Triple-Play Service Deployment

Chapter 5: Troubleshooting the Premises Wiring
Identifying Ethernet wiring issues
Many homes are now pre-wired with twisted pair wiring suitable for
Ethernet data services. The EIA/TIA 568A standard offers two
accepted color code standards,T-568A and T-568B.The actual wiring
and connectivity is exactly the same. Both work equally well but
they should not be mixed in the same install. Notice the difference
in Figure 5.4. A-Standard uses orange for line 2 and green for line 3
while B-Standard uses green for line 2 and orange for line 3.
T-568A Standard
1 2 3 4 5 6 7 8
3
2
Figure 5.4 T-568A and T-568B standards.
Verification of proper termination is very important. Between 75%
and 85% of the time in-home technicians spend troubleshooting
can be attributed to efforts to resolve improper terminations. The
most common termination faults can be found by a wiring verifier.
Continuity tests include verification of pin-to-pin connections and
the ability of the wire to carry a signal. The verification tester also
tests for shields and voltage on line. This is a basic connectivity test,
not a stress test.
JDSU Tri-Porter Premises Wiring Tester for
Voice, Video, and Data Installation
1
RJ-45 Male Plug
Pin 1
T-568B Standard
1 2 3 4 5 6 7 8
4 3 1
2
4
123