the data mode, lift the
handset and press the TALK key. The tone should cease
and the voice link should be reestablished when the TALK
key is pressed on the remote data set.
Pressing ATTN while OS NOT READY or NOT CLR TO
SEND status is indicated terminates the test.
The following paragraphs describe the status messages and
provide possible causes of the DS NOT READY and
NOT CLR TO SEND messages:
DS NOT READY - Ready status was not received from
the data set because:
1.
2.
3.
4.
The data set is not connected to the telephone
line,
The data set is not in the data mode,
The data set cable is not connected to the 5100,
The 5100 is not generating the 'data term rdy'
signal properly, or
5. The data set is not operating properly.
Diagnostic Aids 3-5