User's Manual

Table Of Contents
Installing the GPS Adapter
BreezeMAX Modular Base Station System Manual 67
2.4.2 The GPS Adapter
The GPS Adapter connects the different GPS units to the NPU, adapting the
different interfaces. Future versions may include an internal GPS module that will
allow an all-in-one low-cost solution. A future optional addition of OCXO in the
GPS Adapter box may provide an improved hold over solution when the GPS is not
synchronized. The GPS Adapter is powered by 12 VDC supplied by the NPU. The
GPS Adapter is installed in a 1U high panel (the same panel that is used for the
ODU Power Feeders).
Figure 2-14: GPS Adapter Front Panel
Figure 2-15: GPS Adapter Rear Panel
Table 2-15: GPS Adapter Connectors
Name Connector Functionality
BASE STATION
INTERFACE
15 pin D-Type jack
1PPS and 16MHz synchronization signals (LVDS interface) to the
NPU
Power (12 VDC) from the NPU
Serial control signals (RS-442 interface) from the NPU
CMD 9 pin D-Type jack Serial control signals (RS-232 interface) to the Indoor GPS Receiver.
1PPS IN BNC jack 1PPS signal (TTL levels) from Indoor GPS Receiver