Test patterns over leased line.

[cheriton]

I have had a problem whereby I ber tested a leased line to a remote loop & it worked fine with most test patterns.However certain test patterns produced errors.The problem was eventually solved when the PTT replaced a section of the leased line that was a radio link.I would have thought that a physical layer problem would have caused errors no matter what the test pattern was.
Can anyone explain this?

 

[kvgb]

That is a physical layer problem and I'm guessing that the pattern that produced the errors was all 1 or 0 or some other stress test pattern. This problem isusually associated with repeaters and there are repeaters in radio link.

Keith