Chapter 2: Service Error Codes
##1128 [ TX/RX ] CCU is faulty
Cause
• CCU (hardware) is faulty.
##1129 [ TX/RX ] ISDN control circuit is faulty
Cause
• ISDN control circuit is faulty.
Remedy
• Turn off and then on the power.
• Replace the PCB that includes the CCU.
Remedy
• Turn off and then on the power.
• Replace the PCB that includes the ISDN
control circuit.
2-172