Appendix D: Serial Port and Telnet Commands
External Time Reference Commands
SmartBits 600x/6000x Installation Guide | 127
ETR MODE command responses:
• MASTER – No GPS/CDMA is detected, no other chassis are detected on the chassis’
Expansion IN connection.
• SLAVE – No GPS/CDMA is detected, another SmartBits chassis is detected on the
chassis Expansion IN connection.
• GPS MASTER – GPS/CDMA is detected, no other chassis are detected on the
chassis’ Expansion IN connection.
• INVALID GPS SLAVE – GPS/CDMA is detected, and another SmartBits chassis is
detected on the chassis’ Expansion IN connection. This is an invalid configuration.
ETR STATUS – Returns a summary of the operational status of the GPS/CDMA receiver.
A binary version of this command exists, and is indirectly supported by SmartLibrary.
ETR STATUS command responses:
• “GPS OK” – GPS/CDMA is detected, and appears to be operational (ready for use).
• “GPS NOT READY” – GPS/CDMA is either not detected or appears to not be
operational (not ready for use).
• “GPS NOT CONNECTED” – GPS/CDMA is not connected or not connected
correctly.
ETR FFOM [FFOM] – Allows the user to display or change the threshold for the
Frequency Figure of Merit (FFOM), by which the firmware determines the GPS/CDMA’s
readiness. This command was added to allow specialized testing even while the GPS/
CDMA is operating in a degraded state, such as holdover mode.
More specifically, this command sets the maximum acceptable FFOM. As described in
Figure D-2 on page 120, this value indicates the accuracy of the UTC time reference and
related 1 Hz (i.e., 1 PPS) and 10 MHz output signals. A value of 0 indicates a stable output
synchronized to the GPS satellites or CDMA cell site transmitter, and is the normal
requirement for the chassis SYNC operation. A value of 2 indicates that the GPS/CDMA
receiver is not currently receiving sufficient satellite information to provide an accurate
time reference; but is providing a secondary time reference utilizing its internal oscillator
and the last known synchronization. A value of 3 indicates that the receiver is not
synchronized and should not be used. The value of 1 indicates that the ETR is receiving
some timing information, and is in the process of synchronizing its internal phase-locked
loop (PLL) to the time reference. For more details refer to the specific manual for the time
reference being used.
The SmartBits chassis checks the reported value for the FFOM against the limiting value
set by this command when determining if the GPS’s time is usable. The default value on
reset is 0.
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