860 DSP or 860 DSPi
860 DSP and 860 DSPi Applications
Plant Maintenance
- Signal Level Measurement, Analog and Digital - Proper Levels and Balance, Downstream and Upstream
- Carrier-to-Noise and MER
- RSVP2 - Tests to ensure that transmit levels within design specifications are received in the headend
- Cable Modem Status - verifies acquisition of downstream carrier, throughput, level, modulation, signal to noise, and error correction
- VoIP Analysis - Tests to ensure acceptable MOS, considering packet loss, latency and jitter, verifies physical layer VoIP viability
Service Installation
- Signal Level Measurement, Analog and Digital - Proper Levels and Balance, Downstream and Upstream
- Digital Measurements, BER, MER or EVM, Constellation - Not exceeding maximums according to design
- System Frequency Response (Sweep), Downstream and Upstream - Proper flatness, no suck-outs or band edge roll off
- Ingress Troubleshooting - Observe and compare headend (NOC) spectrum to spectrum at current test point
- Distortion - CSO and CTB greater than designed specification
| Test Feature | 860 DSP | 860 DSPi | Application |
|---|---|---|---|
| Digital signal analysis for QPSK and all common QAM formats from 4 to 256 QAM | QA-1 Option | Standard | Plant Maintenance Service Installation |
| Constellation diagrams | QA-1 Option | QA-2 Option | Plant Maintenance |
| MER | QA-1 Option | Standard | Plant Maintenance Service Installation |
| EVM | QA-1 Option | QA-2 Option | Plant Maintenance Service Installation |
| Calculated BER | QA-1 Option | Standard | Plant Maintenance |
| FEC (Pre & Post) | QA-1 Option | Standard | Plant Maintenance |
| Spectrum Analysis | SA-1 Option | SA-1 Option | Plant Maintenance |
| Return Sweep | SR-1 Option | SR-1 Option | Plant Maintenance |
| Enhanced RSVP | VP-1 Option | VP-1 Option | Plant Maintenance Service Installation |
| Browser | CI-2 Option | Standard | Plant Maintenance Service Installation |
| Ping | CI-2 Option | Standard | Plant Maintenance Service Installation |
| Throughput | CI-2 Option | Standard | Plant Maintenance Service Installation |
| VoIP | CI-2 Option | Standard | Plant Maintenance Service Installation |
|
SR-1 provides a view of the spectrum at the headend, along with the spectrum at the field testpoint. |
In addition to providing composite distortion information, the spectrum display shows all signals on the test point |
|
SR-1 option offers powerful reverse alignment and troublshooting tools-- alignment and ingress constellation information |
QA-1 (or 2) option provides useful constellation information on one display. |
