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

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

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.

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.

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SDA-5000 SERIES STEALTH DIGITAL ANALYZER

Reverse Alignment mode prepares network for

cable modem deployment

Reverse ingress spectrum display

Constellation display with MER and pre/post FEC BER

In-service ingress spectrum showing CTB/CSO-inter-

modulation problems due to analog-TV channels