Ceragon FA4800 - Figure 12-12 Secondary; System Operation Description

System Operation description Chapter 12
FA4800 User Manual Release 1.9.40 12-14
Figure 12-12: Secondary Link operating after the switch back to Primary
System Operation description
Normal operation
• TDM services are carried by the primary link
• The secondary link (equipment and air interface) is operating but not carrying user traffic
• TDM ports on the secondary IDUs are tri-state
Switching to backup
• Switching to secondary will occur in the following cases:
• Loss of the primary air interface due to sync loss
• Loss of the primary air interface due to failure of the receiver to acquire expected
TDM data during a period of 24ms
• Primary equipment power off (either ODU or IDU, local or remote)
• The switching result would be:
• TDM ports on the primary IDUs turn to tri-state
• TDM ports on the secondary IDUs become active
Backup operation • TDM services are carried by the secondary link
Switching back to
primary
• Switching back to primary will occur as soon as the Primary link is fully functional for 1
second