All fiber links are crossed over. The connectors are always the same on
stations and infrastructure equipment, so the TX output is connected to the RX
input through careful attention to the cable polarity. Check fiber for swapped
RX/TX connections when polarized or small form factor multi-fiber connectors
are not used. Figure
shows the
coaxial cable and Figure
shows
the fiber-optic cable.
If a fiber power test fails, inspect and clean
all connections on the link. While walking the cable run route, watch for
excessively tight bends and over tightened cable ties that cause micro bends.
Test fiber for power level and link indicator LEDs.
Coaxial
Cable
Problems with coaxial cable often occur at the connectors. When
the center conductor on the coaxial cable end is not straight and of the
correct length, a good connection will not be achieved.
When the center
conductor is not straight or is not the correct length, cut the coaxial cable
behind the connector end, and strip the insulation back. Make sure that the
newly exposed center conductor is straight. Before replacing the new cable
connector end, check the general condition of the cable. Make sure that the new
cable conductor end is securely crimped to the cable. The center connector
should extend 3.2 mm (1/8 inch) beyond the end of the connector.
Check that the coaxial cable end is securely screwed onto the F-connector at
the back of the cable access router. Hand-tighten the connector, making sure
that it is finger tight; then give it a 1/6 turn.