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RedMAX Administration and Maintenance Guide
Redline Communications Inc. Confidential and Proprietary
Local Synchronization versus GPS Synchronization
Each RedMAX sector controller has synchronization ports to send and receive clock
synchronization pulses. When using the sector controller’s internal synchronization
feature, one sector controller is designated as the master and generates the clocking
pulses to synchronize the operation of up to five slave sector controllers, thus providing
full 360-degree coverage. All slave sector controllers monitor these clocking pulses and
synchronize their transmission and receive periods.
If your co-located sector controllers are at an isolated location, at which there are no
adjacent cells belonging to the same network, then you can use local synchronization and
a GPS clock is not required. Refer to the RedMAX Base Station Installation Guidelines for
details of installation and initial configuration of local synchronization.
If your network consists of geographically co-located cells, then an external GPS clock is
required at each site. As with local synchronization, one sector controller is designated as
the master. The master now receives the GPS clocking pulses and then uses this to
synchronize the operation of up to five slave sector controllers. Refer to the RedMAX Base
Station Installation Guidelines and Redline RedMAX GPS Clock User Manual for details of
installation and initial configuration of GPS synchronization.
Verifying Network Synchronization
Use the Web interface or the CLI to view the event log in order to confirm the correct
operation of each sector controller. See “Monitoring System Event Logs” on page 2-6.
Additionally, Appendix B, “AN100U/UX Event Log Messages” lists messages that will
appear in the event log. Messages specific to both local and GPS synchronization are
listed in “Synchronization Messages (See also Appendix D, “Synchronization Event Log
Messages”” on page B-15.
Changing from Local to GPS Synchronization
The following procedure is applicable to sites consisting of two or more sector controllers
that are already operating with local synchronization. Please refer to the RedMAX GPS
Clock User Manual for detailed information on correct installation and cabling of the
required hardware.
Note
This procedure is service impacting and should only be performed during a
scheduled maintenance window.
To minimize the service impact and ensure successful switch over from local to GPS
synchronization, you must follow the procedure in the exact order listed below.