We have a 81C that has several buildings on it. We have noticed a problem a problem with the cable plant to one particular building. Don't believe it is a distance problem. Other building are further away. What happens is that a digital phone will stop working. Sometimes it can be has simple as lifting the pair and punching it back down and the phone will work again. Or change pairs and it will work. Thought it might be a cable problem. Pulled in a new 200 pair about 700 feet. We did reuse the same protector block.we have changed out some of the protectors but we still have phones going down on the system to this building.it' random. Grounding is good cable is in a tunnel between buildings so it is protected. Usually if I have a protector problem you can tell its bad and just replace it. How can just lifting and repunching get the phone to work but later we will have a different phone go down. It's almost like a capacitance issue. But it's so random.
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