1.
25
m +
35
m =
60
m
2.
60
m x 2 =
120
m
3.
30
m +
120
m =
150
m
4.
200
m +
150
m =
350
m
To calculate the distance to the failure:
1.
Determine the time in divisions between the start
of
the + B-Gate squarewave and the reflection caused
by the failure.
For
example, sample oscilloscope signal
II
("712 Sample Oscilloscope Signals" on page 7-10) shows 6.4
divisions to the reflection caused by the open.
2.
Multiply the number
of
divisions times the length per division for the B-sweep setting shown in the
following distance tables.
Sample oscilloscope signal
II
has a B-sweep setting
of
2.0 microseconds. Therefore, the distance to the
failure would be
1267
meters for a twinaxial cable (6.4 x
198)
and
1420
meters for
an
IBM Cabling
System (6.4 x
222).
Distribution Panel
(back view)
DODO
DODO
Wiring
Closet
Work
Area
200 m
25m
~/
r-----L..,
ii
I I
I I
I I
System
Legend:
Cable
I I
I I
I I
Work
Station 1
Data
Signal Path
m
= meters
35 m
I I
I I
I I
I I
I I
I I
I I
Work
Station 2
Work
Station 3
R36B121-1
Section
7.
Local Work Station Procedures 7-9
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