Symmetricom Z3801A, User Manual

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In This Guide
viii User Guide
Description of the Z3801A GPS Receiver
The Z3801A GPS Receiver provides highly accurate time and
frequency outputs that can be used for synchronizing CDMA Cellular
Land Network wireless base stations.
The Receiver provides highly accurate timing. If a satellite signal is
lost, the Receiver automatically switches to holdover mode, which
ensures system synchronization for up to 24 hours with reduced
accuracy.
The Z3801A has the following rear-panel Input/Output connectors:
• an I/O Port 1 25-pin female rectangular D subminiature connector
(This connector provides two 1 PPS time outputs, two 10 MHz
frequency outputs, and an RS-422 serial interface port).
• 10 MHz output BNC connector
• an Antenna N-type connector
• Power input jack
The front panel contains six Light-Emitting-Diode (LED) indicators to
indicate that power has been applied (
Power
), the module has tracked
and locked on to one or more GPS satellites (
GPS Lock
), the GPS system
is operating in holdover mode (
Holdover
), and an error or invalid
condition exists due to system fault or reduced accuracy of the outputs
(
Alarm
), and two LEDs illuminated under user-defined conditions
(
Enabled , Active
).
The Z3801A has no front panel display or keypad entry. Information is
remotely entered into and retrieved from the Z3801A using customer-
supplied DCE (Digital Communications Equipment) connected to the
rear-panel 25-pin RS-422 serial interface port.