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If you are dealing with a chronic synch loss issue where the actual train rate and maximum attainable
rate (head room) is less than 5 to 10 Mbps, you should call T1 to disable the profile optimization
function of DSL Expresse for that port. A “standard profile” of 31.5 Mbps downstream is sufficient to
support 3HD/15HS service
Figure 141: Important areas to look at within DSL Expresse
It is important to run BLAST Test on all copper DSL and TV Installs, and to run BLAST Test, Insight,
Dsle (DSL Express) and xVu with all DSL and TV Troubles to identify any faults before starting the
repair, and afterwards to ensure the fault is resolved.
Be proactive! Do the right thing to troubleshoot and resolve the problems on the first visit. Spending
time to diagnose the problem will increase the actual repair accuracy and efficiency, eliminating your
frustration and unnecessary equipment swapping, reducing callbacks and repeats.
The biggest modem sync loss problem and train rate reduction with aerial and enc copper circuits
are Bridge Taps, if you have cleared any BT within your terminal, you must send a request to CAST-
[email protected] for possible BT removal further down the line. Typical distances (can vary with size
of customer home and/or distance to pedestal) are:
BT @ < 20m= Customer’s Home
BT @ 20 - 65m = Pedestal or Aerial Terminal
BT @ > 65m = requires BT Removal Request
Example