Black Box TS590A User Manual page 37

SOHO TESTER
Figure 5-4. Wiring diagram (shown at left) and the
tester's LCD display (shown at right) for a split pair.
O
PEN
When an OPEN exists, some conductors in
the cable you're testing aren't terminated.
The pin numbers of the unterminated
conductors will flash on the tester's LCD
display. See Figure 5-5.
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SPLIT icon