Trouble Shooting with ELQ 30A

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Trouble Shooting with ELQ 30A
Typical Cable Problems
CROSSTALK

BRIDGED TAPS

INTERRUPTION

UNBALANCE

NEXT Measurement
FEXT Measurement
Location of XTALK Point
Recognition of Bridged Taps
Location of Bridged Taps
Micro Interruption Detection
Location of Loose Contacts
LCL Balance Measurement
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To learn more click on the selected topic!
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Near End Crosstalk Measurement
ELQ 30A MASTER ELQ 30A SLAVE
ELQ 30A MASTER ELQ 30A SLAVE
FAIL ?
? PASS
The location of cross talk point can be found by
the TDR of ELQ 30A
To visit the TDR page click on the key
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Far End Crosstalk Measurement
ELQ 30A MASTER ELQ 30A SLAVE
ELQ 30A MASTER ELQ 30A SLAVE
FAIL ?
? PASS
The location of cross talk point can be found by
the TDR of ELQ 30A
To visit the TDR page click on the key
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Crosstalk Point Location with TDR
When the XTALK is out of limit it is very likely
that the reason is split. The best tool to locate
the XTALK points is ELQ 30A in TDRXTALK mode.
ELQ 30A Split
Resplit
Typical Waveform
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Recognition of Bridged Taps
Impedance measurement is the best tool to
recognize bridged taps because they cause
strongly waving line impedance

Typical impedance measurement result
FAIL ?
? IRREGULAR
The location of bridged tap can be found by the
TDR of ELQ30A
To visit the TDR page click on the key
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Bridged Tap Location with TDR
When the line impedance is strongly waving it is
very likely that the reason is bridged tap. The
best tool to locate it the TDR of ELQ 30A

Typical Waveform
Distance to tap Length of tap
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Micro Interruption Detection
Micro interruption is a temporary line
interruption due to loose contacts. ELQ 30A
detects the micro interruptions using 1020 Hz
test tone


The location of loose contact can be found by
long time TDR measurement
To visit the TDR page click on the key
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Loose Contact Location
ELQ 30A in long time TDR mode performs a sequence
of repeated measurements The obtained
waveforms are different if the features of tested
pair change during the test

Typical Waveform
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Balance (LCL ) Measurement
ELQ 30A in Master-Slave mode provides a useful
tool to find unbalance causing impairment of
xDSL connections.
ELQ 30A MASTER ELQ 30A SLAVE
ELQ 30A MASTER ELQ 30A SLAVE
PASS ?
? FAIL
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THANK YOU FOR YOUR ATTENTION!