CS Classifications
CSs are assigned to any one of the following three classifications for implementing air synchronization:
CS Class
Description
Master CS1 (synchronization
source clock)
Generates clock signal.
Master CS2 (backup for
Master CS1)
Receives clock signal from Master CS1 (can also generate
clock signal if Master CS1 malfunctions).
Slave CS
Receives clock signal from other CSs.
Synchronization Hierarchy
Air synchronization has a hierarchical structure with a Master CS1 at the top. Therefore, it is necessary to
conduct the site survey with extreme care to ensure stable synchronization since one disruption of the radio
link could cause loss of service to a wide area.
Master CS1
(Master Clock Signal)
Master CS2
Slave CSs
Slave CS
Master CS1
(Master Clock Signal)
Master CS2
Slave CSs
Slave CS
Radio Link Loss
CSs stop working
Search Order (Primary/Secondary)
The search order used for synchronizing CSs must be set. If the CS cannot synchronize with the Primary CS
for some reason, it will try to synchronize with the Secondary CS.
CS Class
Primary CS
Secondary CS
Master CS1
None
None
Master CS2
Master CS1
None
Slave CS
Master CS1, Master CS2, or Slave
CS
Master CS1, Master CS2, Slave
CS, or None
For example, if synchronization is completely lost by malfunction of the Master CS etc., handover will not work
and ongoing calls will be disconnected after a while. In addition, new calls cannot be made or received.
Therefore, it is recommended to not only assign the Primary CS but also the Secondary CS as an alternative
source for synchronizing CSs.
54
Installation Guide
5 Appendix
