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CQM Graphs: Difference between revisions
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→Phone line half connected - DIS in one leg
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[[File:CQM-FTTC-DIS-in-one-leg.png|none|frame|FTTC running on just a single leg/wire]]
Here we have a perfectly good FTTC, running at 80M. However, in the evening the line goes rather crazy! Here is what happened:
*18:20
**The line dropped a few times and reconnected, but the sync speed dropped to from
*The line continued working for a short while, up until:
*19:20 where a backup job was started which started uploading data
**As the sync speed was so low, the backup filled the link and high latency (blue) ensued.
**At
*Looking at the times on the graph gave a clue to the end user what had happened. They had accidentally disconnected one of the wires of the phone line and surprisingly the FTTC was actually still in sync, logged in and passing traffic - just at low speeds.
*20:00 The wiring was repaired and the FTTC came back in to sync at the usual high rates.
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