We continually re-examine, re-engineer and refine our core technologies to keep improving the way we monitor and maintain cable networks. Our core signal correlation expertise was initially commercialized with the Xcor technology, which we used to identify CPD in the HFC network. This presented the opportunity to evolve and develop the QAM Snare, which applies a variant of the correlation process to more accurately and effectively identify leaking QAM signals. And this led us to develop the world’s first network traffic-compatible TDR based on an autocorrelation variant of the core Xcor technology. It’s our culture of sustained innovation that drives us to continually reinvent the way cable networks are monitored, diagnosed and serviced.
Xcor uses existing QAM channels as radar probing signals to calculate the exact distance to a distortion source. A reference signature is created by capturing forward QAM channels as they pass the connection point, and this reference is cross-correlated with return path signals to determine the precise distance to the impairment.
Passive radar technology
Xcor’s cross correlation process compares two signals sets to see if and when they are statistically the same. Xcor’s passive radar technology uses existing QAM channels as radar probing signals and transmits them to a CPD simulator, which creates a CPD reference signature. As these same QAM channels travel through the network, and as they pass through a nonlinear distortion source, intermodulation products are inherently created. These products will propagate in the forward and the return. We then capture signals traveling back through the return path and correlate them with the CPD reference. If the signals correlate we know with certainty that CPD exists, and we know the time distance to the impairment. What makes this technology so great is that our device noise floor is significantly lower than the system noise floor, so identifying low level or intermittent CPD is simple – and previously challenging impairments are easy to identify and repair. Traditional tools cannot distinguish CPD from noise on all-digital networks – Xcor is the only technology available able to discern the two.
HOW IT WORKS
Network traffic-compatible (NTC) Time Domain Reflectometer (TDR) transmits very low-level, non-intrusive spread spectrum signals using return path frequencies in the forward, auto-correlating the reflected signal and providing an easy-to-understand return loss indication of the entire span up to the next active – with incredible accuracy and impressive distance resolution.
time Domain Reflectometer
A Quiver with the added NTC TDR option is connected to amplifier test points or to a line passive using a test probe. The operator simply presses a button to enter TDR mode and the device transmits a short duration and imperceptible low-level spread spectrum pulse across the return band. The reflected signal is analyzed using an autocorrelation process, and the return loss is calculated for the entire cable span up to the next amplifier, pinpointing the problem source so your technician knows precisely where to go to fix it. The accuracy and resolution of Arcom’s NTC/TDR are exponentially greater than legacy TDR’s. Better still, the process does not require the network to be disconnected in order to make the measurement.
HOW IT WORKS
The most advanced and accurate leak location technique in the industry. The QAM Snare correlation process uses time delay inherent in the detection process, to provide the most precise and accurate detection and calculated GPS leak location, with no false alarms or any of the hassle traditionally associated with leakage mitigation. Simply go to the flagged GPS location and use our multipath-impervious detector to move lightning fast to the leak location – a perfect example of technology-enabled simplicity.
For QAM detection, the field unit correlates signal samples captured at the headend with signal samples captured with a local antenna on the device. When there is correlation, the detect signal originated at the headend, traveled through fiber and coax to the leak location, then traveled over air to the receive antenna. QS Technology calculates differences in time delay (TDOA) at multiple detection points to determine the precise GPS coordinates of a leak. Once identified, the leak location is flagged on a map displayed on the user’s meter, so the technician knows exactly where to start the repair process.
HOW IT WORKS
RF Filters have been our bread and butter for decades, and we still take them quite seriously. They were the building block that enabled us to expand and develop the groundbreaking technology that has reinvented the way modern networks are monitored and maintained. The current FlexAr System represents decades of incremental improvements incorporated from 100 million units plus of experience. FlexAr incorporates the most advanced computer simulation and filter synthesis programs to build the smallest size, best insertion loss, and best return loss filters in the industry. Details matter. FlexAr was engineered from the ground up to produce consistent high-quality filters designed to last in any field environment.
Inform the way you maintain your network