Atec Wavetek-SDA-5000-5500-5510 - Manual (Page 2)

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The SDA series uses a variation of the original Stealth Sweep
technology. Existing video carriers (analog, digital, or scram-
bled) are referenced when possible, eliminating any possibility
of interference to the subscriber services. Where carriers are
absent, the SDA-5500 Transceiver at the headend transmits a
sweep to fill vacant spectrum areas. To remove effects of
headend level drift, the SDA-5500 Transceiver monitors the
levels and transmits new reference information with every
sweep. This means that if the signal levels are changing in the
headend, they won't effect the sweep response measurement.
The SDA-5500 Transceiver has all of the measurement capa-
bility of the SDA-5000 Receiver, therefore the Headend
Technician can keep an eye on headend levels.
The SDA series also offers significantly faster forward sweep
speed, especially in systems that include many digital sig-
nals. The SDA is capable of referencing 64/256 QAM signal
types, so there is no need to worry about subscriber inter-
ference or injecting sweep carriers in the guard bands.
Stealth Sweep and SDA Series
Sweep Compatibility
The SDA series is completely sweep compatible with Stealth
3SR, 3ST, 3HRV, and StealthTrak SSA-1000 series meters.
The only requirement is that firmware version 9.3 is
installed in Stealth meters, and firmware version 2.0
installed in StealthTrak SSA-1000 meters. To take full
advantage of the faster forward sweep capability, all head-
end and field instruments must be SDA series.
Preparing the Network for
Interactive Services
Reverse Sweep
The SDA-5000 (with OPT 1 installed) allows simple and
practical testing of the reverse path frequency response,
regardless of the frequency (5 to 1000 MHz). And the SDA
has a built-in reverse sweep transmitter, which means exter-
nally generated carriers are not required. Furthermore, the
SDA-5500 transmitter and field receivers have frequency
agile telemetry. They can be configured to communicate on
both the forward and reverse paths.
Forward (downstream) and reverse (upstream) path align-
ment can be performed simultaneously by one person. The
operator simply indicates which screen should be dis-
played—the response from the headend to the test point, or
the response from the test point to the headend. A reverse
sweep can uncover mismatch problems, which reveal them-
selves as standing waves, or duplex filter roll-offs that can
severely hamper the quality of services in the reverse band.
Multiple User Reverse Testing
For intense reverse testing requirements, the rack mounted
Model SDA-5510 Headend Reverse Sweep Manager handles
the reverse sweep job for up to ten different technicians on
the same cluster of nodes. Using the SDA-5510 in conjunc-
tion with the model SDA-5500 Transceiver provides a full
forward and reverse sweep alignment solution. The SDA-
5510 can also stand alone in remote hub sites for dedicated
reverse alignment applications.
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