SDA-5000 SERIES STEALTH DIGITAL ANALYZER
3
Advanced digital testing
– JDSU digiCheck average power
– QAM View digital analysis with modulation error ratio (MER), pre/post FEC
BER, constellation, and exclusive noise/ingress under the carrier measurement
Sweep is the right solution
Reverse Alignment mode prepares network for
cable modem deployment
The majority of all transmission errors (including digital) are found by measuring
the frequency response of the network. Every physical error in the network that
influences the transmitted signals will be revealed in the sweep trace. This means
the sweep results are independent of transmission methods and formats.
When maintaining and setting up the HFC network, the goal is to transmit all
signals with the best noise specifications and the lowest intermodulation distor-
tion. Sweep provides the most effective and efficient tool to show the effects and
compromises of setting up the correct gain versus frequency.
Normalized sweep
Reverse ingress spectrum display
To ensure that network specifications are maintained, starting from the headend
to the subscriber, each section of the network has its own set of specifications. A
normalized sweep divides the network into easily managed sections. Each of these
network sections can be designated to an individual team or contractor and
tested to its own specifications and quality standards.
The SDA Series uses a variation of JDSU’s original market-leading Stealth Sweep
technology. Existing video carriers (analog, digital, or scrambled) 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 will not affect the sweep response measurement. The SDA-5500
transceiver has all of the measurement capability of the SDA-5000 receiver
enabling the technician to check headend levels.
Constellation display with MER and pre/post FEC BER
The SDA Series also offers significantly faster forward sweep speed than earlier
instruments, especially in systems that include many digital signals. They can
reference 64/256 QAM signal types, removing the need to worry about subscriber
interference, or injecting sweep carriers in the guard bands.
Reverse sweep
The SDA-5000 (with option 1 installed) enables simple and practical testing of the
reverse path frequency response, regardless of the frequency (5 to 1000 MHz). It
has a built-in reverse sweep transmitter, which means externally generatedcarriers
are not required. Furthermore, the SDA-5500 transmitter and field receivers have
frequency agile telemetry, enabling them to communicate on both the forward
and reverse paths.
In-service ingress spectrum showing CTB/CSO-inter-
modulation problems due to analog-TV channels
JDSU [ JDS UNIPHASE CORPORATION ]
