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CONFIDENTIAL
Troubleshooting CATV
8.4 Troubleshooting CATV
Refer to Table A-1 on page A-3 for a description of the CATV cable connectivity. The
following table summarizes CATV problems, as reported by AdminBrowser if a
cable is cut or miswired.
NOTE:
Recommended minimum and maximum CATV cable lengths vary
depending upon the type of CATV cable used. Refer to the note on page 8-5.
Table 8-10
Summary of CATV Cable Wiring Problems
Type of
problem
Message Icon Icon
a
Impact
Wire 1 or 2 cut None High phase noise, degraded signal on both
Downlink and Uplink (high bit error rate)
Wire 3 or 6 cut • No communication with RAU n RAU unable to communicate with Hub,
degraded performance or RAU off-line
Wire 4 or 5 cut • Port n UL RF path loss is too high Increased ripple in the uplink path,
decreased UL gain, or no UL gain
• Port n UL RF path loss is higher than
recommended
Wire 7 or 8 cut • The DL RF path loss is too high Increased ripple in the downlink path,
RAU off-line
• The DL RF path loss is higher than
recommended
Wire 1 to RJ-45
pin 3 or 6 • No communication with RAU n RAU unable to communicate with Hub,
RAU’s RS-485 port damaged, degraded
performance or RAU off-line
Wire 1 to RJ-45
pin 4, 5, 7 or 8 • RAU n over current RAU will not power on.
Wire 2 to RJ-45
pin 3 or 6 • No communication with RAU n RAU unable to communicate with Hub,
RAU’s RS-485 port damaged, degraded
performance or RAU off-line
Wire 2 to RJ-45
pin 4, 5, 7 or 8 • RAU n over current RAU will not power on
Wire 3 to RJ-45
pin 4, 5, 7 or 8 • No communication with RAU n RAU unable to communicate with Hub,
degraded performance or RAU off-line
Wire 6 to RJ-45
pin 4, 5, 7 or 8 • No communication with RAU n RAU unable to communicate with Hub,
degraded performance or RAU off-line