Small rural school served by a single T1 circuit. Years of mostly-OK operation. Recently, link quality diminished. Monitoring shows input errors, CRC errors, and aborts on both sides of the circuit. Logs show link flaps several times a day.
Several intrusive tests by AT&T show a "clean" link and blame our CSU. Our gear is older Cisco ISRs, but show no sign of trouble that I can see.
Where do I go from here?
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