Triple-Play Service Deployment

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Fault Common Cause Diagnosis
Good Cable
Opens
An electrical 1. Are man-made
discontinuity 2. Occur in some type of
(break) in one or enclosure
both wires in a pair 3. Are either fully open or
partially open
Shorts
An electrical connection 1. Insulation breakdown
between conductors of 2. Physical damage
the same pair or any wire 3. Faulty installation
in the shield (staple punctures, nicked
or cut cable, etc.)
Mis-wire
A wire or both wires of a 1. Man-made
pair not connected to 2.Typically appear at the
the correct pins at the termination point
other end on the cable
Split Pair
An error in the twisting 1.Terminated in the wrong
of the wires within order
the cable 2. Improper pulling technique
3. Kinked and twisted cables
Figure 5.5 Verification tester identifies common cable faults
Chapter 5: Troubleshooting the Premises Wiring
For higher bandwidth applications and for high reliability
communications, additional wiring testing or certification is
needed to ensure that the service can be carried properly.
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8
T567A/B Passing Cable (unshielded)
x
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(1 not twisted with 2; 3 not twisted with 6)
PASS
12345678 ID
12345678 1
Cable OK-53ft
OPEN
FAIL
12345678S ID
345678 1
SHORT
FAIL
12345678S ID
123456xxS 1
Short 78
MISWIRE
FAIL
12345678S ID
12345678S 1
SPLIT WIRE
FAIL
12345678S ID
12345678S 1
Split 1236