Application Note
WEBSITE: www.jdsu.com/test
Verifying Copper with the JDSU SmartClass
™
TPS
Test Challenge
e 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.
Addressing the Challenge with the SmartClass TPS
e 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.
Copper loop issues such as foreign voltage, opens, shorts, or load coils can impact the performance
of DSL and Triple-Play Services
Triple-Play
Services
RF Interference
MDF
Connection
Issues
Unbalanced Loop
Bad Contacts
Corroded Contacts
Missing POTS/ISDN Splitter
CPE Interoperability
Unterminated In-house Wiring
Bridged Taps
The JDSU SmartClass TPS tester is the ideal tool
for technicians who install, troubleshoot, and
maintain Triple-Play services.
Application Note: Verifying Copper with the JDSU SmartClass TPS
2
Product specications and descriptions in this document subject to change without notice. © 2011 JDS Uniphase Corporation 30168255 002 0511 SCTPSCOPPER.AN.TFS.TM.AE May 2011
Test & Measurement Regional Sales
NORTH AMERICA
TEL: 1 866 228 3762
FAX: +1 301 353 9216
LATIN AMERICA
TEL: +1 954 688 5660
FAX: +1 954 345 4668
ASIA PACIFIC
TEL: +852 2892 0990
FAX: +852 2892 0770
EMEA
TEL: +49 7121 86 2222
FAX: +49 7121 86 1222
WEBSITE: www.jdsu.com/test
CableCheck automates copper verication with Pass/Fail results
e SmartClass TPS provides highly precise test results, including concepts like the Good Ground
Check which veries 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 signicant drop in the Balance
value reading.
Standard recommended values for CableCheck Pass/Fail thresholds :
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 (dierence 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%
*Notes: Opens limit depends on the technology and prole used. Use 3 k/1 km for VDSL2 and 10 k/3 km for ADSL2+.
Conclusion
DSL and Triple-Play quality of service (QoS) is highly dependent on physical loop quality. e
SmartClass TPS CableCheck test sequence provides technicians with a tool that can secure easy, repeat-
able Pass/Fail results for copper loop verication.