User guide

Understanding Synchronization Link Characteristics
96
pmp-0229 (Mar 2013)
Advantage of GPS Sync
Although the embedded timing generation capability of the AP and BHM keeps a precise clock,
no trigger exists to start the clock at the same moment in each AP of a cluster. So, the individual
AP can synchronize communications between itself and registered SMs, but cannot synchronize
itself with other modules, except by GPS timing (shown in Figure 28).
Time
Figure 28: GPS timing throughout the network (FSK shown)
Passing Sync in a Single Hop
Network sync can be passed in a single hop in the following network designs:
• Design 1
o A CMM provides sync to a co-located AP.
o This AP sends the sync over the air to SMs.
• Design 2
o A CMM provides sync to a co-located BH timing master.
o This BH timing master sends the sync over the air to a BH timing slave.
Passing Sync in an Additional Hop
Network sync can be extended by one additional link in any of the following network designs: