Atec Wavetek-SDA-5000-5500-5510 - Manual (Page 3)

Portable Reverse Sweep Manager
The portable version of the SDA-5510 allows technicians to
install a multiple user Reverse Sweep Manager in locations
where it is not practical to install a rack mount unit. The
SDA-5000 with OPT 6 provides all the functionality of the
SDA-5510, but in the rugged SDA-5000 field unit package.
Applications include installation in systems where reverse
traffic is received by an ATM/SONET/SDH network rather
than returning to the headend, or any condition that pre-
vents rack mount installation or access to a headend/hub
site (Note: Forward sweep capability not included with
SDA-5000 with OPT 6).
Seeing Headend/Hub Site Accumulated
Ingress in the Field
The reverse noise feature of the SDA-5000 enables easy
reverse path noise testing. The operator simply presses the
"Noise" soft key while reverse sweeping, and the display
changes to a noise/ingress response indicating the noise
level over the entire reverse path spectrum measured at the
headend or hub site. All SDA Transmitters provide feedback
to the field regarding the current condition of noise and
ingress in the headend, even when noise or ingress is
"swamping" the telemetry (broadcast mode). A "picture" of
the headend noise/ingress is sent out to the SDA Receiver
via a special forward telemetry carrier.
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QAM View Ensures Quality Forward Path
Digital Services
For measurement and analysis of digital TV and forward
modem signals, the new digital QAM View option provides
a full complement of digital quality measurements.
Included is a 64/256 QAM constellation display with zoom,
average digital power level, Bit Error Rate (BER), 21 to 35
dB Modulation Error Ratio (MER), and a noise margin
"cliff effect" parameter. An equalizer display shows equalizer
stress and distance to fault.
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In addition, an exclusive noise mode allows technicians to
see ingress/noise under an active digital carrier. This tool is
invaluable for detecting forward path ingress otherwise hid-
den by conventional spectrum views!
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In-Service Cable Modem Analyzer
For "bursty" digital signals such as TDMA technologies
used on cable modems for reverse services, the SDA-5000
offers two measurement choices. The first, a one-button
cable modem analyzer test, quickly shows carrier-to-noise
measurements. The second, an advanced Zero Span feature,
utilizes a time domain display to allow power measure-
ments while the modem is in service. Both methods are
compatible with global cable modem standards.
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