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Digital Services Activation Meter (DSAM)
www.jdsu.com/nse
QAM Ingress Mode
Detecting the presence of ingress within digital carriers on the
downstream path is nearly impossible without turning o the service.
The tightly spaced QAM carriers hide any visual presence of unwanted
forward ingress or distortions, such as composite second order (CSO)
and composite triple beat (CTB). An MER test will indicate that an
issue exists, but with the QAM Ingress mode, technicians can inspect
what is actually going on beneath the digital “haystack,” while service
remains intact. The hardware and/or software option for QAM ingress
is available for the DSAM-2000, -2300, -3300, and -6300.
The QAM Ingress test lets technicians see spectrum underneath a live digital
carrier which is usually not viewable due to the presence of the “haystack.”
Return QAM Generator
Standard on the DSAM-3300 and -6300, the Return QAM Generator is
a mobile 16 and 64 QAM transmitter. The ability to transmit a QAM-16
or -64 modulated signal back to the headend is helpful for proving line
capabilities for future data and voice channels and for troubleshooting
return path issues in the network. This option, used with the PathTrak™
RPM-3000, can identify network problems and distortions.
The ability to transmit a QAM-16 or -64 modulated signal back to the headend
is helpful for proving line capabilities for future data and voice channels and for
troubleshooting return path issues in the network.
QAM Egress Option
The QAM Egress option provides preset spectrum analysis with a
QAM signal identier that simplies nding leaks (and verifying
xes) identied by leakage monitoring systems. Also available are
an optional directional antenna for locating from a distance, and an
optional near-eld antenna for close inspection and verication of
repair work.
The QAM Egress option simplies the detection of leaks (and verifying xes)
identied by leakage monitoring systems.
AutoTest Measurements
The DSAM performs one-button Autotest measurements that let
technicians quickly and automatically check combinations of key analog,
digital, and/or DOCSIS network parameters. AutoTest may be congured
with key autotest measurements including pre- and post-FEC BER, C/N,
adjacent channel, hum, dB Delta (intermodulation limit), AGC stress
indicator, and the FCC 24-hour Proof of Performance (PoP) AutoTest.
All tests are user enabled per channel, except for adjacent channel
information and hum. The user enables chosen channels for hum in
StrataSync and the system calculates adjacent channel information on all
tests. The user can also schedule Autotests over time. Each channel plan
requires its own autotest conguration.
Scheduled tests default to the 6 hour FCC PoP interval, but users can
change the interval to t their needs. With tests scheduled at regular
intervals (for example, 15 minutes) technicians can identify disturbances
that change based on time of day. The DSAM automatically saves test
results into a new user-labeled work folder.
Location Files
It is important to eld technicians to record the location when they
are storing test measurements. Location les enable attachment of
critical information to saved les for easy sorting and reporting. The
technician enters associated location data as prompted when saving
the measurement les, and can append the les with information
such as work order number, area, amp ID, and power conguration. A
single location le (template with default entries that can be modied)
per meter will be applied to all saved measurement les. The location
categories can be custom edited and deployed using StrataSync.
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