Vanu Inc. 0PW1C0010 User Manual
Vanu Anywave BSS Operator Guide — DRAFT
2.2
GPS Timing Source
The Vanu Anywave System uses a Brandywine GPS4 to provide a precision time source for the BSS
system.
system.
Figure 2.2: GPS4 Timing Source Connections
The GPS unit provides three important sources of data for BSS functionality:
• A 10 MHz signal
• A 1 Hz or Pulse-Per-Second (PPS) signal
• A precise value for time of day
The 10 MHz clock is used as both a frequency reference and a sub-second time reference by the RF Front
End.
End.
The 1 Hz signal is used to synchronize the time alignment at BTSs across the network, both for proper
hardware alignment and minimization of neighbor BTS interference.
hardware alignment and minimization of neighbor BTS interference.
The time of day value is obtained via a serial connection, and is used to ensure that timestamps are valid
and consistent throughout the network.
and consistent throughout the network.
Note:
The GPS unit can also be used to provide location information, but the data is not used by the Anywave
System.
The GPS unit can also be used to provide location information, but the data is not used by the Anywave
System.
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