Nokia MetroHopper User Manual page 45

Loop to interface
Severity: Major
Fault code: 21
Meaning: 1) Loopback to radio path
2) Signal looped back to BTS
3) Loopback to Flexbus
Instructions:
Cancelling:
Loss of CRC multiframe alignment
Severity: Critical
Fault code: 86
Meaning: Frame alignment lost (CRC in use)
Instructions:
Cancelling:
Loss of frame alignment
Severity: Critical
Fault code: 81
Meaning: 1) RX frame lock lost / FEC header error / Frame alignment lost
2) Frame alignment lost (CRC not in use)
Instructions:
Cancelling:
30 (42) © Nokia Networks Oy
Unit/SB type:
1) Flexbus
2) 2M LIF
3) BFI channel
Consequence:
Unit/SB type: 2M LIF
Consequence:
Unit/SB type:
1) Flexbus
2) 2M LIF
Consequence:
Commissioning and Maintenance
DN99611394
Issue 2-0 en