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1010-00-0472 Datasheet(PDF) 4 Page - JDS Uniphase Corporation |
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1010-00-0472 Datasheet(HTML) 4 Page - JDS Uniphase Corporation |
4 / 12 page SDA Series instruments enable one person to perform forward and reverse path alignment simultaneously. The operator simply indicates which screen should be displayed – either the response from the headend to the testpoint, or the response from the testpoint to the headend. A reverse sweep can uncover mismatch prob- lems, which reveal themselves as standing waves, or diplex 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 10 dif- ferent 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. 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” softkey 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. 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 measure- ments. 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. In addition, an exclusive Noise mode enables technicians to see ingress/noise under an active digital carrier. This tool is invaluable for detecting forward path ingress otherwise hidden by conventional spectrum views. 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, shows carrier-to-noise measurements quickly. The second, an advanced zero span feature, uses a time domain display to allow power measurements while the modem is in service. Both modes are compatible with DOCSIS/EuroDOCSIS, CBR/switched circuit telephony, and proprietary cable modem standards. 4 SDA-5000 SERIES STEALTH DIGITAL ANALYZER Zero span/time domain expert mode, showing the TDMA bursty return path cable modem power ramp of 3.5 ms Time domain view of ingress in the Zero Span mode captures elusive ingress PathTrak Field View option compares headend node spectrum with field testpoint spectrum One button, in-service C/N measurements on TDMA return path cable modem signals (DOCSIS, EuroDOC- SIS, EuroModem) |
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