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I am working some oplder tech on this one. I am getting random modem retrains. I am getting CTS traps coming in. I have tested line for days and have found no trouble with Telco lines in between. I have looked for mismatches across the lines. The design is a T-1 across network then muxed down to a 64k channel then muxed to a 2.4k. Yes Like I said old. Has anyone seen this issue.