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H2/4ACC is a prequalification/acceptance test
for HDSL2 or HDSL4 service. This service type
selection invokes a special set of sweep frequencies
as well as E, F, and G weighted wideband noise
measurements. HDSL2 and HDSL4 introduce the
Loop Attenuation measurement per ANSI T1.418-
2002 as well as wideband noise measurements.
Loop Attenuation approximates the Pulse
Attenuation metric that is measured as part of the
training sequence for HDSL2/4 modems. H4RACC
and H4NACC are specific prequalification/
acceptance tests for Repeatered and Non-Repeatered
HDSL4 services respectively. They feature Pass/Fail
analysis of swept Insertion Loss at 50kHz, 90kHz,
130kHz, and 196kHz
.
Connect the red test lead to ring of the pair, the
black test lead to the tip, and the green test lead to
ground. If the CTC SmartStrap is being used as a far
end device, also connect the yellow test lead to one
conductor of the control pair and the blue test lead
to the other conductor. Make certain that the far end
device is connected to the pair under test at the far-
end. From the Auto Menu screen, press the [enter]
key to start the Autotest.
If the 965DSP has DSL Parametric Test capability
(/SA option), and the 3M FED II has been selected
for the Far End Device, five additional service
types are available. These are HDSL2, HDSL4,
H2/4ACC, H4NACC and H4RACC.