User's Manual

Base Station Menu
BreezeMAX Modular Base Station System Manual 107
4.5.2.7.1.2 External 16 MHz Clock
The 16 MHz clock source is used for generation of all main clocking signals in the
system, including the internal 1PPS clock. Using an external, accurate 16 MHz
clock source will enable better hold-over of the 1PPS clock upon temporary loss
(or reduced reliability when receiving less than 4 satellites) of the external 1PPS
clock. This will allow a longer time of continued operation before appearance of
interferences due to clock drifts among Base Stations.
The available options are Enable (use external 16 MHz clock source) and Disable
(use internal 16 MHz clock source).
The default is Disable
In the current release, external 16 MHz clock from the GPS Adapter is not
available.
4.5.2.7.2 Chain
Future versions of BreezeMAX will enable chaining of co-located Base Stations to
fully support intra-site synchronization. When two or more Base Stations are
chained, all clocks and additional parameters required to ensure fully
synchronized operation of all sectors are sent from the Master Base Station to
other Base Stations. The Chain menu includes parameters that must be shared
by all Base Stations belonging to the same chain, where most of them should be
configured only in the Master Base Station (they will be read-only in other chained
Base Stations).
In the current release chaining is not supported yet and all Base Stations are
configured as Master Base Stations.
The Chain menu includes the following:
4.5.2.7.2.1 Chain Number
In future releases, when chaining will be fully supported, the Chain Number will
be used as a unique identifier of a chain. All Base Stations belonging to the same
chain should be configured with the same Chain Number. The Chain Number can
be used by a central management system to guarantee that certain limitations are
met: in each chain, one, and only one Base Station should be defined as Master.
Only one Base Station can be defined as Redundant (backup to the Master).
The range is from 1 to 1500.
The default is 0, indicating that a Chain Number is not configured yet. A valid
Chain Number must be configured, and this number must be unique in the
system to properly support future implementation of chaining.