VIAVI Solutions
VIAVI Solutions
Test Challenge
The fastest and most secure test for verifying a DSL line
is performing a modem synchronization check. If the
modem does not synchronize, or the trained data rates
are doubtful, the technician must verify the copper
circuit does not contain a fault.
Application Note
Verifying Copper with
the VIAVI SmartClass TPS
Addressing the Challenge
with the SmartClass TPS
The CableCheck automatically tests the copper
circuit as a single-ended line test (SELT) to ensure
that no foreign voltage, opens, shorts, or load
coils are on the line. It also tests whether the line
is well balanced to sustain noise from interfering
with the DSL signal.
The VIAVI SmartClass™ TPS tester is the ideal tool for technicians
who install, troubleshoot, and maintain Triple-Play services.
CableCheck automates copper verification
with Pass/Fail results.
Conclusion
DSL and Triple-Play quality of service (QoS) is highly dependent on physical loop quality. The SmartClass TPS
CableCheck test sequence provides technicians with a tool that can secure easy, repeatable Pass/Fail results for
copper loop verification.
Pass Marginal Fail
AC Volts <5 V 5-10 V >10 V
DC Volts (discon.fr CO battery) <5 V 5-10 V >10 V
Resistance >5 MΩ 3.5-5 MΩ <3.5 MΩ
Opens* (depending on DSL standard) ≤15 kft/5 km >15 kft/5 km
Longitudinal Balance ≥60 dB <60 dB
Capacitive Balance
(difference T/A to G/Earth and R/B to G/Earth)
>5%
Good Ground Check
(removing one test lead, longitudinal balance expected to drop)
<30%
© 2019 VIAVI Solutions Inc.
Product specifications and descriptions in this
document are subject to change without notice.
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Copper loop issues such as foreign voltage, opens, shorts, or load coils can impact the performance of DSL and Triple-Play Services
The SmartClass TPS provides highly precise test results, including concepts like the Good Ground Check which
verifies the results provided by the Longitudinal Balance test as the user is prompted to remove one of the test
leads to verify use of a proper shield or earth/ground connection. In theory, that will create a maximum unbalanced
loop condition resulting in a significant drop in the Balance value reading.
Standard recommended values for CableCheck Pass/Fail thresholds:
• Unbalanced Loop
• Bad Contacts
• Corroded Contacts
RF Interference
• Missing POTS/ISDN Splitter
• CPE Interoperability
• Unterminated In-house Wiring
• Bridged Taps
MDF
Connection
Issues
Triple-Play
Services
*Opens limit depends on the technology and profile used. Use 3 kft/1 km for VDSL2 and 10 kft/3 km for ADSL2+.