The problem can be caused by too many active lines using the same input/output processor (IOP) card or by setting the line speed too high.

Perform the following to find which active lines use the same IOP, and to correct the problem:

1. Vary off the failing line using the VRYCFG command.
2. Vary the line on again, with the reset option of the VRYCFG command set to Yes. The active lines using that IOP will be displayed with their line speeds.
3. Determine if there are too many lines using the IOP, or if the line speeds are too high.
4. Correct the configuration as needed.

This ends the procedure.