EPC/CON or C/CON concentrator hangs at "P2" and doesn't finish booting to AC

Symptom:

EPC/CON or C/CON concentrator hangs at "P2" and does not finish booting to AC.

Cause:

• Timing is set incorrectly on either the host adapter, the concentrator (or the modem (CSU/DSU) if a remote concentrator).
• The cable or the phone line is faulty.
• The last concentrator on the chain is not terminated.
• The host adapter is malfunctioning.

Solutions:

• Make sure the timing settings match on the host adapter, the concentrator, and the modem (CSU/DSU).
• Verify that the cables and/or the phone lines are good.
• Terminate the last concentrator on the chain.
• Run the appropriate diagnostics to verify the host adapter is functioning properly.