User's Manual
www.trilithic.com
www.trilithic.com
Page IV-37
802 AWE Operation Manual
Advanced Wireless Test Set
Ethernet TDR
The Ethernet TDR function of the 802 AWE device
transmits a test pulse of known amplitude (1V) down
both Channel A and Channel B (twisted pairs 1,2
& 3,6) of an attached cable. The transmitted signal
travels down each pair of cables and reects from
each cable imperfection, fault, bad connector and the
end of the cable itself.
After the pulse transmission, the 802 AWE measures
the return time and amplitude of all these reected
pulses and displays the following measurement
values:
• Ref – This is the distance to a fault measured in meters with an accuracy of ±1m.
• Imp – This is the impedance type of the detected fault. The values that can be displayed
within this eld are as follows:
• Open – This is a non-terminated twisted-pair whose ends are not in contact with
each other.
• Short – This is a non-terminated twisted-pair whose ends are not in contact with
each other.
• Terminated – This is a properly terminated twisted-pair.
• No Info – This is some other type of impedance mismatch.
The 802 AWE is capable of recording up to ve reections within each tested pair. In a
situation where more than 5 reections are recorded, the 802 AWE will only display the last 5
recorded reections.
Fault Detection
When using a terminated cable:
• Open peaks are cable faults (open / short to shield / strong impedance match)
• All other peaks are impedance mismatches (according to their values)
When having open peak followed by additional peaks:
• The open peak is a cable fault (open / short to shield / strong impedance match)
• The additional peaks are either end of cable or impedance mismatches (according to
their values)