Atec JDSU-SC-ADSL - Manual (Page 4)

COMMUNICATIONS TEST & MEASUREMENT SOLUTIONS
4
The SmartClass ADSL can be used to verify service delivery at the provisioned bit
rates and quality levels through a quick sync check at various points along the
customer circuit (ATU-R, network interface device [NID], splice case, cross box,
main distribution frame [MDF], DSLAM). If the tester cannot synchronize with
the DSLAM, the SmartClass ADSL provides the copper tests needed to check the
wire pair for service affecting faults, or in the worst case helps find a new
serviceable pair. In addition to DVOM, the included capacitance (opens),
longitudinal balance, and load coil counter tests help identify unique ADSL
problems in the convenient CableCheck test sequence. If the delivered service is
slower than expected, the SmartClass ADSL provides resistance and opens tests to
verify the presence of service-affecting bridged taps or the balance test to assess
noise immunity.
Separately, a poorly balanced copper wire will pick up noise that contributes to
video packet loss (continuity errors). The copper wire can be checked using the
SmartClass ADSL load coil counter to count the number of service-choking load
coils on the line, as well as monitor for very high noise levels. The bits-per-tone
and SNR-per-tone graphs are handy to correlate dips in performance with
specific frequencies and crosstalk.
SmartClass ADSL also enables technicians to verify end-to-end IP connectivity
with IP PING and traceroute. Other tests include the File Transfer Protocol (FTP)
throughput test, to ensure the network supports the requested bandwidth, and
the Hypertext Transfer Protocol (Worldwide Web Protocol) (HTTP) Web test,
that identifies problems related to dedicated websites.
Measuring ADSL and IPTV Performance