DOCSIS Proactive Network Maintenance (PNM)

What Is PNM All About?

DOCSIS Proactive Network Maintenance (PNM) is a relatively well known DOCSIS feature, based and built on DOCSIS pre-equalization. Pre-equaliztion is a feature available to DOCSIS cable modems invented with DOCSIS 1.1 standard and improved with DOCSIS 2.0 and DOCSIS 3.1. This feature set is based on equalizer taps available in the cable modem. Equalizer taps do delay RF frequencies. Each unit of delay is called a tap.

  • PNM is a proactive approach to cable operator plant maintenance

  • PNM uses cable modems and CMTS as test probes

  • PNM locates up- and downstrream impairments

  • In an ideal scenario PNM identifies impairments before they impact the customer


How Does PNM Work?

  • Frequent and continuous data collection from CMTS and modems via SNMP

  • Frequent monitoring of modems in target

  • Analysis of distortion signatures

  • Issue evaluation and classification

  • Calculations of distances to reflection points

  • Plot modems on a map — visual representations of known issues.

The Advantage Of DOCSIS PNM?

PNM lowers maintenance costs by first identifying the presence of RF impairments but also determine if the impairment is in-home or outside plant. It associates MAC addresses with the affected cable modems and identifies them on a business its geo-location. Now technicians can be directed to the impairment location for troubleshooting.  In general cable operators improve the quality of experience for the subscriber by ensuring quality of service offering. Cable operators can also catch intermittent issues by monitoring their systems without the expense of an expensive test hardware platform.

  • Reduced truck rolls

  • Reduced support calls

  • Reduced modem replacements

Our DOCSIS PNM Based Products

All Axiros products can be deployed and operated “On-Premises” or “as a Service”.


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FAQ | Proactive Network Maintenance

What is proactive network maintenance?

PNM is a revolutionary concept. Proactive maintenance, unlike predictive or preventative maintenance, depends on a continuous and rigorous examination of the network looking for causes of failure before they happen rather than treating network failures as routine.

What are the benefits of PNM?

PNM reduces maintenance expenditures by first discovering the presence of RF impairments, but it also determines whether the impairment originates in-home or outside the plant. It links MAC addresses to the malfunctioning cable modems and pinpoints them on a business's geo-location. Now technicians can be directed to the problem area for troubleshooting.

What problem does PNM solve?

An effective PNM program not only lowers troubleshooting costs, but it also standardizes the data collection process, automates remote problem solving, and provides an unrivalled amount of actionable network information. But more significantly, it helps to strengthen the public's confidence in cable provider services.