Hunter training curriculum - the impariment detection process

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Slide 1

Hunter Training Curriculum Impairment Detection Process March 8,2010

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At a high level there are five steps required to quickly locate the impairment How we do it Determine which node that you need to work on – this is accomplished with the Client. Physically go to the selected node, connect to the network using Quiver – and measure the time distance to the problem (simultaneously determining which leg the problem is on). Using Quiver Navigator software, compare this exact measured result determined by Quiver, to a database containing time distances to all the network devices – in order to identify candidate devices. Troubleshoot to the exact device by going to split-points deeper in the network and repeating process #’s 2 and 3 until a single exact device is identified. Confirm fix using headend view.

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Finding problems step 1 At the headend, Hunter continually and sequentially scans every node for CPD.

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Node WA105 – Hunter Process Step 1 is to use the Hunter client software and select a node that needs attention. Here we identified node WA105 as having high level, consistent CPD with critical CNR alarms. Hunter measured one CPD impairment 151.65µs away from the headend. The next step is to go to the node to troubleshoot the impairment.

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Finding problems step 2 When at the node, connect Quiver as shown. It is important to connect to all outputs to get the proper direction. In the provided example the time distance is 1.11µsec

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Node WA105 At the node we used Hunter’s handheld radar, the Quiver, to isolate which leg the intermodulation was coming from. We found the impairment on the trunk going west 7.11µs away from the node. Approximately 3128 feet away. (Step 2 of the process)

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Node WA105 We input the 7.11µs into the Quiver Navigator map software, we analyzed our next stop. After skipping 2 network splits and a network amplifier we stopped at directional coupler DC0011. Using our QTP-20 probe on the thru leg of the DC, we measured the CPD 2.11us away, coming from the east leg.

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Node WA105 We then input the measured 2.11µs into the Quiver Navigator at device DC0011. the maps showed that the impairment could be coming from either side of splitter SP0005. We stopped at that splitter and measured CPD 1.43µs coming from the south.

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Node WA105 (minor segue on how to connect Quiver to various devices)

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Node WA105 Using Hunter, it took us 3 stops in 30 minutes to find the impairment. During the process we didn’t take the network down.

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Node WA105 – results of this effort So we fixed a CPD problem, what did this change? Before After

Summary: This presentation provides a step by step example of the process employed to find impariments in the field

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