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to all boards. This data together with PCM timing from the back plane is
used to secure the air frame synchronization.
Synchronization ring has a possibility to distribute PCM timing between
the different media gateways containing ELU31 boards. Synchronization
ring master board distributes the PCM timing through the ring. Each ring
member can be set as gateway synchronization source.
Accuracy on the delay values are critical. ACDM shall be used, to auto-
matic calculate the delay values on the synchronization ring.
The customer installation will be covered by a number of base stations.
Each base station is surrounded by other base stations, together forming
the coverage area. The PPs are free to roam throughout this area, even
during a call. The call will be switched from one base station to another
unnoticeable, see chapter 1.3 Limitations on page 6. The users can
roam their PPs and make and receive calls anywhere in the radio
coverage area unless the PPs are turned off.
