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CE4000 Cable Explorer TDR
User Manual
34
Loss (RTL). RTL is the ratio of the reflected signal to the
transmitted signal in dB. A 20 dB return loss means that the
reflected signal is 20 dB down from the transmitted signal.
Manufacturers provide Return Loss specifications for most RF
components.
OPEN
SPLICE
CORRODED
CONNECTOR
WET SPLICE
SHORT
TAP OR
SPLITTER
CABLE KIN
K
WATER
INGRESS
DIPLEXER
OR TUNER
Figure 3-4
TRACE SIGNATURES
The TDR trace can be interpreted beyond the typical open and
short condition. Cable impairments and components on the
network have characteristic traces or signatures, representing
both good and bad performance. Figure 3-4 gives examples of
typical trace signatures for common cable faults and components.
Some variation should be expected in component signatures.
Technicians should note the characteristic trace signature of
good components as they use the TDR to recognize the bad
traces when testing similar components. Remember that the
cable under test has loss, which increases with distance, so the